"Subscripted assignment dimension mismatch." error matlab

Hi,

I do not know why I have "Subscripted assignment dimension mismatch." error at line u(i,j)=1./sum_d;. Below is my coding:

%update U
    for i=1:nc
        for j=1:o
            sum_d=0;
            for k=1:nc
                sum_d = sum_d + (distance(c(i,:),x(j,:))/distance(c(k,:),x(j,:)))^(2/(m_exponent-1));
            end
            u(i,j)=1./sum_d;
        end
    end

Hope to get the solution soon.Thanks.

Answer 1

[Walter Roberson]

What size() does distance(c(i,:),x(j,:)) return? If it is not a scalar then you would be doing "/" between two arrays which is possibly not going to return a scalar.

[Ong Teng]

Hi, how can I know the size of distance(c(i,:),x(j,:)) return? I am sorry I am just a new beginner of matlab user.

Answer 2

[Star Strider]

I suggest you run this statement separately (it’s now part of your sum_d statement)

(distance(c(i,:),x(j,:))/distance(c(k,:),x(j,:)))^(2/(m_exponent-1));

and check its dimensions. It might be a vector, meaning that sum_d will be a vector.

This line

u(i,j)=1./sum_d;

wants sum_d to be a scalar.

[Ong Teng]

Hi,

Sorry, how can i run it separately?

Thanks.

[Star Strider]

d = (distance(c(i,:),x(j,:))/distance(c(k,:),x(j,:)))^(2/(m_exponent-1));

[Ong Teng]

Hi,

Do u means run the code as below? But I still get the same error. Please help me to solve, please.I am just a new beginner using Matlab. Thanks

%update U

   for i=1:nc
          for j=1:o
              sum_d=0;
              for k=1:nc
                  sum_dx=(distance(c(i,:),x(j,:))/distance(c(k,:),x(j,:)))^(2/(m_exponent-1));
                  sum_d = sum_d + sum_dx;
              end
              u(i,j)=1./sum_d;
          end
      end

[Ong Teng]

Hi,

How can I change this line

u(i,j)=1./sum_d;

wants sum_d to be a vector.

[Ong Teng]

Hi,

Can anyone pls help me on this problem please?

Thanks.