Hello, 

I was trying to replace some values in a data matrix using their index as a 
reference by NA.
Say i have the following data matrix

mydata

1 2 3 4 1 6
2 3 4 5 6 6
3 5 6 2 7 0

and i have also 
myindices
1 2
1 5
3 5

that refers to the data values above, for example 1 2 means that row 1 and 
column 2, that has a value of 2 in mydata, 1 5 means the value 1 in the first 
row and 5th col.

I want to replace those index values as in "myindices" from "mydata" by NA's.

Is there anyone who can suggest me as to how to do this, please?

Thank you

Daniel



      
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