Symbolic Math Library in C/C++/Obj-C [closed] - c++

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I am trying to implement a graphing calculator on the iPhone. I am looking for a library that can take strings of expressions or functions and let me manipulate them (find derivatives, intercepts, zeros, etc). Does anything like this exist?

There's GiNaC for C++. GPL-licensed and actively maintained, last update only a month ago. I found old links to many others that don't seem to exist anymore; perhaps people simply found it easier to use GiNaC?

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How to optimize multiple numbers into a single short string and then reconvert back? [closed]

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I forgot the name, but sometime back I had come across a Javascript library which would take multiple integers as input and then return a very optimized string. This string can be reconverted back to those multiple integers when needed.
Is there any such library in C++ which does that?
After browsing the old code in Javascript, I found our that the library which I came across was Hashids and it has C++ support as well.

Boost::Spirit mini_c tutorial [closed]

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Is there any tutorial describing mini_c example from boost::spirit? It looks as good example of using grammar from boost::spirit::qi, but it's rather complex one and some guide through the code would be helpful.
None that I know of. However, the mini_c example is step 9 in a series of calculator examples. Therefore, if you start working from calc1.cpp up to mini_c (or even the new 'conjure' examples now added to SVN) you shouldn't have a hard time understanding what's going on.

API for real time analysis of Twitter feed? [closed]

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I wanted to know if there are any existing API's used to evaluate any pattern or something out of the real-time twitter feeds?
I'm looking for any API's/Web Services that could work with .NET
Thank You.
http://datasift.net/ does that to some extent (but you'll need to apply to be an alpha tester).
I've used it and it's pretty good.

What is the best development estimate template you've found? [closed]

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I've been putting a fair number of estimates together lately and I'd like to see if I can get a more thorough and - to be honest - better presented estimate document.
Do you have a template that you use regularly that's available online or is there particular content or presentation that you believe is important to include?
Never mind. I've gone and written my own. Hopefully I'll get feedback on how it might best be improved.
Excel Software Estimate Template

XML-RPC library for C++ [closed]

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What libraries are available for writing xml-rpc clients in native C++ or C?
You might want to check out either xmlrpc-c or xmlrpc++.
I found a list of xml-rpc implementations in many different languages. Hopefully this list will be useful to others.