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Re: Conditions

  • To: mathgroup at
  • Subject: [mg29246] Re: Conditions
  • From: "Allan Hayes" <hay at>
  • Date: Fri, 8 Jun 2001 04:15:33 -0400 (EDT)
  • References: <9fna8p$bih$>
  • Sender: owner-wri-mathgroup at

We can create a function which carries out your instructions for each row
and map it over the rows of m.


If[FreeQ[#,0], Last[#], 0]&/@m


Allan Hayes
Mathematica Training and Consulting
Leicester UK
hay at
Voice: +44 (0)116 271 4198
Fax: +44 (0)870 164 0565

<Yannis.Paraskevopoulos at> wrote in message
news:9fna8p$bih$1 at
> Hi again,
> I've been puzzled by the following problem which I  have to admit it's
> not complicated but yet...
> assume that we have a matrix m with dimensions (RxC) then create a
> vector v, which has value 0 when there is a zero at any point across
> m's row. Otherwise v's value would be equal to the last value of the
> corresponding m row.
> I tried for example:
> I initiated a vector v={a,b}. I had to that as
> Table[If[m[[i,j]]==0,v[[i]]=0,v[[i]]=g[[i,5]]],{i,2},{j,5}];
> v
> Out:= {1,1} when I expected {0,1}
> I also tried
> v:=0 /; g/.x_:>x==0
> v:=Table[g[[i,5]],{i,2}]
> with same results.
> Its obvious to me that I do something stupid but I can't figure it out.
> Any help would be very much appreciated.
> Best regards
> yannis
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