Re: How to test if list of arguments are numeric

*To*: mathgroup at smc.vnet.net*Subject*: [mg89521] Re: How to test if list of arguments are numeric*From*: Albert Retey <awnl at arcor.net>*Date*: Wed, 11 Jun 2008 05:15:41 -0400 (EDT)*References*: <g2nu84$ej1$1@smc.vnet.net>

Michael A. Gilchrist wrote: > Hi all, > > I'm trying to use a function with NMinimize and running into problems with > holding off its evaluation until NMinimize passes real values. Essentially, I > have something like this > > TestFunction[avec_]:=Module[{}, > . > . > . > ] > > Where avec should be a list of real numbers. I know that to ensure avec is a > list I use avec_?ListQ, but I need to ensure that avec is a list of real > numbers (not the symbols that NMinimizes passes). > > Unfortunately, I have no idea what the correct syntax is. Could someone > please clue me in on this? These two should work: ClearAll[avec]; avec[x_?(VectorQ[#,NumericQ]&)]:=Row[{"Match: ",x}] ClearAll[avec]; avec[x:{__?NumericQ}]:=Row[{"Match: ",x}] These were my testcases: avec[1] avec[a] avec[{{}, a}] avec[{1, 2, d}] avec[{1, 2, 3, \[Pi]}] be sure to ClearAll before redefining, otherwise the old definitions will still be active! hth, albert