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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