Displaying 1 result from an estimated 1 matches for "m1x3".
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m13
2013 Oct 15
2
A 'good' way to build a matrix from a sequence of integers?
...:
# I want to understand a 'good' way to build a matrix from a sequence of integers.
# If that question is not clear, here is a longer version:
# Here is what I did for a 1D-matrix:
# I pick the sequence 1:3
# I build a vector:
vec1x3 = c(1:3)
vec1x3
# I transform it into a 1 x 3 matrix:
m1x3 = matrix(vec1x3, c(length(vec1x3),1))
m1x3
# [,1]
# [1,] 1
# [2,] 2
# [3,] 3
# >
# That was easy.
# Next I want to expand from a 1 x 3 matrix to a 2 x 9 matrix
# which contains all combinations of 1:3
# So the first 4 rows would look like this:
# 1 1
# 1 2
# 1 3 I call this a r...