How can I fix the error when multiple two matrices?
1 view (last 30 days)
Show older comments
I have two (100*1) matrices. When I multiple them, an error occured "??? Error using ==> mtimes Inner matrix dimensions must agree. Please help me to fix it
0 Comments
Accepted Answer
James Tursa
on 6 Aug 2015
Did you mean element-wise multiplication? If so, use the .* operator. E.g.,
a = your 100 x 1 vector
b = your 100 x 1 vector
result = a .* b;
0 Comments
More Answers (1)
Steven Lord
on 6 Aug 2015
How do you want to multiply them? Element-by-element, to generate a vector the same size as x and y where each element is the product of the corresponding elements in x and y?
x = (1:10).';
y = (1:10).';
z1 = x.*y; % NOTE the period
isequal(z1(4), x(4)*y(4)) % for scalar multiplication, the * and .* operators are the same
Do you want to generate a 1-by-1, the dot product of the two vectors?
z2 = dot(x, y);
z3 = x.'*y;
isequal(z2, sum(x.*y))
isequal(z2, z3)
z4 = x*y.';
isequal(z4(7, 8), x(7)*y(8))
multiplicationTable = [NaN, y.'; x, z4]
0 Comments
See Also
Categories
Find more on Arithmetic Operations in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!