| Re: Evaluating a variable [message #37724] |
Thu, 22 January 2004 10:04  |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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Richard writes:
> I want to evaluate a (string) variable to then perform an operation on
> (another) variable whose name is the result of that evaluation.
>
> Let me clarify...
>
> I have a number of 1-D floating-point arrays. I want to take each array
> in
> turn and do stuff with it, something like this:
>
> PRO blah
>
> array1=[1,4,3,5.3,42,234,32,..(etc)]
> array2=[1,6,4.65]
> array3=[9.1,4,2.02,5,6]
>
> arrays=['array1','array2','array3']
> arrayno=-1
>
> REPEAT BEGIN
> arrayno=arrayno+1
>
> ; Pick which array I want to operate on, in order
> ; **************************************
> thisarray=arrays(arrayno)
> ; **************************************
>
> ; Do stuff on the selected array
> ROUTINE_DOSTUFF,thisarray
>
> ; Loop through all the arrays.
> ENDREP UNTIL arrayno=2
>
> END
>
> Except, of course, that this doesn't work, because (in the highlighted
> line) the variable 'thisarray' is set to be the string value 'array1'
> (etc), instead of having the actual array1 copied into it.
You could put your arrays into some kind of a list. (Something
as simple as a pointer array might work, or you could use
something like a linked list, if you want something more
complicated.) I'd try something like this:
myArrays = PtrArr(3)
myArrays[0] = Ptr_New(array1, /No_Copy)
myArrays[1] = Ptr_New(array2, /No_Copy)
myArrays[2] = Ptr_New(array3, /No_Copy)
Then, when you want an array to work with:
thisarray = *(myArrays[arrayno])
Cheers,
David
--
David W. Fanning, Ph.D.
Fanning Software Consulting, Inc.
Phone: 970-221-0438, E-mail: david@dfanning.com
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Toll-Free IDL Book Orders: 1-888-461-0155
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