how to remove the error showing undefined function or variable

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hello, i am using function block in matlab simulation .in that want to generate matrix X1 from matrix A
for j1=1:k2
for j2=1:m1
for j3=1:n1
X1(m1*(j1-1)+j2,j3)=A(j2,j3);
end
end
end
but executing code am getting error....
Undefined function or variable 'X1'. The first assignment to a local variable determines its class.
Function 'Subsystem9/Mtesting' (#53.2154.2156), line 66, column 16:
"X1"
Launch diagnostic report.

Accepted Answer

David Hill
David Hill on 21 Sep 2019
Preallocate X1 before the loop.
X1=zeros(m1*k2,n1);
  1 Comment
ram kumar
ram kumar on 21 Sep 2019
thankyou.
but in this simulation again facing on more error
Errors occurred during parsing of MATLAB function
any suggestion to remove it.

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