HELP!!! how to deal with x(i,j,k,l)​.*y(j,k,l)​.*d(j,k)

my function contains some high dimonsional matrix:how to deal with x(i,j,k,l).*y(j,k,l).*d(j,k)?

and matlab warnings a argument must be numeric.

[Guillaume]

You need to give a lot more context to your question if you want help.

I suspect that you're doing your multiplication inside a loop, so show us the code of that loop. Also give us the size and class of x, y and d.

And if you get an error, give us the full text of the error message.

[Qiandong Dong]

P=10;
F=5;
W=5;
T=3;
x = optimvar('x',P,F,W,T,'LowerBound',0);
y = optimvar('y',F,W,T,'Type','integer','LowerBound',0,'UpperBound',1);
dist =optimvar('dist',F,W,'LowerBound',0);
c=0;
for t=1:T
  for p=1:P
      for f=1:F
          for w=1:W
    c = c+ dist(f,w).*x(p,f,w,t).*y(f,w,t);
          end
      end
  end
end

错误使用 optim.internal.problemdef.Times.getTimesOperator

At least one argument must be numeric.

出错 .*

Answer 1

[Qiandong Dong]

I see. U cannot times variable(sign) matrix. But how to express large-scale nonlinear function in matlab?