if i have two matrix how can make them same size by add zero column or row ?

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Firas Al-Kharabsheh
编辑： Stephen23 2016-5-3
if i have this matrix
M = [15 13 11 11 7 7 8 9 11 13 15 8 8 6 3 0 3]
X = [15 13 11 12 7 5 4 7 8 8 11 9 14 11 13 ]
i want to make X the same size of M and after that subtract them like that
X_after = [15 13 11 12 7 5 4 7 8 8 11 9 14 11 13 0 0]
then abs(M - X_after) the final solution will be
Final = [ 0 0 0 1 0 2 4 2 3 5 4 1 6 5 10 0 3]

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回答（2 个）

dpb
dpb 2016-5-3
doc size
doc zeros
Read "Getting Started" section of documentation and work thru the tuorials on basic Matlab syntax and matrix/array operations.
Stephen23
Stephen23 2016-5-3
编辑：Stephen23 2016-5-3
M = [15,13,11,11,7,7,8,9,11,13,15,8,8,6,3,0,3];
X = [15,13,11,12,7,5,4,7,8,8,11,9,14,11,13];
tmp = zeros(2,max(numel(M),numel(X)));
tmp(1,1:numel(M)) = M;
tmp(2,1:numel(X)) = X;
out = abs(diff(tmp,1,1))
creates:
out =
0 0 0 1 0 2 4 2 3 5 4 1 6 5 10 0 3
And please do the introductory tutorials:
http://www.mathworks.com/help/matlab/getting-started-with-matlab.html

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