Subscript indices must either be real positive integers or logicals

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EL 2017-10-25

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https://ww2.mathworks.cn/matlabcentral/answers/363175-subscript-indices-must-either-be-real-positive-integers-or-logicals

评论： Geoff Hayes 2017-10-25

I am trying to move values from an array to another. In particular I am taking the value of the red, green and blue of the specific pixel of the image using the command

img(x,y,:) %where img is my image

and I want to put it in an array defined as pix1 = zeros(3,1). When I do the simple equation pix1(:,1) = img(x,y,:) I get the error ' Subscript indices must either be real positive integers or logicals'. If I understood well this is due to the fact that the rgb values are floats? How do I get to put them in the array pix1 without rounding the value?

Thanks

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EL 2017-10-25

I am rotating an image and then scrolling each pixel to do the bilinear interpolation with the four surrounding pixels. So I must get the value of the image at x = u-1 which at a certain point becomes zero. I guess I'll just shift the image so as to be constantly in the positive domain.