how to import large data file into matlab
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I have very large data 5GB space delimited mixed data (data.prn) with column header:
*0000*
*0000*
al 10.598010201 1.890025647
am 11.222025789 -5.369021654
as -10.256862254 11.235854322
at 14.589056356 15.888792312
. .
. .
I know it has three column but i don't know exactly the number of rows since the data is to large to open. My target is to plot data(:,1) vs data(:,2). Any suggestion which command is fast to import the data to matlab.Thanks!
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Walter Roberson
2015년 7월 16일
fid = fopen('data.prn', 'rt');
datacell = textscan(fid, '%*s%f%f', 'HeaderLines', 2);
fclose(fid);
plot(datacell{1}, datacell{2})
However, keep in mind that your screen only has a few thousand pixels, not billions, so you are going to end up with multiple data points per pixel, which will be slow and of no good visual purpose. You should consider plotting only a subset of the data, such as
plot(datacell{1}(1:1000:end}, datacell{2}(1:1000:end))
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