Error with matrix multiplication?

조회 수: 2 (최근 30일)
Shayma Al Ali
Shayma Al Ali 2020년 12월 14일
답변: Jan 2020년 12월 14일
I have two matrices I'd like to multiply. Matrix A has dimensions 107x817. Matrix B has dimensions 817x1. My understanding of matrix multiplication is that the inner dimensions have to agree. So if I multiply A*B than it should work? However, I keep getting back an error.

답변 (2개)

Matt J
Matt J 2020년 12월 14일
편집: Matt J 2020년 12월 14일
Yep, it should work, as the following example shows. I would check to make sure the matrix dimensions are really what you think they are.
A=rand(107,817); B=rand(817,1);
C=A*B;
whos A B C
Name Size Bytes Class Attributes A 107x817 699352 double B 817x1 6536 double C 107x1 856 double

Jan
Jan 2020년 12월 14일
This should work. Use the debugger to let Matlab stop when the error occurs - type this in the command window:
dbstop if error
Then run your code again. If Matlab stops, check if the sizes of the arrays are what you expect them to be.

카테고리

Help CenterFile Exchange에서 MATLAB에 대해 자세히 알아보기

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by