How to replace the 5 in my vector with decreasing numbers like 5,4,3,2,1

x(3:4,3:5) = 5

[Image Analyst]

The 5 what?

1. The 5 values in the matrix that equal 5?
2. Five elements in your matrix?

It's ambiguous because it's not clearly worded. How can you replace one number -- "the 5" -- with a set of 5 numbers? Are there exactly 5 elements in your matrix that have the value 5? What is the order that you replace them with: column major, or row major?

You are specifying a submatrix of 6 indexes. You didn't tell us how big x is or what its values are. Is this homework?

[Walter Roberson]

This is not clear, as you do not appear to have a vector.

[Pallav Patel]

Try the command in Matlab and you will see the columns and rows specified will be filled with 5's. Matlab automatically fills an undefined vector with zeros. what I am trying to do is have a decreasing or increasing number and that was just a template to upload to Mathworks. I have seen such an example before but can't seem to find it.

Answer 1

[Walter Roberson]

x(3:4,3:5) = reshape(5:-1:0, 2, 3);

Answer 2

[madhan ravi]

Z=num2cell(x);
Z(cellfun(@(zx)zx==5,Z))={5:-1:1}
celldisp(Z)

[Pallav Patel]

Thank you Madhan. Is ther any way I can do it without the cell function.