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How can I fix the error when multiple two matrices?

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Nguyen Tuan
Nguyen Tuan 2015-8-6
回答： Steven Lord 2015-8-6
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

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James Tursa
James Tursa 2015-8-6
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;

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Steven Lord
Steven Lord 2015-8-6
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)
Do you want to generate a 10-by-10 matrix, the multiplication table for x and y?
z4 = x*y.';
isequal(z4(7, 8), x(7)*y(8))
multiplicationTable = [NaN, y.'; x, z4]

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