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I have an arbitrary expression in a string. Let's say:
y=12*x+34
I will have x or y and I need to solve for the other.
muParser does a brilliant job of solving the first form given x but it and all the other math parsers I've found cannot perform any sort of manipulation to turn the expression into:
x=(y-34)/12 so the other could be solved if I had y instead of x.
Is there a C/C++ library out there that isn't GNU encumbered that can be used to solve this?
It looks like you want to embed a proper CAS. Try GiNaC, if it is not powerful enough, think of embedding Maxima or Axiom (both are very heavyweight and runs on top of Common Lisp).
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I can't search what does the logarithm code look like in C++? What the code of the logarithm function looks like in C++ in the library cmath? Exactly the code. I don't need to figure out how I can get the logarithm. I want to know how this algorithm works.
You would be very disappointed. On modern processors, the C++ compiler inserts the assembly instruction that obtains it from the floating-point ALU. There is no code.
That is implementation specific and therefore can vary from system to system.
Since there are several ways to compute a logarithm, a good book on this kind of algorithm is a good start.
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For a more complex project, I need to compute the approximate, relative distances of objects from two images (from stereo-cameras). Practically what this neat tutorial explains: https://chrisjmccormick.wordpress.com/2014/01/10/stereo-vision-tutorial-part-i/ and with a result like that
Think I shouldn't be reinventing the wheel for this project and since speed is very important (realtime from two videostreams) I'm looking for a native library (preferably in C++ where the whole project is written in) for this task.
Does anyone have a suggestion?
Open source would be greatest but not mandatory.
Huge thanks in advance!
try with LIBELAS library (Library for Efficient Large-scale Stereo Matching).
Best!
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How might one implement data frame in R, Python, and other languages using C++?
In general, data.frame solves a problem which is solved fundamentally differently in C++ (and other languages) – namely via class hierarchies, or, in the simplest case, via a vector of tuples.
Since you haven’t given specifics it’s hard to know what exactly you are after but if it’s ease of computation, Armadillo is a good linear algebra library for C++ (one among many). I haven’t yet found a good statistics framework for C++ – I suggest simply sticking with R for that.
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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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A while ago I found a library that allowed calling individual built-in Perl functions in C++, I cannot find it now.
Can you tell me where I can find it on the net?
Thanks.
You might want to try libperl++. It's still kind of beta, but the part that involves calling perl from C++ has been mature for quite some time. It's much easier to use than the perl API itself.
Full disclosure: I'm the author of libperl++
Read perlembed and Extending and Embedding Perl.
Try the following:
perl xs c++
C::DynaLib