how can i multiply two matrices?
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I have a matrix 'a' with size 3x3 and 'b' with size 3x1.i want to multiply the inverse of 'a' with matrix 'b'.I tried the below code but got an error "Matrix dimensions must agree". please help to solve this
a=[1 0 -3; 2 -2 1; 0 -1 3];
inv_a=inv(a);
b=[0;2;121];
c=inv_a.*b;
2 个评论
Beder
2017-2-23
This code does not produce any error on my system. Maybe you have a variable called "inv" which overlays the function "inv"?
Walter Roberson
2017-2-23
Beder,
I suspect you are using R2016b, which introduced automatic vector expansion as if bsxfun() had been used.
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Walter Roberson
2017-2-23
c=inv_a * b;
not .*
inv_a is a 3 x 3 matrix, and you want algebraic matrix multiplication by the 3 x 1 matrix b in order to get the 3 x 1 solution.
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