Hello,
It's not working because you are changing mat1 before the second
condition is evaluated, and so mat1 is full of NA values. Try the following.
tmp <- mat1 # Make a copy
tmp[mat1 < 1 & mat2 < 1] <- NA # And change that copy
mat2[mat1 < 1 & mat2 < 1] <- NA
mat1 <- tmp
rm(tmp)
Hope this helps,
Rui Barradas
Em 03-07-2013 22:27, JiangZhengyu escreveu:
Dear R experts,
I have two matrices (mat1 & mat2) with the same dimension & the cells (row and
column) are corresponding to each other.
I want to change cell values to NA given values of the corresponding cells in mat1
and mat2 are both <1.
E.g. both mat1[2,3] and mat2[2,3] are <1, I will put mat1[2,3]=NA, and mat2[2,3]=NA;
if either mat1[2,3]>=1 or mat2[2,3]>=1, I will save both cells.
I tried the code, but not working. Could anyone can help fix the problem?
mat1[mat1<1&mat2<1]=NA
mat2[mat1<1&mat2<1]=NA
mat1=matrix(rnorm(12),3)
mat2=matrix(rnorm(12),3)
mat1
[,1] [,2] [,3] [,4]
[1,] -1.3387075 -0.7142333 -0.5614211 0.1846955
[2,] -0.7936087 -0.2215797 -0.3686067 0.7328731
[3,] 0.6505082 0.1826019 1.5577883 -1.5580384
mat2
[,1] [,2] [,3] [,4]
[1,] 0.4331573 -1.8086826 -1.7688123 -1.4278934
[2,] -0.1841451 0.1738648 -1.1086942 1.3065109
[3,] -1.0827245 -0.4143808 -0.6889405 0.4046203
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