Currently in class, I am learning about matrices. There is a particular problem I just can't crack. The problem had me create a matrix such as this:
m=matrix(seq(2,48,2),nrow=6,ncol=4)
Which returns this:
[,1] [,2] [,3] [,4]
[1,] 2 14 26 38
[2,] 4 16 28 40
[3,] 6 18 30 42
[4,] 8 20 32 44
[5,] 10 22 34 46
[6,] 12 24 36 48
From here, I have to create another matrix using m that will return the following numbers in a matrix: 28,30,36,38,44,46. Ideally returning something like this:
[,1] [,2]
[1,] 28 38
[2,] 30 44
[3,] 36 46
I've thought about just indexing each number individually, but I am struggling to have R return more than one number. How would I go about doing this? Thank you!
If it is custom values, then index to get the values and convert to matrix
matrix(m[c(14:15, 18, 19, 22, 23)], ncol=2)
# [,1] [,2]
#[1,] 28 38
#[2,] 30 44
#[3,] 36 46