C++ library that imitates matlab's functionality [closed]

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I'm wondering if there any c/c++ libraries out there that imitate the functuonality that matlab offers (neglecting all the toolboxes of course) and if so, how they compare to matlab in both simplicity and speed?

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For standard linear algebra, Armadillo essentially has "ease of use" a la Matlab as a stated goal. Quoting from the main page:

• Armadillo is an open-source C++ linear algebra library (matrix maths) aiming towards a good balance between speed and ease of use. Integer, floating point and complex numbers are supported, as well as a subset of trigonometric and statistics functions. Various matrix decompositions are provided through optional integration with LAPACK, or one of its high performance drop-in replacements (such as MKL or ACML).

• This library is useful if C++ has been decided as the language of choice (due to speed and/or integration capabilities), rather than another language like Matlab ® or Octave. It is distributed under a license that is useful in both open-source and commercial contexts.

It is a pretty decent C++ library.

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There are several libraries that provide basic linear algebra (BLAS) implementations. However, I think you'll find matlab has so many convient functions that get use very frequently you will have a hard time porting your matlab over to c+++ even with a nice BLAS library.

Check out GNU Octave. It provides a runtime that closely mirrors matlab. It also allows you to embed and extend the runtime within your C++ application

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Since you haven't mentioned anything regarding the licensing of the library, you may want to look at this:

http://www.mathworks.com/products/matlab-coder/