2D

Only active for BFC grid files. Switches back to normal 2-D plotting.

3D

Only active for BFC grid files. Activates 3-D plotting of grids. The program will prompt for a view-point. Once a data-element has been created, its view-point cannot be changed, as the 2-D to 3-D transformation is performed as the data is read in. All subsequent elements will have the same view-point, untill the next 3D or 2D command.

ALN,ALNX,ALNY

ALN [X or Y]

Takes the exponential of the x or y axis of all data elements. SCALE will give a correctly scaled plot.

ALOG,ALOGX,ALOGY

ALO[G] [X or Y]

Takes the anti-log of the x or y axis of all data elements. SCALE will give a correctly scaled plot.

AXES

AX[ES]

Alternately removes and replaces x and y axes. Default ON.

See also HELP on : BOX, FRAME, TICK, EQUAL, UNEQUAL, SCALE

BIG

BI[G]

Produces plots which, when reduced by 70% on a photocopier, will fit directly into a CHAM half-page report box. Default text uses size 2 characters. This is the default plot size.

BLB

BL[B]n [i] [j]

Plots data elements i - j using blobs of type n. If i & j are omitted, all elements in memory but not on the screen will be plotted. 'n' is an integer in the range 1 - 5, as follows:

           BLB1 = circle;
           BLB2 = square;
           BLB3 = diamond;
           BLB4 = '+';
           BLB5 = 'x'.

If n is omitted, 1 is assumed

BLOB

BL[OB] [i] [j]

Plots data elements i - j with circles at the data points. If i & j are omitted, all elements in memory but not on the screen will be plotted. Synonymous with BLB1.

BOX

BO[X]

Alternately removes and replaces the outer frame around the plot. Default ON.

CLEAR

CL[EAR]

Clears the screen, deletes all data elements from memory and deletes all text items ,levels and keys.

COLOUR

CO[LOUR][h] [i] [j]

Data elements i - j will be drawn with colour h, where h is the hexadecimal value of the required colour (ie 0-9,A-F). Colour 0 is the background colour, & colour 1 is the default plotting colour. Colour 2 is dark blue, colour F is full red, and the rest follow the spectrum. Not all terminals will support all the 16 colours. If the data elements are already on the screen, they will be redrawn in the same line type with the new colour. If the data elements are only in memory, they will be drawn with a solid line joining the data points (equivalent to PLOT). If i & j are omitted all data elements not yet on the screen will be drawn with the specified colour.

See also HELP on : COLOUR AXES, COLOUR BOX, COLOUR GRID, COLOUR LEVELS

COLOURAXES

CO[LOUR] A[XES] [i]

The axes will be drawn in colour i.

See also HELP on : COLOUR BOX, COLOUR GRID, COLOUR LEVELS, COLOUR

COLOURBOX

CO[LOUR] B[OX] [i]

The box around the plot will be drawn in colour i.

See also HELP on : COLOUR AXES, COLOUR GRID, COLOUR LEVELS, COLOUR

COLOURGRID

CO[LOUR] GR[ID] [i]

The grid will be drawn in colour i.

See also HELP on : COLOUR BOX, COLOUR AXES, COLOUR LEVELS, COLOUR

COLOURLEVE

CO[LOUR] L[EVEL] [i]

Subsequent levels will be drawn in colour i.

See also HELP on : COLOUR BOX, COLOUR GRID, COLOUR AXES, COLOUR

DATA

DA[TA] [n]

Creates a new data element by reading data from file number n. Only need to specify n if more than one file attached. Program response depends on file type. If the response is known, it can be specified together with DATA.

Type 1 - PLOT file : Response asks for item number on file.

eg DATA 1 1 - plots item 1 from file 1.

Type 2 - Table file. Response asks for headings of X & Y columns.

eg DATA 1 xcol ycol plots ycol vs xcol from file 1

Type 3,5,7 - PHOENICS Restart file . Response asks for variable name and up to 2 coordinate locations. Plot will be of variable against unspecified coordinate. A range for the unspecified coordinate may also be given.

eg DATA 1 P1 X 1 Y 1 plots P1 from file 1 at IX=1,IY=1

vs Z for IZ=1-NZ

DATA 2 P1 X 3 Y 4 Z 5 12 plots P1 from file 2 at IX=3,

IY=4 vs Z for IZ=5-12

Type 4,6,8 - BFC grid file : Response asks for limits of grid to be plotted.

eg DATA 1;X 1;2 4 1 M plots the grid from file 1 at IX=1

for IY=2-4 and IZ=1,Maximum.

In all cases, the limits of grid can be specified as M for Maximum.

See also HELP on : DATA CLEAR, DATA DELETE, CLEAR, PLOT

DATACLEA

DA[TA] CL[EAR]

Deletes all data elements. Equivalent to CLEAR, but text, levels, keys and axis scaling retained.

See also HELP on : DATA, DATA DELETE, CLEAR, SCREEN

DATADELE

DA[TA] DE[LETE]

Deletes last data element which was added by a DATA command. Levels text and keys unaffected.

DIGITISE

DIG[ITISE]

The cursor can be used to obtain the x and y coordinates of any series of points on the screen. These will be stored in memory as the next data set, and can thus be plotted as normal. The points can be saved on a disc file by using the ELEMENT SAVE command.

DIVIDE,DIVIDEX,DIVIDEY

DI[VIDE] [X or Y] [a] [i] [j]

Divide x- or y- coordinates of data elements i - j by ammount a. Amount and element range will be prompted for. At any stage '/' forces return to OPTION?.

See also HELP on : MULTIPLY X, MULTIPLY Y, SHIFT X, SHIFT Y

DOT

DO[T]n [i] [j]

Plots data elements i - j using dashed lines of type n. If i & j are omitted all elements in memory but not on the screen will be plotted. 'n' is an integer in the range 1 - 5 as follows :

             DOT1 = short dash;
             DOT2 = dash-dot;
             DOT3 = medium dash;
             DOT4 = long dash;
             DOT5 = very long dash.

If n is omitted, DOT1 is assumed.

DUMP

DU[MP]

Generate a screen dump on a hard-copy device if one is available. This function may not be implemented on all installations.

ELEMENTADD

EL[EMENT] AD[D] {dir} {i j}

The X (or Y , as specified by 'dir') coordinate of element j will be added to the X (or Y) coordinate of element i, and a new element will be generated. The Y (or X) coordinate will be that of element i. All arguments will be prompted for if not supplied.

See also HELP on : ELEMENT SUBTRACT, ELEMENT MULTIPLY, ELEMENT DIVIDE, ELEMENT MAKE

ELEMENTDIVI

EL[EMENT] DI[VIDE] {dir} {i j}

The X (or Y , as specified by 'dir') coordinate of element j will be divided by the X (or Y) coordinate of element i, and a new element will be generated. The Y (or X) coordinate will be that of element i. All arguments will be prompted for if not supplied.

See also HELP on : ELEMENT SUBTRACT, ELEMENT MULTIPLY, ELEMENT ADD, ELEMENT MAKE

ELEMENTLIST

EL[EMENT] L[IST]

A list of data elements currently in memory, their status (on/off), associated line-type,file and contents is provided.

See also HELP on : ELEMENT ON, ELEMENT OFF, ELEMENT SAVE

ELEMENTMAKE

EL[EMENT] MA[KE] {dir} {n} {i j}

This command makes a new data element by choosing a constant value of one coordinate, and then taking the values of the other coordinate at that location from a range of existing data elements. These values will be stored as the y axis, and the x axis will be numbered from 1 to the number of elements used. Thus ;

EL MA X 3 1 4

will take the y values from elements 1 through 4 inclusive, at the 3rd x location and store them as the new y. The x values will be 1,2,3,4. This feature is usefull when one has a number of data sets for different points in time, and one wishes to generate a time- history at a specific location. The element range i j may be specified as ALL. All arguments will be prompted for if not supplied.

See also HELP on : ELEMENT SUBTRACT, ELEMENT MULTIPLY, ELEMENT ADD, ELEMENT DIVIDE

ELEMENTMULT

EL[EMENT] MU[LTIPLY] {dir} {i j}

The X (or Y , as specified by 'dir') coordinate of element j will be multiplied by the X (or Y) coordinate of element i, and a new element will be generated. The Y (or X) coordinate will be that of element i. All arguments will be prompted for if not supplied.

See also HELP on : ELEMENT SUBTRACT, ELEMENT ADD, ELEMENT DIVIDE, ELEMENT MAKE

ELEMENTOFF

EL[EMENT] OF[F] {i j}

Data elements in the range i to j are switched off. They will not appear on the screen after a REDRAW or SCALE command. If j is omitted, only element i is affected.

See also HELP on : ELEMENT ON, ELEMENT LIST, ELEMENT SAVE

ELEMENTON

EL[EMENT] ON {i j}

Data elements in the range i to j are switched on. They will appear on the screen after a REDRAW or SCALE command. If j is omitted, only element i is affected.

See also HELP on : ELEMENT OFF, ELEMENT LIST, ELEMENT SAVE

ELEMENTSAVE

EL[EMENT] S[AVE] {i}

Data element i is saved to a disc file. This will be an AUTOPLOT table file (type 2). The program will prompt for the column headings. The element number to be saved, and the name of the disc file will be prompted for as necessary. The default file name is ELESAV.

See also HELP on : ELEMENT ON, ELEMENT OFF, ELEMENT LIST

ELEMENTSUBT

EL[EMENT] SUB[TRACT] {dir} {i j}

The X (or Y , as specified by 'dir') coordinate of element j will be subtracted from the X (or Y) coordinate of element i, and a new element will be generated. The Y (or X) coordinate will be that of element i. All arguments will be prompted for if not supplied.

See also HELP on : ELEMENT ADD, ELEMENT MULTIPLY, ELEMENT DIVIDE, ELEMENT MAKE

END,STOP,QUIT

EN[D] or QU[IT] or ST[OP]

Terminate session.

EQUAL

EQ[UAL]

Enters "equal mode", in which plots are drawn so that both axes are scaled equally. This is the default for BFC grid file plots.

FILE

FI[LE]

Closes all current file attachments, and allows new file names to be specified. All current data items, text items, levels and keys are lost. Equivalent to entering program for first time. Not active if files are pre-assigned

See also HELP on : FILE ADD, FILE REPLACE, SHOW FILES

FILEADD

FI[LE] A[DD]

Allows further files to be attached. All existing items kept. Not active if files are pre-assigned

See also HELP on : FILE, FILE REPLACE, SHOW FILES

FILEREPL

FI[LE] R[EPLACE] [n]

Allows file number n to be changed. If n is unspecified, the program will prompt for it. Not active if files are pre-assigned

See also HELP on : FILE, FILE ADD, SHOW FILES

FRAME

FR[AME]

Axes will form complete frame around plot. Axis markings will appear on the inside of all four sides. Return to normal axes by repeating FRAME. (Defaulted ON).

FULL

FU[LL]

Produces a plot which fills the screen. Default text size is size 2.

GENERAL

GENERAL INFORMATION

Data are introduced into the program by means of the 'DATA n' command, where 'n' denotes the number of the file containing the data. This can then be displayed on the screen by using the 'PLOT', 'DOTn', 'BLBn' or 'COLh' commands. These will cause the line to be drawn solid, dashed, symboled or coloured. The axes will be scaled so that all data items in memory will fit on the plot. Subsequent 'DATA' commands may introduce points which lie outside the current range. The 'SCALE' command will re-scale both axes to encompass the new data. It may thus be better to enter several 'DATA' commands before plotting, as fewer redraws will be required. The plot can be labelled using the 'TEXT' and 'KEY' commands. At any time, a clean picture can be recovered by the 'REDRAW' command. The finished plot can be stored to a PHOTON-format 'save' file by the 'SAVE' command. Data elements can be cleared away for the next plot by means of the 'CLEAR' command. At any point, entering '/' will return control to the 'Command?' level. Many commands can be entered on one line, by use ';' as a delimiter.

More detailed help may be obtained on : DATA, PLOT, DOT, BLB, COLOUR, SCALE, TEXT, KEY, CLEAR

GRID

GRI[D]

Causes a dashed grid to be drawn on the plot, starting from the axis tick marks. The grid is removed by another GRID command.

GRIDDEFI

GRI[D] D[EFINE] [a b]

Causes a dashed grid to be drawn on the plot, using a as the x-interval and b as the y-interval. If a & b are unspecified, the program will prompt for them. The grid is removed by another GRID command. For a logarithmic scale, the grid is drawn at the subsidiary axis marks.

GROUPADD

GRO[UP] A[DD] [i]

This command allows new TEXT and/or KEY items to be added to the existing i'th GROUP.

See also HELP on : GROUP MAKE, GROUP MOVE, GROUP LIST, GROUP CLEAR, GROUP DELETE

GROUPCLEA

GRO[UP] CL[EAR]

This command clears all GROUP associations currently active.

See also HELP on : GROUP MAKE, GROUP ADD, GROUP MOVE, GROUP LIST, GROUP DELETE

GROUPDELE

GRO[UP] DE[LETE]

This command deletes the last GROUP to be made.

See also HELP on : GROUP MAKE, GROUP ADD, GROUP MOVE, GROUP LIST, GROUP CLEAR

GROUPLIST

GRO[UP] L[IST]

This command generates a list of the contents of the currently active groups.

See also HELP on : GROUP MAKE, GROUP ADD, GROUP MOVE, GROUP CLEAR, GROUP DELETE

GROUPMAKE,GROUP

GRO[UP] MA[KE]

This command allows any number of TEXT and/or KEY items to be grouped. The group can then be moved about the screen as a single unit. Up to 10 groups are allowed. Each GROUP MAKE command makes a new group.

See also HELP on : GROUP ADD, GROUP MOVE, GROUP LIST, GROUP CLEAR, GROUP DELETE

GROUPMOVE

GRO[UP] MO[VE] [i]

This command allows GROUP i to be moved to a new position on the screen. The reference point of the group will be marked with '_'. Move the cursor to the desired location of the reference point, then press any key to place the group. 'C' may be used for repeated moves.

See also HELP on : GROUP MAKE, GROUP ADD, GROUP LIST, GROUP CLEAR, GROUP DELETE

HELP,?

H[ELP] [command] or [command] ?

Provides information on the specified command. If no command is specified, a list of all available commands is given.

KEY

K[EY]

Allows the user to draw lines in any of the recognized line types, and to draw polygons of arbitrary shapes. Place the cursor at the desired beginning of the line or polygon, then mark this point using one of the following keys :

       A     : solid line
       B - F : dot1 - dot5
       G - K : blb1 - blb5 (three blobs will be drawn)
       P     : to change colour
       S     : to start polygon definition
       T     : to switch to TEXT mode
       X     : to exit KEY mode

Now move the cursor to the end of the line, and mark it with one of the following keys :

       C     : to continue the line.
       O     : to close polygon and fill with current colour.

Any other key to finish the line.

If C has been used, the next point marked by the cursor is the next point along the line; otherwise it marks the beginning of a new line. In this case the line type must be designated again by marking the point with A - K. For polygons, C is used to mark subsequent points, then O to close and fill. A new fill colour must be loaded (using P) before starting the polygon definition.

See also HELP on : KEY CLEAR, KEY COLOUR, KEY DELETE, KEY MOVE KEY LIST, KEY SIZE, KEY REPLACE, TEXT

KEYCOLO

K[EY] CO[LOUR] [i] [n]

Changes colour of line i from current colour to colour n. The program will prompt for i and n if these are omitted.

See also HELP on : KEY, KEY CLEAR, KEY DELETE, KEY MOVE KEY LIST, KEY REPLACE

KEYKEEP

K[EY] K[EEP]

Keys will not be cleared from memory by a CLEAR command, but will be retained for the next plot. GROUP associations will also be kept.

KEYLIST

K[EY] L[IST]

List the current line types.

See also HELP on : KEY, KEY CLEAR, KEY COLOUR, KEY DELETE KEY MOVE, KEY REPLACE

KEYMOVE

K[EY] M[OVE] [i]

Moves i'th line to the new position located by cursor. 'C' can be used to locate the cursor for repeated moves.The program will prompt for i if required. 'N' can be used to request the next key to be moved. If a polygon is to be moved, then all its component keys should be GROUPed, and the group moved as a whole. Moving individual sides of a polygon is allowed. Use the REDRAW command for a 'clean' plot.

See also HELP on : KEY, KEY CLEAR, KEY COLOUR, KEY DELETE KEY LIST, KEY REPLACE, GROUP MAKE, GROUP MOVE

KEYREAD

K[EY] REA[D]

Keys will be read from a file, generated by a previous KEY SAVE command. They will be added to the current keys. REDRAW will plot the new keys. The program will prompt for the name of the file to be read. The default file name is KEYSAV.

See also HELP on : KEY, KEY CLEAR, KEY COLOUR, KEY DELETE KEY MOVE, KEY REPLACE, KEY LIST, KEY SAVE

KEYREPL

K[EY] R[EPLACE] [i]

Changes the line type of the i'th line. The program will prompt for i if required, and also the new line type. Use the REDRAW command for a 'clean' plot.

See also HELP on : KEY, KEY CLEAR, KEY COLOUR, KEY DELETE KEY LIST, KEY MOVE

KEYSAVE

K[EY] SA[VE]

All current keys will be saved to a file. The program will prompt for the file name. The default file name is KEYSAV.

See also HELP on : KEY, KEY CLEAR, KEY COLOUR, KEY DELETE KEY MOVE, KEY REPLACE, KEY LIST, KEY READ

LEVEL,LEVELX, LEVELY

LE[VEL] [X or Y] [a]

Draws a line of constant x or y with a value a. The program will prompt for unspecified quantities.

See also HELP on : LEVEL CLEAR, LEVEL DELETE

LEVELCLEA

LE[VEL] CL[EAR]

Clears all levels from memory. REDRAW for a 'clean' plot.

See also HELP on : LEVEL X, LEVEL Y, LEVEL DELETE, REDRAW

LEVELDELE

LE[VEL] DE[LETE]

Deletes last level entered. REDRAW for a 'clean' plot.

See also HELP on : LEVEL X, LEVEL Y, LEVEL CLEAR, REDRAW

LEVELKEEP

LE[VEL] K[EEP]

Levels will not be cleared from memory by a CLEAR command, but will be retained for the next plot.

See also HELP on : LEVEL X, LEVEL Y, LEVEL CLEAR, LEVEL DELETE

LITTLE

LIT[TLE]

Produces plots which will copy directly into a CHAM half-page report box. Default text size is size 4

LN,LNX,LNY

LN [X or Y]

Changes x- or y- axis to a natural log scale. Repeated use of the command will continue taking logs. Negative values are trapped to 1.0E-6, and will not be recovered on return to linear scale. The plot will be redrawn with the correct axis scaling using the SCALE command. ALN reverses the process.

LOG,LOGX,LOGY

LO[G] [X or Y]

Changes x- or y- axis to log base 10 scale. Repeated use of the command will continue taking logs. Negative values are trapped to 1.0E-6, and will not be recovered on return to linear scale. The plot will be redrawn with the correct axis scaling using the SCALE command. ALOG reverses the process.

LOGO

The CHAM logo will alternately appear and disappear from the bottom right-hand corner of the plot. The location of the logo can be changed with LOGO MOVE, and its size with LOGO SCALE.

MAGNIFY

MA[GNIFY] [f]

The plot will be magnified by the factor 'f'. The cursor is used to locate the required centre of magnification. A factor of 0.0 will return to the original scaling. A factor of 1.0 can be used to move the centre of the plot. Any key can be used to place the cursor, except X which will abandon the magnification.

See also HELP on : SCALE, SCALE X, SCALE Y

MULTIPLY,MULTIPLYX,MULTIPLYY

MU[LTIPLY] [X or Y] [a] [i] [j]

Will multiply x- or y- coordinate of data elements i - j by amount a. If a, i or j are unspecified, the program will prompt. The plot can be rescaled using the SCALE command.

See also HELP on : DIVIDE X, DIVIDE Y, SHIFT X, SHIFT Y, SCALE

NORMAL,NORMALX,NORMALY

NO[RMAL] [X or Y] {i j}

Data elements i-j will have the x and/or y axes normalized between 0.0 - 1.0. SCALE will give a correctly scaled plot.

PAGE

PAG[E]

Produces plots which copy directly into a CHAM full-page report box. The default text size is size 4.

PANEL

PAN[EL]

The plot will be redrawn in CHAM report panel format.

See also HELP on SLIDE, BIG, FULL, LITTLE, PAGE

PAUSE

PAU[SE]

Pauses the program. Press RETURN to continue.

PLOT

PL[OT] [i] [j]

Plot data elements i - j using a solid line to join the data points. If i & j are unspecified, all data elements in memory but not on the screen will be plotted.

POINTS

PO[INTS]

Command only active for PHOENICS restart files. Forces plotting of all variables (including scalars) at cell faces. Return to cell-centre/cell-face operation by repeating POINTS.

POWER,POWERX,POWERY

POW[ER] {dir} {f} {i j}

The X (or Y, as specified by 'dir') coordinates of elements i-j will be raised to the power f. SCALE will redraw the plot correctly scaled to the new values.

See also HELP on : SHIFT, MULTIPLY, DIVIDE

RECIPROCAL,RECIPROCALX,RECIPROCALY

REC[IPROCAL] [X or Y] {i j}

Data elements i-j will have the reciprocal taken of the X or Y values. SCALE will give a correctly scaled plot.

REDRAW

R[EDRAW] [i] [j]

Clear the screen and redraw data elements i - j only. If i and j are unspecified, the plot will be redrawn exactly as it was. Any items deleted or cleared will not be redrawn.

SAVE

SA[VE] {i}

Saves the current picture in PHOTON save format.

SCALE

SCA[LE]

Clear the screen and redraw the plot with both axes automatically rescaled to encompass all data elements in memory, whether on the screen or not. Essential after LOG X or LOG Y commands, and nearly always required after DIVIDE, MULTIPLY and SHIFT commands. Text and key items will stay in the same place on the screen. Any items deleted or cleared will not be redrawn.

See also HELP on : SCALE X, SCALE Y, SCALE ELEMENT

SCALEX,SCALEY

SCA[LE] X or Y [a b]

Clear the screen and redraw the plot with the x- or y-axis scaled between a and b. If a and b are omitted, the program will prompt. For logarithmic axes, the axis will be scaled within powers of ten which just encompass the specified range. Text and key items will stay in the same place omn the screen.

SCREEN

SCR[EEN]

Clear the screen and delete all levels, text and keys. The data elements remain in memory, but the association with line type and colour is lost. Data elements can be restored using the PLOT, BLB or DOT commands.

See also HELP on : CLEAR, PLOT, BLOB, BLB, DOT

SENDP

SE[NDP]

Sends the current picture to a pltting device if one is available.

SHIFT,SHIFTX,SHIFTY

SH[IFT] [X or Y] [a] [i] [j]

A constant increment a is added to the x- or y- coordinates of data elements i - j. If these are omitted,the program will prompt.

See also HELP on : DIVIDE X, DIVIDE Y, MULTIPLY X, MULTIPLY Y

SHOW,SHOWGRID,SHOWVARI

SHO[W] {GRI[D] or V[ARIABLES]} [n]

Lists contents of file number n. Program will prompt as required.

Type 1 - data item headings

Type 2 - x & y column headins

Type 3,5,7 - grid locations or variables stored

Type 4,6,8 - settings of NX,NY and NZ

See also HELP on : SHOW ELEMENTS, SHOW FILES, SHOW KEYS SHOW TEXT, SHOW GROUPS

SHOWELEM

SHO[W] E[ELEMENTS]

Gives a list of current data elements in memory entered using the DATA command.

See also HELP on : SHOW, SHOW FILES, SHOW KEYS, SHOW TEXT SHOW GROUPS

SHOWFILE

SHO[W] F[ILES]

Gives list of attached files and their types. Grid file also listed for RESTART files that need BFC grid files.

See also HELP on : SHOW, SHOW ELEMENTS, SHOW KEYS, SHOW TEXT SHOW GROUPS

SHOWGROU

SHO[W] GRO[UPS]

Gives a list of the contents of currently active GROUPs.

See also HELP on : SHOW, SHOW FILES, SHOW KEYS, SHOW TEXT SHOW ELEMENTS

SHOWKEYS

SHO[W] K[EYS]

Gives list of current line types entered using KEY command.

See also HELP on : SHOW, SHOW ELEMENTS, SHOW FILES, SHOW TEXT SHOW GROUPS

SHOWTEXT

SHO[W] T[EXT]

Gives a list of current text items entered using TEXT command.

See also HELP on : SHOW, SHOW FILES, SHOW KEYS, SHOW ELEMENTS SHOW GROUPS

SLIDE

SLI[DE]

The plot will be redrawn in CHAM slide panel format.

See also HELP on SLIDE, BIG, FULL, LITTLE, PAGE

SWAP

SW[AP] [i] [j]

The x- any y- coordinates of data elements i - j will be reversed. If i & j are omitted, all elements in memory will be affected. If one of the axes is logarithmic, then all elements must be swapped. Data elements entered subsequently will not be affected. A SCALE command will frequently be required to rescale the axes to match the new data.

TEXT

T[EXT]

Allows the user to place labels on the picture. Type in a text string of up to 60 characters, ending with a 'RETURN' to activate the screen cursor. The cursor marks the left-hand end of the text string. When the cursor is in the right position, transfer the text to the screen by pressing one of the following keys :

      'C' or 'c' to continue with further text;
      'D' or 'd' to ignore current text string and continue;
      'F' or 'f' to colour-fill to colour specified in text string;
      'M' or 'm' to move last text to new postion and continue;
      'K' or 'k' to switch to KEY input mode;
      'P' or 'p' to switch to colour number specified in text string;
      'R' or 'r' to replace last text with new text and continue;
      'S' or 's' to change to text size specified in text string;
      'X' or 'x' to ignore current text and exit TEXT mode;
      'U' or 'u' to underline current text string and continue;

Any other character to exit TEXT mode.

See also HELP on : TEXT CLEAR, TEXT COLOUR, TEXT DELETE, TEXT MOVE TEXT LIST, TEXT SIZE, TEXT REPLACE, TEXT UNDERLINE, TEXT SAVE TEXT READ, TEXT ANGLE

TEXTANGL

T[EXT] AN[GLE] [i] [j]

If the terminal supports angled text, the angle of text item i will be changed to j degrees. 0 is horizontal,increasing anti- clockwise.

TEXTCLEA

T[EXT] CL[EAR]

Clear all text items from memory. Use REDRAW command to recover 'clean' plot.

See also HELP on : TEXT, TEXT COLOUR, TEXT DELETE, TEXT MOVE TEXT LIST, TEXT SIZE, TEXT REPLACE, TEXT UNDERLINE, TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTCOLO

T[EXT] CO[LOUR] [i] [n]

Changes colour of text string i from current colour to colour n. The program will prompt for i and n if these are omitted.

See also HELP on : TEXT, TEXT CLEAR, TEXT DELETE, TEXT MOVE TEXT LIST, TEXT SIZE, TEXT REPLACE, TEXT UNDERLINE, TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTDELE

T[EXT] D[ELETE]

Deletes last text string entered from memory. Use REDRAW command to obtain 'clean' plot.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT MOVE, TEXT LIST, TEXT SIZE, TEXT REPLACE, TEXT UNDERLINE, TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTKEEP

T[EXT] K[EEP]

Text will not be cleared from memory by a CLEAR command, but will be retained for the next plot. GROUP associations will also be kept.

TEXTLIST

T[EXT] L[IST]

List the current text items. The text items are also labelled on the screen. REDRAW will recover a 'clean' plot.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT UNDERLINE, TEXT MOVE, TEXT REPLACE, TEXT SIZE TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTMOVE

T[EXT] M[OVE] [i]

Moves i'th text string i to new position located by cursor. 'C' can be used to locate the cursor for repeated moves. The program will prompt for i if required. 'N' can be used to request the next text item to be moved. Use the REDRAW command for a 'clean' plot.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT LIST, TEXT SIZE, TEXT REPLACE, TEXT UNDERLINE, TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTREAD

T[EXT] REA[D]

Text items will be read from a file, generated by a previous TEXT SAVE command. They will be added to the current text items. REDRAW will plot the new text items. The program will prompt for the name of the file to be read. The default is TXTSAV.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT LIST, TEXT MOVE, TEXT REPLACE, TEXT SIZE, TEXT UNDERLINE TEXT SAVE, TEXT ANGLE

TEXTREPL

T[EXT] REP[LACE] [i]

Replaces i'th text string with new string. The program will prompt for i if required. Use the REDRAW command for a 'clean' plot.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT LIST, TEXT MOVE, TEXT SIZE, TEXT UNDERLINE, TEXT SAVE, TEXT READ, TEXT ANGLE

TEXTSAVE

T[EXT] SA[VE]

All current text items will be saved to a file. The program will prompt for the file name. The default is TXTSAV.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT LIST, TEXT MOVE, TEXT REPLACE, TEXT SIZE, TEXT UNDERLINE TEXT READ, TEXT ANGLE

TEXTUNDE

T[EXT] U[NDERLINE] [i]

Changes the underline switch for the i'th text item. The program will prompt for i if required. Use the REDRAW command for a 'clean' plot.

See also HELP on : TEXT, TEXT CLEAR, TEXT COLOUR, TEXT DELETE TEXT LIST, TEXT MOVE, TEXT REPLACE, TEXT SIZE, TEXT SAVE TEXT READ, TEXT ANGLE

TICK

TI[CK]

Cause axis tick marks to be drawn on other side of axes. Revert to original by repeating TICK.

UNEQUAL

UNE[QUAL]

Opposite of EQUAL. Forces return to normal axis scaling.

USE

US[E] {fname}

USE {file name} causes command input to be read from the specified file rather than from the terminal. Commands can be entered exactly as they would be from the terminal. Two extra facilities are available - the PAUSE command will cause a program halt until RETURN is pressed, and any line starting with * in column 1 will be treated as a comment line. Only one USE file can be in use at one time ... nesting of USE files is not allowed.