COLREDUCE

Purpose:

Applies the REDUCE function to each column of a table.

COLREDUCE(a, "op", opcode)

a	-	An array with one or more columns.
"op"	-	Optional. A string, the binary operator name.
opcode	-	Optional. An integer, the binary operator function code.

A one-row table with the same number of columns as the input table.

W1: {{1, 2},

{2, 3},

{3, 4}}

W2: colreduce(W1, "+")

returns {{6, 9}} the result of summing each column of W1.

colreduce(ravel({1, 2, 3},{2, 3, 4}), "*")

returns {{6, 24}}

colreduce(ravel({1, 2, 3},{2, 3, 4}), 3)

returns {{6, 24}}

Binary operators include the arithmetic and logical operators. The logical "Exclusive OR" operator is represented by the string "XOR".

The function also accepts an explicit function code instead of an operator string. Either an operator string or function code must be supplied.

The following function codes are supported: