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MathGroup Archive 2004

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Re: help save matrix inside a Loop

  • To: mathgroup at
  • Subject: [mg49588] Re: [mg49553] help save matrix inside a Loop
  • From: Yasvir Tesiram <yat at>
  • Date: Sat, 24 Jul 2004 03:47:18 -0400 (EDT)
  • References: <>
  • Sender: owner-wri-mathgroup at


1. Initialize a vector to hold the results of each iteration. Use 
AppendTo to stuff the results into the vector. Then export. Depending 
on the size of the results this may not be an optimal solution.

2. Alternatively create a list of filenames and tag the Put or Export 
operation to the counter. e.g.

filenames = {a, b, c, d, e};
For[i = 1, i <= Length[filenames], i++,
   result =  i + 1;
   Export["~/Desktop/" <> ToString[filenames[[i]]] <> ".txt", result,  

There  are probably umpteen methods to do this without a For loop.


On Jul 23, 2004, at 4:59 AM, paolo wrote:

> I am generating scenarios of interest rate. Any scenarios is a matrix 
> [[n,m]].
> to generate  multiple scenarios i use a loop "For[ ]". I need to save 
> any matrix
> generated in a file txt.
> How can i include the save command
>    MatrixName >> ".././.nameFile.txt"
> inside the loop
>    For [ ................]
> to save all the matrix in different files????? i.e. if the Loop have 
> 50 steps i
> wish to create 50 file txt each of one is a different scenario.
> The (obvious) problem that i am encoutering is that for any step of 
> the Loop the
> new matrix created will overwrite the previous matrix so at the end of 
> the Loop
> i can "Load" only the file of the last scenario generated!
> Thanks
> Paolo

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