| Re: FOR LOOP problem [message #30975 is a reply to message #30974] |
Fri, 31 May 2002 14:45   |
Doug Rowland
Messages: 12
Registered: March 2002
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Junior Member |
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What happens if the image you are reading in is only 400x400 bytes (as seems
to be implied by the filename)?
Does readu then redefine image to be a 400x400 array or does it just leave
the rest of the 462x350 array blank?
How about trying this:
image = bytarr(462, 350)
image_mod = bytarr(462, 350)
openr, 1, FILEPATH(SUB=['examples','data'], '400_400_gb')
readu, 1, image
print,size(image)
close,1
end
Doug Rowland
rowland@fields.space.umn.edu
On 05/31/02 4:27 PM, in article MPG.176198a6982878fc989905@news.frii.com,
"David Fanning" <david@dfanning.com> wrote:
> Shravan Kumar Durvasula (skd6@ra.msstate.edu) writes:
>
>> I am very much new to IDL. Could anyone please tell me what the problem is
>> with
>> this .pro file?
>>
>> ************************************************************ **********
>> image = bytarr(462, 350)
>> image_mod = bytarr(462, 350)
>> openr, 1, FILEPATH(SUB=['examples','data'], '400_400_gb')
>> readu, 1, image
>> FOR i = 0, 461 DO BEGIN
>> FOR j = 0, 349 DO image_mod[i,j] = image[i,j]
>> ENDFOR
>> close, 1
>> ************************************************************ *********
>>
>> It gives me the following error message :
>>
>> ************************************************************ *********
>> % Attempt to subscript IMAGE with I is out of range.
>> % Execution halted at: $MAIN$
>> ENDFOR
>> ^
>> % Syntax error.
>> At: D:\webpages\IONJava\examples\ndvi_pro.pro, Line 7
>> ************************************************************ *********
>
> I suspect the problem lies in how you are trying to
> run this program. I recommend you put another END at the
> end of the program file (after the CLOSE statement),
> then run it like this from the IDL command line:
>
> IDL> .Run ndvi_pro
>
> Does that work better? This will compile the code before
> it tries to run it. I think that will work better for you.
>
> I should point out that you can more easily do what you
> want to do (and a hell of lot faster!) by simply writing this:
>
> image_mod = image
>
> Cheers,
>
> David
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