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IDL Save Object Resoration [message #90821] Tue, 21 April 2015 04:17 Go to previous message
David B is currently offline  David B
Messages: 18
Registered: January 2015
Junior Member
Suppose I create a variable:

----------------------------------------
;Create arrays
a = [1,2,3,4,5,6]
b =[7,8,9,10]
c = INDGEN(10,10)

;Save these arrays normally
save, a, b, c, filename = 'file.sav'

;Run a reset
.reset

;Restore these variables, but into an object
sobj= OBJ_NEW('IDL_Savefile', 'file.sav')

;Extract names
names = sObj->Names()

;Print
Print, names

----------------------------------------

The problem is that I need the variables to be named something differently, but I cannot extract the variables into a new name. Non of my objects are heap variables, just standard variables.

For example, following this:

http://www.exelisvis.com/docs/idl_savefile__restore.html#obj ects_misc_904195448_1034949

One can restore Pointers and Objects into a new object/pointer, so you can automatically rename your variables on the fly with the line:

----------------------------------------
; Restore the heap variable, associating it with a new regular
; variable. Note that ptrName is (in this case) a one-element array.
sObj->Restore, ptrName[0], /POINTER_HEAPVAR, NEW_HEAPVAR=myNewPtr
----------------------------------------

I have an almost solid reason for doing this in my case. What I am therefore saying is that I want for example (but I cannot do this, because 'new_variable' is not an option in the restore method!)

FOR i = 0, n_elements(names)-1, 1 DO BEGIN

sobj->Restore, names[i], new_variable = 'new_'+names[i]

ENDFOR

SO I end up with the following as a result:

new_a = a
new_b = b
new_c = c

Where I can restore a simple variable, like an array, into a new name. I may be missing the point here but I cannot think of a way to do this in a strait forward way, and the 'EXECUTE' command is out of the question for these objects.

Clearly I am being stupid, but I really am stuck. Also, I know this method does not work as:

new = obj->Restore, names[i], new_variable = 'new_'+names[i]

otherwise, my problem would be solved easily. Can anyone offer insight into this and point out my mistake?

Thanks much

David

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