When IDL V5.0 was released, one of the new features was supposedly the removal
of language limits, e.g. "an unlimited number of variables is now accepted, and
users can freely add new variable names with the EXECUTE statement."
In practice, I find the V5.0 EXECUTE limits the same as they were in V4.0.
In the example below, I try to use EXECUTE to define an anonymous structure
at run-time. (Note that I can't use the CREATE_STRUCT function, because
CREATE_STRUCT requires that one know the number of tags beforehand.) This
works fine so long as the EXECUTE string does not exceed a certain length --
which seems to vary from machine to machine. Otherwise I get a "Program
code area full" error message.
Note that I never have a problem if I instead write the structure definition
string to a temporary procedure file and compile the file. (This is the
workaround used by Tom McGlynn's MRD_STRUCT procedure at
http://idlastro.gsfc.nasa.gov/ftp/pro/structure) So it does seem that
problem is caused by (machine-dependent?) limits to the EXECUTE statement.
Any Comments?
Wayne Landsman landsman@mpb.gsfc.nasa.gov
IDL> print,!VERSION
{ alpha OSF unix 5.1 Apr 13 1998}
IDL> a = 'd = {name:0'
IDL> for i=0,99 do a = a + ',name' + strtrim(i,2) + ':0'
IDL> a = a + '}'
IDL> res = execute(a)
d = {name:0,name0:0,name1:0,name2:0,name3:0,name4:0,name5:0,name 6:0,name7:0,
name8:0,name9:0,name10:0,name11:0,name12:0,name13:0,name14:0 ,name15:0,name16:0,
name17:0,name18:0,name19:0,name20:0,name21:0,name22:0,name23 :0,name24:0,
name25:0,name26:0,name27:0,name28:0,name29:0,name30:0,name31 :0,name32:0,
name33:0,name34:0,name35:0,name36:0,name37:0,name38:0,name39 :0,name40:0,
name41:0,name42:0,name43:0,name44:0,name45:0,name46:0,name47 :0,name48:0,
name49:0,name50:0,name51:0,name52:0,name53:0,name54:0,name55 :0,name56:0,
name57:0,name58:0,name59:0,name60:0,name61:0,name62:0,name63 :0,name64:0,
name65:0,name66:0,name67:0,name68:0,name69:0,name70:0,name71 :0,name72:0,
name73:0,name74:0,name75:0,name76:0,name77:0,name78:0,name79 :0,name80:0,
name81:0,name82:0,name83:0,name84:0,name85:0,name86:0,name87 :0,name88:0,
name89:0,name90:0,name91:0,name92:0,name93:0,name94:0,name95 :0,name96:0,
name97:0,name98:0,name99:0}
% Program code area full.
0
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