error in storing values

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FIR
FIR 2012-5-23
I have a code in which i process two images
for xx = 1:length(dirlist(1:2))
x = imread([pathname, dirlist(xx).name]);
x=rgb2gray(x);
.
.
.
.
.
.
PSNR = 20 * log10 (255 / sqrt(S));
PSNR(:,xx)=PSNR
end
i have calculated PSNR for two images i get different values of PSN for each image,but wen i concatanate 2 values of PSNR i get same value ,please help
for ex wen i process
PSNR =
38.8500
PSNR =
39.8618
PSNR =
39.8618 39.8618
please help

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采纳的回答

Wayne King
Wayne King 2012-5-23
Don't use the same variable below, use a different variable.
PSNR = 20 * log10 (255 / sqrt(S));
PSNRS(xx) =PSNR;

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