MATLAB: How to replace values

Question

How can I replace values? I've a matrix of 3653×337 Let's consider I've

• dates values
• 0101 0
• 0102 0
• 0103 0
• 0104 1
• 0105 0
• 0106 0
• 0107 0 ….

I need a function to find all these "1"'s in my matrix and to replace it for two days before and after I've a "1".

Thanks!

Answer 1

Here is a simple way that should be easy to understand. I am sure there are slicker ways, but maybe this will suit your purpose.

oldIndex = find(values==1);
newIndex = unique([oldIndex-2; oldIndex-1; oldIndex; oldIndex+1; oldIndex+2]);
values(newIndex) = 1;