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MGL script language is rather simple. Each string is a command. First word of string is the name of command. Other words are command arguments. Command may have up to 1000 arguments (at least for now). Words are separated from each other by space or tabulation symbol. The upper or lower case of words is important, i.e. variables a and A are different variables. Symbol ‘#’ starts the comment (all characters after # will be ignored). The exception is situation when ‘#’ is a part of some string. Also options can be specified after symbol ‘;’. Symbol ‘:’ starts new command (like new line character) if it is not placed inside a string or inside brackets.
If string contain references to external parameters (substrings ‘$0’, ‘$1’ ... ‘$9’) or definitions (substrings ‘$a’, ‘$b’ ... ‘$z’) then before execution the values of parameter/definition will be substituted instead of reference. It allows to use the same MGL script for different parameters (file names, paths, condition and so on).
Argument can be a string, a variable (data arrays) or a number (scalars).
subdatacommand) as command argument. For example,
a(1,:,:)is second row,
a(:,2,:)is third column,
a(:,:,0)is first slice and so on. Also you can extract a part of array from m-th to n-th element by code
a('n*w^2/exp(t)')if names for data columns was specified (by
idsetcommand or in the file at string started with
tmp[i,j] = sqrt(dat[i,5,j]+1).
Temporary variables can not be used as 1st argument for commands which create (return) the data (like ‘new’, ‘read’, ‘hist’ and so on).
nan=#QNAN, pi=3.1415926..., on=1, off=0, :=-1are treated as number if they were not redefined by user. Variables with suffixes are treated as numbers. Names defined by
definecommand are treated as number. Also results of formulas with sizes 1x1x1 are treated as number (for example, ‘pi/dat.nx’).
Before the first using all variables must be defined with the help of commands, like,
sum and so on.
Command may have several set of possible arguments (for example,
plot ydat and
plot xdat ydat). All command arguments for a selected set must be specified. However, some arguments can have default values. These argument are printed in , like
text ydat ['stl'=''] or
text x y 'txt' ['fnt'='' size=-1]. At this, the record
[arg1 arg2 arg3 ...] means
[arg1 [arg2 [arg3 ...]]], i.e. you can omit only tailing arguments if you agree with its default values. For example,
text x y 'txt' '' 1 or
text x y 'txt' '' is correct, but
text x y 'txt' 1 is incorrect (argument
'fnt' is missed).
For more details see MathGL documentation
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This document was generated by Alexey Balakin on December 13, 2012 using texi2html 1.82.