filter

0     0     Edited Sep 1, 2015

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Alias: nulliffalse

Usage:
[vector]x ← filter( [vector]expr, [vector]test )

Returns a vector x where:
x_i is set to expr_i when test_i evaluates to true or 1.
x_i is set to null when test_i evaluates to false, 0 or null.

Examples:
filter(Q1, country==1)
filter(Q1, (country==1)==false)
filter(Q1, and(country==1, gender==1))
filter(Q1, or(segment==1, segment==2, segment==3))

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