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Re: external string EXP for MATH_DOIT (ENVI)
| Re: external string EXP for MATH_DOIT (ENVI) [message #79681] |
Fri, 23 March 2012 03:53 |
titan
Messages: 59
Registered: March 2006
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On 23 Mar, 11:25, titan <thunder...@inwind.it> wrote:
> Hi all,
> even if this is a problem related to ENVI I was wondering if perhaps
> someone had already similar experience on this topic:
> I'm trying to give as string expression for MATH_DOIT a string that
> has to be read from a metadata file (.txt).
> I'm able to extract the string to be passed and when I give it as
> input for the EXP keyword it seems to create the image.
> But when I try opening it I got the following error
>
> Error: "POLY_2D: String expression not allowed in this context: ARR."
> The result may be invalid
>
> Does somebody know any workaround for this error??
>
> thanks a lot
Ok I already solved this problem on my own.
The trick was that even if I extracted the string (let's indicate it
as str) from a string array and it was recognized as string when
looking at the output of HELP in the EXP keyword it has to be defined
as EXP=STRING(str).
It seems that you have to force it to become a string but in any case
it works now.
I hope this could be useful for someone else in the future.
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