GAP (HAP commands) - Chapter 37: Parallel Computation - Extra Functions

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37 Parallel Computation - Extra Functions
37.1
37.1-1 ChildFunction
37.1-2 ChildRead
37.1-3 ChildReadEval
37.1-4 ParallelList

### 37 Parallel Computation - Extra Functions

#### 37.1

##### 37.1-1 ChildFunction

`‣ ChildFunction`( str, s ) | ( function )

This runs the GAP function str="function(arg);" on a child process accessed by the stream s. The output from "func;" can be accessed via the stream.

Examples:

##### 37.1-2 ChildRead

`‣ ChildRead`( s ) | ( function )

This returns, as a string, the output of the last application of ChildFunction("function(arg);",s).

Examples:

##### 37.1-3 ChildReadEval

`‣ ChildReadEval`( s ) | ( function )

This returns, as an evaluated string, the output of the last application of ChildFunction("function(arg);",s).

Examples:

##### 37.1-4 ParallelList

`‣ ParallelList`( I, fn, L ) | ( function )

Inputs a list I, a function fn such that fn(x) is defined for all x in I, and a list of children L. It uses the children in L to compute List(I,x->fn(x)). (Obviously the function fn must be defined on all child processes in L.)

Examples: 1 , 2

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