Subscripted assignment dimension mismatch

to any kind folks, pls help me to find a solution the the error below: Subscripted assignment dimension mismatch. your kind help is greatly appreciated

for a =1:30
    for P=1:1
        o=(P-1)*30; 
        for r=1:2
            if r==2
                t=-4;

                  pA1(1:13+t,1:13+t,r,P)=A(17*r-16+o:17*r+t+o,1:17+t); <-- error begins here
          pB1(1:13+t,1,r,P)=B(17*r-16+o:17*r+t+o,1:17+t);
          beta(r,P)=A(17*r-16+o:17*r+t+o,a)\B(17*r-16+o:17*r+t+o,a);
       else
                  t=0;
                  pA(1:13+t,1,r,P)=A(17*r-16+o:17*r+t+o,a);
                  pB(1:13+t,1,r,P)=B(17*r-16+o:17*r+t+o,a);
                   beta(r,P)=A(17*r-16+o:17*r+t+o,a)\B(17*r-16+o:17*r+t+o,a);              
              end

          end
      end
  end

Answer 1

[Andreas Goser]

This cannot be run:

Undefined function 'A' for input arguments of type 'double'.

Error in xxx (line 13) pA(1:13+t,1,r,P)=A(17*r-16+o:17*r+t+o,a);

Need to speculate. When the first error comes it calls A(1:13,1:13). You can find out if A has those sizes.

[seprienna]

i'm trying to create a partition for 25 x 30 , 1st-17 2nd-13 my A is 17x17 how can i create 2 beta ( 17x17 & 13x13) please advise the way forward.thank you

A=randi(20,25,30); % creating random A
beta_r = randi(10,30,30); % creating random beta
B = A*beta_r;