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7.2 Program flow commands

Below I show commands to control program flow, like, conditions, loops, define script arguments and so on. Other commands can be found in chapters MathGL core and Data processing.

MGL command: chdir 'path'

Changes the current directory to path.

MGL command: ask $N 'question'

Sets N-th script argument to answer which give the user on the question. Usually this show dialog with question where user can enter some text as answer. Here N is digit (0...9) or alpha (a...z).

MGL command: define $N smth

Sets N-th script argument to smth. Note, that smth is used as is (with ‘'’ symbols if present). Here N is digit (0...9) or alpha (a...z).

MGL command: define name smth

Create scalar variable name which have the numeric value of smth. Later you can use this variable as usual number. Here N is digit (0...9) or alpha (a...z).

MGL command: defchr $N smth

Sets N-th script argument to character with value evaluated from smth. Here N is digit (0...9) or alpha (a...z).

MGL command: defnum $N smth

Sets N-th script argument to number with value evaluated from smth. Here N is digit (0...9) or alpha (a...z).

MGL command: defpal $N smth

Sets N-th script argument to palette character at position evaluated from smth. Here N is digit (0...9) or alpha (a...z).

MGL command: call 'fname' [ARG1 ARG2 ... ARG9]

Executes function fname (or script if function is not found). Optional arguments will be passed to functions. See also func.

MGL command: func 'fname' [narg=0]

Define the function fname and number of required arguments. The arguments will be placed in script parameters $1, $2, ... $9. Note, you should stop script execution before function definition(s) by command stop. See also return.

MGL command: return

Return from the function. See also func.

MGL command: if dat 'cond'

Starts block which will be executed if dat satisfy to cond.

MGL command: if val

Starts block which will be executed if val is nonzero.

MGL command: elseif dat 'cond'

Starts block which will be executed if previous if or elseif is false and dat satisfy to cond.

MGL command: elseif val

Starts block which will be executed if previous if or elseif is false and val is nonzero.

MGL command: else

Starts block which will be executed if previous if or elseif is false.

MGL command: endif

Finishes if/elseif/else block.

MGL command: for $N v1 v2 [dv=1]

Starts cycle with $N-th argument changing from v1 to v2 with the step dv. Here N is digit (0...9) or alpha (a...z).

MGL command: for $N dat

Starts cycle with $N-th argument changing for dat values. Here N is digit (0...9) or alpha (a...z).

MGL command: next

Finishes for cycle.

MGL command: once val

The code between once on and once off will be executed only once. Useful for large data manipulation in programs like UDAV.

MGL command: stop

Terminate execution.

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