seeking advice for manipulating matrices to find the difference

Uwe,
 Thanks. I have used merge a lot, but I didn't realize you could merge on 
row names. I got it working now:
 test <- merge(out.r[1:5, 1:3], out.p[1:5, 1:3], by="row.names", all.x=TRUE)
 Thanks,
Roger


 On 8/30/05, Uwe Ligges <ligges at statistik.uni-dortmund.de> wrote: 

roger bos wrote:

I have two matrices (see example below) and I want the differences for 

the

matching row numbers, but the row numbers are not identical in the two
matrices. There are probably many ways to do this. Anyone know of any 

easy

way to do this? I could loop over them, but you know what they say about 

for

loops... Thanks, Roger

For example merge() by row numbers and calculate the differences in the
next step.

Uwe Ligges

out.r[1:5, 1:3]

1 2 3
1100 -0.0992 -0.0802 -0.0653
1200 -0.1242 -0.0417 0.0082
1300 -0.1681 -0.0211 -0.0958
1400 -0.0985 -0.1217 0.0026
1500 -0.0318 -0.0437 -0.0302

out.p[1:5, 1:3]

1 2 3
1100 -0.0564 -0.0573 -0.0224
1200 0.0528 -0.1134 -0.1186
1400 -0.0144 -0.1079 NA
1500 0.0919 -0.0371 -0.1602
1600 NA NA NA

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