PURPOSE:
--------
y = shiftu (A, column, shift) moves #column of matrix A upwards
by #shift positions.
INPUT ARGUMENTS:
----------------
'A' is the input matrix. ('A' can be a vector)
'column' is the number of the column to be shifted. If 'column'
is zero, then all columns in the matrix are shifted.
'shift' is the number of positions by which the column is shifted
vertically.
'type' is an optional argument.
The shifted matrix-elements are discarded if this argument
is 0 or is omitted,
then vacated spaces on the bottom are filled with zeroes.
The shifted matrix-elements are retained if 'type' is 1
or any other non-zero value,
then vacated spaces on the bottom are filled with the
shifted column-elements from the top (i.e. "wraparound").
EXAMPLES: A = [1 2 3;
--------- 4 5 6;
7 8 9]
y = shiftu(A,0,1) --> [4 5 6;
7 8 9;
0 0 0]
y = shiftu(A,2,1) --> [1 5 3;
4 8 6;
7 0 9]
y = shiftu(A,2,1,0) --> [1 5 3;
4 8 6;
7 0 9]
y = shiftu(A,2,1,1) --> [1 5 3;
4 8 6;
7 2 9]
y = shiftu(A,0,1,1) --> [4 5 6;
7 8 9;
1 2 3]
B = [1; z = shiftu(B,1,3) --> [4;
2; 5;
3; 0;
4; 0;
5] 0]
SEE ALSO: shiftl, shiftr, shiftd.