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MathGroup Archive 2001

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Conditions

  • To: mathgroup at smc.vnet.net
  • To: mathgroup at smc.vnet.net
  • Subject: [mg29240] Conditions
  • From: Yannis.Paraskevopoulos at ubsw.com
  • Date: Thu, 7 Jun 2001 01:14:46 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

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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