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Re: How to deal with big matrix?

  • To: mathgroup at smc.vnet.net
  • Subject: [mg116638] Re: How to deal with big matrix?
  • From: Szymon Roziewski <szymon.roziewski at gmail.com>
  • Date: Tue, 22 Feb 2011 04:44:31 -0500 (EST)

Hi,

Thank you for all of  you.

Your resolutions work well.

Kind regards,
Szymon Roziewski

2011/2/22 Bob Hanlon <hanlonr at cox.net>

>
> data = Table[{x[i, j], y[i, j]}, {i, 3}, {j, 4}]
>
> {{{x[1, 1], y[1, 1]}, {x[1, 2], y[1, 2]}, {x[1, 3],
>   y[1, 3]}, {x[1, 4], y[1, 4]}}, {{x[2, 1], y[2, 1]}, {x[2, 2],
>   y[2, 2]}, {x[2, 3], y[2, 3]}, {x[2, 4], y[2, 4]}}, {{x[3, 1],
>   y[3, 1]}, {x[3, 2], y[3, 2]}, {x[3, 3], y[3, 3]}, {x[3, 4],
>   y[3, 4]}}}
>
> Flatten[data[[All, All, 1]], 1]
>
> {x[1, 1], x[1, 2], x[1, 3], x[1, 4], x[2, 1], x[2, 2], x[2, 3],
>  x[2, 4], x[3, 1], x[3, 2], x[3, 3], x[3, 4]}
>
> Flatten[data[[All, All, 2]], 1]
>
> {y[1, 1], y[1, 2], y[1, 3], y[1, 4], y[2, 1], y[2, 2], y[2, 3],
>  y[2, 4], y[3, 1], y[3, 2], y[3, 3], y[3, 4]}
>
>
> Bob Hanlon
>
> ---- Szymon Roziewski <szymon.roziewski at gmail.com> wrote:
>
> =============
> Hello there,
>
> I have quite big matrix with let say 1000 rows and 1100 columns.
> Each of element of this matrix is a point on a surface e.g. {1.232,12.123}
> How can I quickly get first element of each point for whole matrix and put
> it in a vector (1000*1100 - this will be a length of that vector) without
> do
> it in a nested loop (Do[Do[...]])?
> And the similar to get the second element of each point into vector.
>
> kind regards,
> Szymon Roziewski
>
>


-- 
Z wyrazami szacunku,
Szymon Roziewski

Bob Hanlon<br>


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