How can I which value that be used to calculate a function

In this casue, I difine a range for x and y, and then calculated the min value of L, but how do i find which x vaule and y value to calculate the min L? Many thanks!!!!!

Answer 1

[Fangjun Jiang]

You need to run min() twice

A=magic(5);
[MinInCol,RowIndex]=min(A);
[MinValue,ColIndex]=min(MinInCol);
Position=[RowIndex(ColIndex),ColIndex];

or better

[MinValue,Index]=min(A(:));
[Ix,Iy]=ind2sub(size(A),Index)

[Tianze Li]

Yes. It did show the row and coloum for both x and y. But how can i display the value from that row and coloum instead of to find them from the array

[Fangjun Jiang]

Not clear what you mean. Maybe in your example, you are looking for x(Ix), y(Iy)?

Answer 2

[Steven Lord]

Since you indicate that you're using release R2019a, call min with the 'linear' option and two output arguments. This will give you the linear index of the minimum value, and you can use that index into x and y.