Matrix Rotation
Rotate matrices for 90, 180, or 270 degrees..
rot90(a, k = 1)
a |
numeric or complex matrix |
k |
scalar integer number of times the matrix will be rotated for 90 degrees; may be negative. |
Rotates a numeric or complex matrix for 90 (k = 1), 180 (k = 2) or 270 (k = 3 or k = -1) degrees.
Value of k is taken mod 4.
the original matrix rotated
a <- matrix(1:12, nrow=3, ncol=4, byrow=TRUE) rot90(a) rot90(a, 2) rot90(a, -1)
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