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## The compose Command

The compose command is used to create vectors. It has two forms:

compose vecname param = value [...]
or

compose vecname values value [...]
Both forms of this command create a new vector called vecname. In the first form, the values in the vector are determined by the parameters given, as described below. In the second form, indicated by the keyword ``values'', the given values are used to form the vector.

In the first form, there are three groups of possible parameter sets. The first set facilitates creation of uniform arrays. This set contains the following parameters.

 start The value at which the vector should start stop The value at which the vector should end step The difference between successive elements lin The number of points, linearly spaced log The number of points, logarithmically spaced dec The number of points per decade, logarithmically spaced

The words ``len'' and ``length'' are synonyms for ``lin''. A subset of these parameters that provides the information needed is sufficient. If all four are given, the point count and step value must be consistent or the command will fail. The parameter start defaults to zero, unless implicitly set by other parameters. The stop and step have no defaults and must be supplied unless implied by other parameters. If the lin parameter is not given, the other parameters determine the vector length.

The second parameter group generates Gaussian random values.

 gauss The number of points in the gaussian distribution mean The mean value for the gaussian distribution sd The standard deviation for the gaussian distribution

The gauss parameter is required, sd defaults to 1.0, and mean defaults to 0. The random number sequences can be reset by calling the seed command.

The third parameter group generates uniform random values.

 random The number of randomly selected points center Where to center the range of points span The size of the range of points

The random parameter is required, span defaults to 2.0, and center defaults to 0. The random number sequences can be reset by calling the seed command.

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Stephen R. Whiteley 2019-03-16