What does Subscripted assignment dimension mismatch mean? I keep getting the same error?

Question

Hiroshi Nakamura 2015-2-18

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关闭： MATLAB Answer Bot 2021-8-20

I keep getting the same error for the following code:-

Error in dct1 (line 12) d(j,k) = c*double(b(j,k));

whereby c = dctmtx(8), and is a 8 * 8 doubles matrix.... I tried replacing c*double(b(j,k)) with c.*double(b(j,k)) but it returned the same error..... Whelp ?

M = 1600
N = 3600
    for j = 1:8:M
        for k = 1:8:N
            d(j,k) = c*double(b(j,k)); //c is a 8*8 doubles matrix
        end
    end

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Answer 1

Yoav Livneh 2015-2-18

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The error means that the destination is not the same dimension as the source. In this case, you are trying to write an 8x8 matrix (c) into a 1x1 scalar (d(j,k)).

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Answer 2

Hiroshi Nakamura 2015-2-18

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OMG I just realized that! Thanks! What I really was trying to do was multiply the c matrix (8*8) by smaller 8*8 matrixes in the 1600*3600 matrix.. Any idea how to do that? Thanks again appreciate your help!