Sib-pair Command: <cmd> { ... }

Class	Data Declaration command
Name	<cmd> { ... }
Arguments	...{ (<val1> <val2> ...<valN>) | (<val1> : <val2>) | ($[mxqa]) } ...

Repeat the associated command, placing each value of the iterator list into the position the list currently occupies. There may be multiple iterators, and iterator lists may be nested. A sequence of integers can be specified by start and end values separated by a colon. These macro commands allows a certain amount of the functionality of proper computer languages:

Iteration over a range of numerical values of a function	sml {0.1 0.3 0.5} 1 0 0
Iteration over a range of loci of a function	tab a1 {m1 m2}
Iteration over a range of functions	{tdt ass} a1
Combinatorial generation of strings eg locus names	set loc a{1 : 3}{1 : 3} aff
Compound statements	if (male) then m{1 2}=x

Note that more powerful manipulations are available from the Scheme language by composing the command then using the run procedure.

Example:

>> {1 2} + 1
=> 2.
=> 3.
>> set loc a{b 2 3} aff; ls
ab* a2* a3*
3  active traits;  0  active markers.
>> echo {1 : 3}{3 : 1}
13
12
11
23
22
21
33
32
31