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Re: READ, adn get data into an array from LARGE SIZE FILES [message #91382 is a reply to message #91380]

Tue, 07 July 2015 19:12

Jeremy Bailin
Messages: 618
Registered: April 2008

Senior Member

On Tuesday, July 7, 2015 at 12:43:49 PM UTC-4, luc...@gmail.com wrote:
> Hello All
> I have a big problem
> I need to open ,read and extract some useful data from big files, I have about 20 files ranging from 189MB to 22GB in size.
> There is a header (first 4 lines or so )
>
> Not all the lines are the same size, want to re-structure the file into an array with only a few data point from each line.
> Like from the first data line I just want the 1000
> From the following line I want to 212
> From the following line I want the 0.80000E+01
>
> So I will write
> 1000 212 0.80000E+01
>
> Then I want
> 3000 122 0.80000E+01
>
> 3000 211 0.75687E+01
>
> 3000 115 0.75687E+01
>
> SKIP 5000 *************
>
> 2015 155 0.17684E+01
>
> SKIP 5000 ***************
>
> 2011 115 0.51101E+00
>
>
> Or something like that
>
> This is an example kind of format the data files are written :
>
> 3 7 9 8 9 8 9 8 9 8 9 0 4 0 0 0 0 0 0 0
> 1 2 3 7 8 9 16 17 18 19 20 21 22 23 24 25 26 27 28 7 8 10 11 16 17 18 19 20 21 22
> 23 24 25 26 27 28 7 8 12 13 16 17 18 19 20 21 22 23 24 25 26 27 28 7 8 10 11 16 17 18
> 19 20 21 22 23 24 25 26 27 28 7 8 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
> 2475 1000 2
> 3000 1 40 3 212 0 0
> 0.40643E+01 -0.93584E+01 0.48473E+01 0.20720E-01 0.90154E+00 -0.43220E+00 0.80000E+01 0.10000E+01 0.00000E+00
> 3000 2 43 25 3 122 6 0
> 0.42219E+01 -0.25000E+01 0.15593E+01 0.20720E-01 0.90154E+00 -0.43220E+00 0.80000E+01 0.10000E+01 0.25422E-01
> 3000 3 44 31 3 211 0 5
> 0.42171E+01 -0.24650E+01 0.15412E+01 -0.83941E-01 0.85475E+00 -0.51220E+00 0.75687E+01 0.10000E+01 0.25555E-01
> 5000 4 117 174 3 115 5 5
> 0.40564E+01 -0.82822E+00 0.56041E+00 -0.83941E-01 0.85475E+00 -0.51220E+00 0.75687E+01 0.10000E+01 0.31955E-01
> 2015 4 2 1 3 115 5 932
> 0.41191E+01 -0.75830E+00 0.55086E+00 0.90458E+00 0.38728E+00 -0.17820E+00 0.99789E-03 0.10000E+01 0.32428E-01
> 5000 7 0 0 3 115 5 1
> 0.43406E+01 -0.74618E+00 0.41210E+00 0.67909E+00 -0.11221E+00 -0.72543E+00 0.17684E+01 0.10000E+01 0.33286E-01
> 2011 7 2 3 3 115 5 1343
> 0.43580E+01 -0.75818E+00 0.39485E+00 0.93607E+00 0.33833E+00 -0.96485E-01 0.99819E-03 0.10000E+01 0.33643E-01
> 5000 10 78000 3 3 115 5 1
> 0.43578E+01 -0.72648E+00 0.41716E+00 0.38784E+00 0.47850E+00 0.78779E+00 0.51101E+00 0.10000E+01 0.33772E-01
> 2013 10 2 5 3 115 5 1049
> 0.43576E+01 -0.72315E+00 0.41485E+00 0.46633E+00 0.88357E+00 -0.43014E-01 0.98065E-03 0.10000E+01 0.33864E-01
> 5000 6 78000 5 3 115 5 1
> 0.43406E+01 -0.74618E+00 0.41210E+00 0.90620E+00 0.13522E+00 -0.40064E+00 0.15462E+00 0.10000E+01 0.33286E-01
> 2011 6 2 7 3 115 5 781
> 0.43403E+01 -0.74631E+00 0.41167E+00 -0.52533E+00 0.65367E+00 0.54475E+00 0.99241E-03 0.10000E+01 0.33303E-01
> 5000 8 78000 3 3 115 5 1
> 0.43402E+01 -0.74649E+00 0.41166E+00 -0.23393E+00 -0.18276E+00 0.95492E+00 0.58210E-02 0.10000E+01 0.33293E-01
> 2011 8 2 9 3 115 5 361
> 0.43402E+01 -0.74649E+00 0.41167E+00 -0.16978E+00 0.60617E+00 0.77700E+00 0.96494E-03 0.10000E+01 0.33293E-01
> 5000 7 78000 3 3 115 5 2
> 0.41530E+01 -0.76214E+00 0.54112E+00 0.15077E+00 -0.36478E+00 -0.91881E+00 0.67048E-01 0.10000E+01 0.32533E-01
> 2014 7 2 11 3 115 5 897
> 0.41530E+01 -0.76206E+00 0.54111E+00 -0.75633E+00 -0.29606E+00 0.58337E+00 0.99668E-03 0.10000E+01 0.32544E-01
> 5000 7 78000 4 3 115 5 1
> 0.41502E+01 -0.76024E+00 0.54159E+00 0.83551E+00 -0.10533E+00 0.53929E+00 0.11567E-01 0.10000E+01 0.32522E-01
> 2011 7 2 12 3 115 5 492
> 0.41502E+01 -0.76025E+00 0.54159E+00 -0.80438E+00 -0.52532E+00 -0.27751E+00 0.98903E-03 0.10000E+01 0.32523E-01
>
> Any idea how to handle this? Please Help?

Write it in C.

Seriously, processing a text file like this that is 22 GB in IDL is not worth it.

-Jeremy.

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[Message index]

		READ, adn get data into an array from LARGE SIZE FILES By: lucesmm on Tue, 07 July 2015 09:43
		Re: READ, adn get data into an array from LARGE SIZE FILES By: Jeremy Bailin on Tue, 07 July 2015 19:12
		Re: READ, adn get data into an array from LARGE SIZE FILES By: Craig Markwardt on Wed, 08 July 2015 11:12

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