simulink error:Class mismatch for variable 'exist'. Expected 'logical', Actual 'double'.

I get a error in a MATLAB function block

coder.extrinsic('exist');

N=1296;

if  exist('w_1','var')

      W1=w_1;
  else
      W1=zeros(N,1);
  end

Answer 1

[chengxuan yu]

Because 'exist' return a double value and 'if' need to follow a logical value.

you can modify the code like this:

if isequal(exist('w_1','var'),1)
W1=w_1;
else
    W1=zeros(N,1);
end