On 27 Mar 2012, at 11:50pm, Simon <turne...@gmail.com> wrote:

> Thank you all very much for all your answers, they have been most useful.

You're welcome.  Something else to consider is whether you should be doing this 
in C.  C++ can do everything, but it's not ideally suited to heavy mathematical 
operations.  You might want to consider using R (a free Matlab-like system 
available for pretty-much every OS) which already has a ton of mathematical and 
graphical functions:

<http://www.r-project.org>

I can tell you from experience, writing code to extract, rearrange, analyse and 
plot data is /far/ faster in R than it is in C, even if you don't know R very 
well.  R has a package RSQLite which gives it access to data stored in SQLite 
databases.  So you could write your data-gathering code in C, use that to feed 
the data into an SQLite database, then use R to do your analysis.  You might 
like to take a look at this:

<http://www.r-bloggers.com/slides-“accessing-databases-from-r”-rstats/>

If you're using C because you already have something else you want to interface 
with, sorry for wasting your time.

Simon.
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