Matlab/simulink error (Mismatched varying and fixed sizes indicate a probable run-time error.)

Hello,

I'm trying to replicate a model of the dfig controller of a wind turbine using neural networks and for some reason I'm getting an error that I cannot fix.

Size mismatch (size [1 x 6] ~= size [:? x 6]). Mismatched varying and fixed sizes indicate a probable run-time error. If this diagnostic is incorrect, use indexing to explicitly make the varying size fixed.

This is where I'm getting the errors in my code

e=t1-J; wct=[wc(1) wc(2) wc(3) wc(4) wc(5) 0]; del_wa1 = lr*-(e*p*(0.5*(1-J^2))*(wct'*wc1*0.5*(1-o^2))); del_wa1t=del_wa1*tr; ERROR!!!!!!!! wa1 = wa1 + del_wa1t; g=p*tr'; %to create a vector from variable p

v=[m(1) m(2) m(3) m(4) 0 0]'; del_wa = lr*-(e*wa1*v*(0.5*(1-J^2))*(0.5*(1-p^2))*(wct'*wc1*(0.5*(1-o^2)))); f=del_wa*tr1; ERROR!!!!!!! wa = wa + f;

wc1 is a persistent variable; rand(1,6) t1, lr and J are scalars p and o are also scalars wa1 is a persistent variable; rand(1,6) tr=ones(1,6) wa is a persistent variable; rand(1,4) wc is a persistent variable; rand(1,5)

wa and wa1 are variables that must be continouusly updated

Can anyone give a hand with this, please?

Answer 1

[Greg Heath]

The command

 whos

will show the dimensions of all quantities

To multiply two column vectors with the same dimensions

EITHER use .* instead of * and get a vector of the same size

 c = a .* b  % size(c)=size(a)=size(b)

OR transpose the first one before multiplying and get a scalar

 d = a' * b  % size(c) = [ 1 1 ].

Notice that

d = sum(c)

Hope this helps.

Thank you for formally accepting my answer

Greg