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selectfun - selects for a specified function
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Calling Sequence
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selectfun(e, f)
selectfun(e, f, x)
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Parameters
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e
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expression
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f
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name, or list or set of names; function name(s)
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x
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(optional) name, or list or set of names; variable name(s)
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Description
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The selectfun command searches an expression e for the function with operator name f, or, if f is a list or set of names, then selectfun searches e for any one of these functions.
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It returns a set consisting of all the matching subexpressions g of e such that either op(0,g)=f or member(op(0,g),f) according to whether f is a name or is a list or set of names.
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If the optional third argument x is specified, the selectfun command requires the subexpressions g be function(s) f of x (or function(s) f of a member of x if x is a set or list).
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Examples
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![selectfun(e, exp, [x, y])](/support/helpjp/helpview.aspx?si=9308/file00517/math146.png)
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