# [R] coping zeros from matrix to another

arun smartpink111 at yahoo.com
Sun May 19 23:48:05 CEST 2013

```May be this helps:

set.seed(28)
mat1<- matrix(sample(0:50,20,replace=TRUE),nrow=5)
A<- dist(mat1)
A[2:4]<- 0
set.seed(35)
mat2<- matrix(sample(1:50,20,replace=TRUE),nrow=5)
B<- dist(mat2)
B[which(A==0)]<-0
B
#         1        2        3        4
#2 49.07138
#3  0.00000 28.19574
#4  0.00000 55.70458 33.25658
#5  0.00000 41.97618 31.35283 24.55606
A.K.

----- Original Message -----
From: eliza botto <eliza_botto at hotmail.com>
To: "r-help at r-project.org" <r-help at r-project.org>
Cc:
Sent: Sunday, May 19, 2013 5:05 PM
Subject: [R] coping zeros from matrix to another

Dear useRs,i have two distance matrices A and B. The distances in A are linked with distances in B. What i want to do is the following...There are some points in A where distances are zero(those points are apart from usual diagonal of zero values).Whereas, in B the distances at those points are not necessarily zeros . i want "0" at those points in B where distance in A is zero. How can i do that??i hope my question is clearthanks indeed in advance,Eliza
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