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applyop - apply a function to specified operand(s) of an expression
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Calling Sequence
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applyop( f, i, e )
applyop( f, i, e, ..., xk, ...)
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Parameters
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f
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function
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i
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specifies the operand(s) in e
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e
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expression
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x[k]
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optional arguments to f
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Description
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The applyop command manipulates the selected parts of an expression. The first argument, f, is applied to the operands of e specified by i.
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If i is an integer, applyop( f, i, e) applies f to the ith operand of e. This is equivalent to subsop( i = f(op( i, e)), e). For example, if the value of e is the sum  , applyop( f, 2, e) computes  .
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If i is a list of integers, the call applyop( f, i, e) is equivalent to subsop( i = f(op( i, e)), e). This allows you to manipulate any suboperand of an expression.
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If i is a set, f is applied simultaneously to all operands of e specified in the set. Note: applyop( f, {}, e) returns e.
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Any additional arguments xk are passed as additional arguments to f in the order given.
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Examples
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![applyop(f, [2, 2], p)](/support/helpjp/helpview.aspx?si=4202/file00174/math168.png)
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![applyop(abs, {3, [2, 1]}, p)](/support/helpjp/helpview.aspx?si=4202/file00174/math182.png)
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To expand the argument to the logarithm in e:
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![applyop(expand, [2, 1], e)](/support/helpjp/helpview.aspx?si=4202/file00174/math205.png)
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To factor the argument to the logarithm in e over R:
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![applyop(factor, [2, 1], e, real)](/support/helpjp/helpview.aspx?si=4202/file00174/math214.png)
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