# Multiply a cell array with a matrix in an equation

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MarshallSc el 9 de Jul. de 2021
Comentada: MarshallSc el 9 de Jul. de 2021
Hello, I have a cell array like below (let's call it C).
C:
And a 4*4 matrix for example:
A=rand(4,4);
I want to multiply these arguments (multiply the first component of A (A(1,1)) to all the values in the first component of C(C{1})) in an equation such that:
eqn=A*C + (1-A)*C
How can I do this?
I tried for loop but didn't work. I also tried to just use element wise multiplication but didn't work either, I get the error below:
Operator '.*' is not supported for operands of type 'cell'.
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Matt J el 9 de Jul. de 2021
I tried for loop but didn't work
Since you haven't shown us the code you tried, we cannot tell you why it didn't work.
MarshallSc el 9 de Jul. de 2021
Editada: MarshallSc el 9 de Jul. de 2021
It's basically writing the equation above:
for i=1:4
for j=1:4
eqn{i,j}=A(i,j).*C{i,j}+(1-A(i,j)).*C{i,j};
end
end

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Matt J el 9 de Jul. de 2021
Your code gives me no errors, but make sure you pre-allocate an empty cell array for eqn:
eqn=cell(4);
for i=1:4
for j=1:4
eqn{i,j}=A(i,j)*C{i,j}+(1-A(i,j))*C{i,j};
end
end
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Matt J el 9 de Jul. de 2021
eqn{i,j}=A{i,j}.*C{i,j}+(1-A{i,j}).*C{i,j};
MarshallSc el 9 de Jul. de 2021
Thank you!

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