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solvelib::getElement -- get one element of a set

Introduction

solvelib::getElement(S) returns an element of S.

Call(s)

solvelib::getElement(S)

Parameters

S - any set

Returns

solvelib::getElement returns a MuPAD object representing an object of S, or FAIL if no element could be determined.

Overloadable:

S

Related Functions

solve

Details

Example 1

If S is a finite set, just one of its elements is returned.

>> solvelib::getElement({2, 7, a})
                                     a

Example 2

For image sets, an element is obtained by replacing every parameter by a constant.

>> S:=Dom::ImageSet(k*PI, k, solvelib::BasicSet(Dom::Integer)) 
                           { X1*PI |  X1 in Z_ }
>> solvelib::getElement(S)
                                     0

Example 3

solvelib::getElement may fail to find an element of a set although that set is not empty.

>> solvelib::getElement(solve(exp(x)+x=0,x))
                                   FAIL

Changes




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