On Thu, Apr 28, 2011 at 1:13 PM, Pau <vim.u...@googlemail.com> wrote:
> Hi,
>
> I am trying to "grep" in 650 data files a row which has a particular
> number on column 2, namely " 0.250000000000000E+00 ".
>
> Alternatively, I could look for that row by searching for the first
> column, which is " 1 ".
>
> Unfortunately, this row changes position in the 650 files and looks like
> this:
>
> -----------
> .
> .
> .
> 4224 0.249999993684469E-04 0.450621747970581E+01
> -0.217168951034546E+01 0.798277109861374E-01 -0.598546504974365E+00
> -0.947211563587189E+00 0.298483103513718E+00 0.694457411766052E+00
> -0.135573709011078E+01 0.500285959243774E+01 0
> 4225 0.249999993684469E-04 0.503941202163696E+01
> -0.236623978614807E+01 -0.171467363834381E+00 -0.204598993062973E+00
> -0.764434099197388E+00 0.354671090841293E+00 0.141895398497581E+00
> -0.693929433822632E+00 0.556993389129639E+01 0
> 4226 0.249999993684469E-04 0.403050041198730E+01
> -0.215032029151917E+01 0.877652913331985E-01 -0.991083562374115E+00
> 0.611193120479584E+00 0.273028463125229E+00 0.364663577079773E+01
> -0.221709823608398E+01 0.456908226013184E+01 0
> 1 0.250000000000000E+00 0.417827463150024E+01
> -0.208329892158508E+01 0.104015089571476E+00 0.154748081695288E-02
> -0.619542039930820E-02 -0.361486850306392E-02 0.216096282005310E+01
> -0.701378881931305E+00 0.467000341415405E+01 0
> 4228 0.249999993684469E-04 -0.348412361145020E+02
> -0.309311046600342E+02 -0.551393890380859E+01 -0.908447951078415E-01
> -0.427876152098179E-01 -0.533953774720430E-02 0.295748591423035E+01
> -0.196792855858803E-01 0.469153327941895E+02 0
> 4229 0.249999993684469E-04 0.427954912185669E+01
> -0.195016658306122E+01 0.785302296280861E-01 0.806781768798828E+00
> -0.110497450828552E+01 -0.624167263507843E+00 0.235030865669250E+01
> -0.216405773162842E+01 0.470360040664673E+01 0
> 4230 0.249999993684469E-04 0.551125669479370E+01
> -0.394835329055786E+01 0.588055849075317E+00 -0.504932820796967E+00
> 0.104279957711697E+00 -0.213553920388222E+00 0.198102459311485E+00
> -0.341262459754944E+00 0.680509042739868E+01 0
> .
> .
> .
> -------------
>
> The purpose is to identify the row and then plot the 3rd and 4th
> columns once that row has been identified:
>
>
> X_inst = FILE[????:, 2] # Column 3
> Y_inst = FILE[????:, 3] # Column 4
>
> My problem is how to define those ????
>
> thanks a lot,
>
> Pau
>
>
This is more of a numpy problem than a matplotlib problem. I would suggest
asking on numpy's mailing list.
Ben Root
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