Description:
- postscriptfile is a special value used in commands plot and externalplot to save
the result of the command in a data file and a postscript file.
- As any value it can be affected to a variable and stored in lists.
Example 1:
> savemode=postscriptfile;
> name="plotSinCos";
> plot(sin(x),0,cos(x),[-Pi,Pi],savemode, name);