Re: Types in Mathematica thread

*To*: mathgroup at smc.vnet.net*Subject*: [mg62837] Re: Types in Mathematica thread*From*: Bill Rowe <readnewsciv at earthlink.net>*Date*: Tue, 6 Dec 2005 00:43:05 -0500 (EST)*Sender*: owner-wri-mathgroup at wolfram.com

On 12/5/05 at 3:37 AM, hattons at globalsymmetry.com (Steven T. Hatton) wrote: >>4. There are other built in type tests that rely on other tests >>than Head: NumberQ, NumericQ, IntegerQ, EvenQ, OddQ, PrimeQ; >>ArrayQ, VectorQ, MatrixQ (for these there are nice element tests, >>too), PolynomialQ (element tests). There are built in "structural" >>tests, and I mention these for the reason mentioned next: SameQ, >>UnsameQ, OrderedQ, MemberQ, FreeQ, MatchQ, ValueQ, AtomQ. With >>these, argument-testing syntax is f[x_?testQ]. q.v. Section 2.3.5. >RealQ? Ironically that one seems to be missing. Probably an >intentional ommission. Perhaps. But it is easily added should you want a test for reals using the same syntax, e.g., RealQ[x_]:=Element[x,Reals] will do the trick quite nicely. -- To reply via email subtract one hundred and four