Simon Slavin wrote:
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.
Something not mentioned, but an alternative solution is to use Postgres 8.4+
(9.1 latest), which lets you do window functions directly in SQL. I know thats
a not-SQLite solution, but it may be the least work to accomplish what you want,
as its still terse/declarational SQL, and its also open source. -- Darren Duncan
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