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reading large multicolumn data file [message #72145]

Thu, 05 August 2010 16:54

bio_amateur
Messages: 7
Registered: August 2010

Junior Member

I have a data file (a few hundreds MB). This is a text file in the
format X Y1 Y2 Y3 (first column is the common x-axis data, next
columns are data). I can read the data and plot easily with xmgrace
using

xmgrace -nxy data.dat

which take a few seconds to plot. Now, I want to use IDL to read this
file and display using iTool. What I did was

data = read_ascii(filename)
myPlotData = data.(0)
rows = (size(myPlotData, /dimension))[0]
for ii=1, rows do begin
iPlot, myPlotData[0,*], myPlotData[ii,*], /overplot
end

This method takes so long. Could someone good at this can point out a
solution for me.

Thanks,
Tuan

Dept. Bioinformatics and Computational Biology
GMU

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