HP 49g+ - Manual (Page 315)

Page 10-19
decomposed in columns. To see the full result, use the line editor (triggered
by pressing
˜).
In RPN mode, you need to list the matrix in the stack, and the activate function
COL, i.e., @@@A@@@ COL. The figure below shows the RPN stack before and
after the application of function COL.
In this result, the first column occupies the highest stack level after
decomposition, and stack level 1 is occupied by the number of columns of the
original matrix. The matrix does not survive decomposition, i.e., it is no
longer available in the stack.
Function COL→
Function COL → has the opposite effect of Function → COL, i.e., given n
vectors of the same length, and the number n, function COL builds a matrix
by placing the input vectors as columns of the resulting matrix. Here is an
example in ALG mode. The command used was:
COL ([1,2,3],[4,5,6],[7,8,9],3)
In RPN mode, place the n vectors in stack levels n+1, n, n-1,…,2, and the
number n in stack level 1. With this set up, function COL places the vectors