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R: How to sum pairs in a Matrix by row?

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臣服心动
臣服心动 2021-01-23 02:54

Probably this would be easy. I have a Matrix:

testM <- matrix(1:40, ncol = 4, byrow = FALSE)
testM
      [,1] [,2] [,3] [,4]
 [1,]    1   11   21   31
 [2,]
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  • 孤街浪徒
    孤街浪徒 (楼主)
    2021-01-23 03:22

    How about:

    matrix(c(testM[, 1] + testM[, 2], testM[, 2] + testM[, 4]), nrow = 10)

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