Find and replace values in matrix with the value from row 2

Question

I have a matrix with of 1's and 0's. I want to replace all the 1's by an identifier code for that row (the identifier code is given in row 2)

I tried:

dax[,2:109] <- replace(dax[,2:109],dax[,2:109]==1,dax[2,])

but this isn't working right. I've tried to set up a loop, but I've had no success so far.

I'm new to R. Any help is appreciated

Can you provide a [reproducible example](http://stackoverflow.com/questions/5963269/how-to-make-a-great-r-reproducible-example)? What "isn't working right" about this? — gung - Reinstate Monica, Nov 10 '13 at 15:00
Yes, Marc, the 1s and 0s are from row 3 onwards. Here is an example: — lever, Nov 10 '13 at 21:23
sorry about the formatting. trying to figure out how to post my code of the reproducible example — lever, Nov 10 '13 at 21:35

score 0 · Accepted Answer · answered Nov 10 '13 at 16:08

0

This may do it for you, although it'd be nice to get more details from you.

for(j in 2:109) dax[dax[,j]==1,j] <- dax[2,j]

answered Nov 10 '13 at 16:08

Carl Witthoft

1 Answers1