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applyop

apply a function to specified operand(s) of an expression

 

Calling Sequence

Parameters

Description

Examples

Calling Sequence

applyop( f, i, e )

applyop( f, i, e, ..., xk, ...)

Parameters

f

-

function

i

-

specifies the operand(s) in e

e

-

expression

x[k]

-

optional arguments to f

Description

• 

The applyop command manipulates the selected parts of an expression. The first argument, f, is applied to the operands of e specified by i.

• 

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 x+y+z, applyop( f, 2, e) computes x+fy+z.

• 

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.

• 

If i is a set, f is applied simultaneously to all operands of e specified in the set. Note: applyop( f, {}, e) returns e.

• 

Any additional arguments xk are passed as additional arguments to f in the order given.

Examples

py22y3

p:=y22y3

(1)

applyopf,2,p

y2+f2y3

(2)

applyopf,2,p,x1,x2

y2+f2y,x1,x23

(3)

applyopf,2,2,p

y22fy3

(4)

applyopf,2,3,p

y2+f2y+f3

(5)

applyopabs,2,1,3,p

y2+2y+3

(6)

ez+1lnzz22

e:=z+1lnzz22

(7)

expande

lnzz22z+lnzz22

(8)

To expand the argument to the logarithm in e:

applyopexpand,2,1,e

z+1lnz32z

(9)

To factor the argument to the logarithm in e over R:

applyopfactor,2,1,e,real

z+1lnzz+1.414213562z1.414213562

(10)

See Also

map

op

subsop

 


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