1. Szabolcs Horvát
  2. BoolEval

Source

BoolEval /

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README

BoolEval is a Mathematica package that helps evaluate conditional expressions on numerical arrays, or filter numerical arrays based on conditions. Is does this without unpacking packed arrays and offers a significant speedup over Select and Cases while maintaining convenient notation. It is particularly useful in conjunction with Listable functions.

See the included notebook file for usage examples.

Inspiration: http://mathematica.stackexchange.com/q/2821/12

Installation

Simply drop BoolEval.m in the directory opened by

SystemOpen@FileNameJoin[{$UserBaseDirectory, "Applications"}]

then load it as

<< BoolEval`

Possible issues

Within BoolEval, the meaning of relational operators (>, >=, ==, etc.) and logical operators (&&, ||, !) is overloaded. Avoid using program code within BoolEval itself.

Thus the following will fail (without errors):

BoolEval[
 Select[Range[100], OddQ[#] || # == 2 &] < 10
]

Instead compute the array first:

array = Select[Range[100], OddQ[#] || # == 2 &];

And use it in BoolEval afterwards:

BoolEval[array < 10]

This slight inconvenience is necessitated by the tendency of Greater, Less, etc. to trigger unpacking.

Feedback

Feedback is welcome at szhorvat at gmail.com.