Apply a formula and create a new matrix
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matlabuser
el 27 de Ag. de 2020
Comentada: matlabuser
el 28 de Ag. de 2020
Suppose I have 2 matrices :
x = ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352661/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352661/image.png)
and y = ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352664/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352664/image.png)
I am not able to figure out the code that will output a matrix which calculates the following: ![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352667/image.png)
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/352667/image.png)
1 comentario
Star Strider
el 27 de Ag. de 2020
That looks like striaghtforward matrix-vector multiplication to me.
Respuesta aceptada
Bruno Luong
el 27 de Ag. de 2020
Editada: Bruno Luong
el 27 de Ag. de 2020
b.'*sum(A,2)
sum(A,2).'*b % preferable than
sum(A.'*b) % or
sum(b.'*A) % or
sum(A.*b,'all')
or
s = 0;
for i=1:size(A,1)
for j=1:size(A,2)
s=s+A(i,j)*b(i);
end
end
s
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