How to multiply two matrices where A= 1415×6 and B=6×128

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Nandita Sarkar 2022-2-8

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https://ww2.mathworks.cn/matlabcentral/answers/1645895-how-to-multiply-two-matrices-where-a-1415x6-and-b-6x128

评论： John D'Errico 2022-2-9

Matrices A=1415×6 and B=6×128

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Nandita Sarkar 2022-2-9

编辑：Nandita Sarkar 2022-2-9

I want my output 1415×128.

John D'Errico 2022-2-9

在 MATLAB Online 中打开

Then A*B is EXACTLY what you do. Why do you think that is not what you get?

A = rand(1415,6);B = rand(6,128);
C = A*B;
size(C)
ans = 1×2
        1415         128

Maybe you need to do as @Cris LaPierre suggests, and review what a matrix multiplication means, and then consider what the * operator does?

help mtimes

* Matrix multiply. X*Y is the matrix product of X and Y. Any scalar (a 1-by-1 matrix) may multiply anything. Otherwise, the number of columns of X must equal the number of rows of Y. C = MTIMES(A,B) is called for the syntax 'A * B' when A or B is an object. See MATLAB Operators and Special Characters for more details. See also TIMES, PAGEMTIMES. Documentation for mtimes doc mtimes Other functions named mtimes calendarDuration/mtimes InputOutputModel/mtimes codistributed/mtimes LagOp/mtimes dlarray/mtimes laurmat/mtimes duration/mtimes laurpoly/mtimes fints/mtimes tall/mtimes gpuArray/mtimes timeseries/mtimes icsignal/mtimes tsdata.datametadata/mtimes

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