Let's say I have a matrix of size 100X100. I wish to manipulate certain elements of the Matrix which are in Rows 10 to 15 and coulmns 11 to 13, which are negative numbers. I donot wish to change the elements which are negative outside the specified Rows and Columns.
Is it possible to do this without creating any new variable ? by using Logical Indexing?
Edit: I have generalized the question, but here is where I intend to implement the solution provided. I have a 15X16 matrix in which there are NaN values in random positions of the matrix. I would like to set these NaN values to 0s' in only the sub-matrix formed by Rows 2 to 15 and Columns 2 to 16. So in this case I would be required to use the isnan function.