On Tuesday, April 21, 2015 at 2:01:58 PM UTC+1, Jim P wrote:
> On Tuesday, April 21, 2015 at 5:17:04 AM UTC-6, David B wrote:
>> 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
>
> Why not wrap your Restore call in a procedure and use the names you want as parameter or keyword arguments?
>
> pro myrestore, sObj, a = a, b = b, ...
> sobj->restore, a, ...
> end
>
> pro mymain
> sobj = idl_savefile(...)
> myrestore, sobj, a = new_a, b = new_b, ...
> help, new_a, new_b, ...
> end
>
> If you're going to generate the new names on the fly, you might want to consider using a hash instead.
>
> Jim P.
I THINK that is also a valid approach too! A further possibility is such that:
---------------------------------------
;Recover the names of the objects
name = sObj->Names()
;Name is then a STRARR ---> name = ['a', 'b', 'c']
;Then do a loop
FOR i = 0, n_elements(name)-1, +1 DO BEGIN
res = EXECUTE('new_'+name[j]+' = TEMPORARY(name[j])'
ENDFOR
---------------------------------------
The Hash method is also a good approach from Michael and works fine!
Regards
David
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