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MathGroup Archive 1990

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Re: Ignorance

  • To: MATHGROUP at yoda.ncsa.uiuc.edu
  • Subject: Re: Ignorance
  • From: don at kinghorn.chem.WSU.EDU (Don Kinghorn)
  • Date: Sat, 27 Oct 90 13:40:37 PDT

Begin received message:
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 Dear mathgroupers,
I have a function defined like this:
MatrixB[x_List]:=Block[{tt={x},z,i,n,zoo},
n=x[[1]]/2;
zoo=x;
z=Table[0,{i,Length[x]}];z[[2]]++;
For[i=1,i<=n-x[[2]],i++,tt=AppendTo[tt,zoo=zoo+z]];tt
]
It is probably a bad example of Mathematica programming, but anyway it
does what I want: taking as input a vector it builds an appropriate matrix.
Now it would be interesting if it accepted as input a list of vectors,
giving as result the matrix of the matrices resulting from the analisys of
each element of the input. How must I modified my code? Thank you in
advance for your help.

Riccardo Rigon
(an absolute beginner)
RIGON at iveuncc.bitnet
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

It looks to me like your code could be greatly simplified as follows;

MatrixB[x_List]:=Table[x/. x[[2]]->x[[2]]+i, {i,0,Floor[ x[[1]]/2 - x[[2]] ]} ]

at least I think this is what you want.

In answer to your question, you can apply functions to lists by using Map.
For example;

Map[ MatrixB, { list1,list2,list3} ]

should do what you want. 


I hope this helps. :-) 

Don Kinghorn
Washing State University
Chemical Physics Dept.
don at kinghorn.chem.wsu.edu


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