replacement of for loop

I am writing this statement as replacement of for loop operation

indexes= ROI~=255 && ROI~=0;

ROI is a matrix and I am trying to find those indexes in the matrix ROI whose values are other than 0 and 255. but this statement gives some error. Kindly help by showing me correct syntax.

Answer 1

[Jiro Doke]

It should be & instead of &&

indexes= ROI~=255 & ROI~=0;

[Khawaja Asim]

it was v simple :) how i couldn't try that.. lol

thanks.