Simple array multiplication of incompatible sized arrays
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I would like to multiply these two arrays of different size and I am recieving the error :
"Arrays have incompatible sizes for this operation"
which makes sense, researching this question on other forums I found you can "Pad with zeros" and I would like to do that but I don't know how.
NEDsv=NED*SV;
%SV is a 62x3 double
%NED is a 186x3 double
1 个评论
Clay Swackhamer
2023-9-5
I think matrix multiplication requires that the first matrix must have the same number of columns as the number of rows in the second matrix. So can you just transpose SV like this:
NEDsv = NED * SV'
采纳的回答
What KIND of "multiply"? "*" is matrix multiplication and
SV=rand(62,3);
NED=rand(186,3);
M=NED*SV.';
whos M
so you can multiply them if you transpose the second...of course, that may not be what you had in mind; you didn't tell us what you expected the result to be, but if one takes the hint about augmenting with zeros, then
M=NED.*[SV;zeros(size(NED,1)-size(SV,1),size(NED,2))];
whos M
Of course, this is <element-wise multiplication>, something much different than <matrix multiplication> and uses the "dot" operator ",*".
3 个评论
Bruno Luong
2023-9-5
编辑：Bruno Luong
2023-9-5
"dot" operator ",*"
@dpb You are eligible for french citizenship, we prefer comma to dot. ;-)
dpb
2023-9-5
@Bruno Luong -- chuckle...blame "fat fingers" instead....
olivia
2023-9-6
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