Matrices inside matrix operation

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Alan Campos Valdillez 2020-2-10

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关闭： MATLAB Answer Bot 2021-8-20

I am working on a synchronous machine model and need to perform some operations, for example:

a=(omegar*T3-Rs-omegar*T5*inv(Lr)*T4)*is;
b=(omegar*T5*inv(Lr))*lambdar;
c=(T3-T5*inv(Lr)*T4)*dis;
d=(T5*inv(Lr))*dlambdar;

where all the terms involved, except "is","dis","dlambdar" and "lambdar", are matrices.

I am trying to form a 2x1 matrix which contains these terms as follows:

vs=[a+c;b+d];

but an error regarding dimensions appears. I have performed every product individually and the problem is not due to an individual matrix dimension. Thanks in advance for your help!

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Answer 1

David Hill 2020-2-10

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Please attach examples of your matrices; otherwise, it is hard to help.

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Alan Campos Valdillez 2020-2-10

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Some matrices are defined like this:

Ks=2/3*[cos(phir) cos(phir-2*pi/3) cos(phir+2*pi/3);-sin(phir) -sin(phir-2*pi/3) -sin(phir+2*pi/3);1/2 1/2 1/2];
invKs=[cos(phir) -sin(phir) 1;-cos(phir+pi/3) sin(phir+pi/3) 1; -cos(phir-pi/3) -cos(phir+pi/6) 1]; 
dinvKs=wr*[-sin(phir) -cos(phir) 0;sin(phir+pi/3) cos(phir+pi/3) 0; -sin(phir+2*pi/3) sin(phir+pi/6) 0];
omegar=[0 -wr 0;wr 0 0;0 0 0];
T1=Ks*rs*invKs;
T2=Ks*dinvKs;