[Date Index]
[Thread Index]
[Author Index]
Re: IsExact
*To*: mathgroup at smc.vnet.net
*Subject*: [mg80546] Re: IsExact
*From*: Albert <awnl at arcor.net>
*Date*: Sun, 26 Aug 2007 02:55:29 -0400 (EDT)
*References*: <falsi4$gfh$1@smc.vnet.net>
carlos at colorado.edu wrote:
> Let c be a 1D list of scalar coefficients, numeric or symbolic,
> real or complex. No entry is a list. Examples:
>
> ClearAll[n,x,y,a,a1,a2,b,r];
> c1={1,2*I/5,E^(25*n),3/4+I,Cos[n*x*Pi],y*Sqrt[-5]};
> c2={a/b,r+2/5,a1,,,,,a2};
> c3={1.5,0,Sqrt[3],0,4};
> c4={(r+0.5)/3,3/7,3+Sin[4*x*y]};
> c5={1,2,3,4,5,6}+0.0;
> c6={N[x]};
>
> I need a function IsExact[c] that returns False if
> at least one entry of c is floating, or if it contains one
> floating number; else True. For example, tests on
> c1 and c2 should return True; the others False.
>
my 2 cent:
IsExactQ[x_] := (Length[Cases[x, _Real, Infinity]] == 0)
it doesn't get the last one right, if x is not set to any value. But
this will not be possible, since c6 doesn't know anything about N having
been applied to x...
hth,
albert
Prev by Date:
**Cell brackets on left ?**
Next by Date:
**ExportString[NumberForm@5,"MathML","Semantics"->False]**
Previous by thread:
**Re: IsExact**
Next by thread:
**Re: IsExact**
| |