Replacing min and max values

For a given matrix I need to replace each element which is not min or max with the value 99

For example let

M=[5 0 2;8 3 1;1 8 0]

I tried the following code

M(M~=min(M(:))|M~=max(M(:)))=99;

but it replace all the matrix elements include 8 and 0 which are the max/min elements

Answer 1

[Star Strider]

Use ‘logical indexing’:

M=[5 0 2;8 3 1;1 8 0];
Mn = M == min(M)
Mx = M == max(M)

See the documentation on Using Logicals in Array Indexing (link).

I leave the rest to you.