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Re: [Help-gsl] Reading data from a file to a vector

From: Kevin Channon
Subject: Re: [Help-gsl] Reading data from a file to a vector
Date: Tue, 27 Jan 2009 14:45:30 +0000

Hi Ivan

> What I want to do is reading a plain text file with data in the format
> x1 y1
> x2 y2
> ... and such

If you definitely have the file in this format and you don't mind
using C++ instead of C, then you can read these files really easily
with something like,


double var1, var2;
std::ifstream myFile("filename.txt", std::ios::in);
/* read the two elements one row at a time */
   myFile << var1 << var2;
/* Insert stuff to get var1 and var2 into the right elements of the
gsl_vector here */


Obviously, there should be error checking and stuff, but that's the basic idea.

Have fun


Kevin Channon

School of Chemistry
University of Bristol

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