Subsets the row by going from high indices to low (the reverse of the supported practice)
rev_row_subset(x, start, end)A matrix of dimensions M x N
A unsigned int that indicates the starting row.
A unsigned int that indicates the ending row.
x A matrix with matrix rows displayed in reversed order
Consider a vector x=[[1,2],[3,4]], the function would output x=[[3,4],[1,2]]. Start and end must be valid C++ matrix locations. (e.g. matrix rows start at 0 and not 1)