Function: math[_Zval] - transform an expression containing _Zn's into a sequence of values
Calling Sequence:
_Zval(expr, r);
Parameters:
expr - an expression or list or set of expressions containing the name _Z n , where n is a posint
r - a range of type realcons .. realcons
Description:
With trigonometric expressions, solve returns a general solution including the names _Z1, _Z2, etc., which are placeholders for integers, if _EnvAllSolutions has been set true. By passing this general solution expr and a range r, r specifying an interval x1 .. x2, _Zval transforms this expression into a sequence of values which lie in the interval [x1, x2].
This function is part of the math package, and so can be used only after performing the command with(math) or with(math, _Zval).
Examples:
> with(math, _Zval):
> _EnvAllSolutions := true:
> sol1 := solve(cos(x)=0, x);
> _Zval(sol1, -3*Pi .. 3*Pi);
> evalf(%);
> sol2 := solve(sin(x)*cos(x)=0, x);
> _Zval({sol2}, -10 .. 10);
See Also:
solve .
Version History:
Version 1.0 as of January 02, 1998
Version 1.1 as of February 14, 1998