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Re: exporting an array

  • To: mathgroup at smc.vnet.net
  • Subject: [mg113801] Re: exporting an array
  • From: Raffy <adraffy at gmail.com>
  • Date: Sun, 14 Nov 2010 06:06:13 -0500 (EST)
  • References: <ibgitf$e7p$1@smc.vnet.net>

On Nov 11, 3:09 am, nt <sagittarius5... at gmail.com> wrote:
> Hi,
>
> I have a question on how to export a matrix. My code generates a
> vector of dimension (200 X 1), and I define:
>
> b = Table[b1[i] /. solution, {i, 1, 200}];
>
> I want to assign counters to these values, and have 1,2,3,.....,200 as
> the first column. Finally I want to export this (200 X 2) matrix to a
> file. I tried the following but they don't work:
>
> Export["file.txt", {i, 1, 2000}, b];
> Export["file.txt", i, b];
>
> I would appreciate it if anyone could suggest a way to do this.
>
> Thanks
> nt

You could just build the desired table when your extracting the
vector:

Export["file.txt", Table[{i, b1[i] /. solution}, {i, 200}]];

Or, you could take your b vector and pair it with an index:

Export["file.txt", Transpose@{Range@Length[b], b}];

Or, you could take the procedural approach:

Export["file.txt", Table[{i, b[[i]]}, {i, Length[b]}]];


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