matrix, R - rextester

matrix

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Absolute running time: 0.35 sec, cpu time: 0.65 sec, memory peak: 30 Mb, absolute service time: 0,36 sec

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Error(s), warning(s):

Warning message:
In matrix(data = -1:6, ncol = 4, nrow = 3) :
  data length [8] is not a sub-multiple or multiple of the number of rows [3]

     [,1] [,2] [,3] [,4]
[1,]   -1    2    5    0
[2,]    0    3    6    1
[3,]    1    4   -1    2

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