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I have to use LU decompostion to fit a simple model to some data (simulated) in C. An example of what I need to do is here:

However, I'm stuck with a more basic problem: how do I install packages in C and call them in my code?

I'm new in C and I'm used to R. But I have this assingment to do some tests about Matrix inversion, LU decomposision and the professor suggested using Lapack to easy things (thus, I don't need to code myself the LU decomposition etc.). But I don't know how to install the package and call it in my code, in order to use the functions of LAPACK.

I have a windows 7 64 bits and I'm using compiler Code Blocks 8.02

Thanks for any help.

Community
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Manoel Galdino
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3 Answers3

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Normally you don't "install" C libraries in that sense. Normally, in Windows you have three types of files. The header files, typically ending in .h, the dynamic library, .dll, and most likely some linker files (typically, .lib, .a or something). The linker and compiler will need to be able to find these files somewhere. Normally you set the include directory paths, and library directory paths.

E.g. Let's say you downloaded a library called foo, and you extract it to C:\foo. In that folder, libfoo.a, foo.dll and foo.h reside. In Code::Blocks you will have to point include directory path to C:\foo and library path to C:\foo so that the linker and compiler know where to look for these files. Since you're linking against the foo library, you will also have to set -lfoo or something similiar in linker command line. This is GCC syntax, but I think Code::Blocks uses GCC compiler behind the scenes anyways.

In the C code you can just #include <foo.h> and the compiler will find it for you.

Maister
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  • Thanks. It looks like exactly the kind of instruction I needed. I will give it a try and get back here telling if it worked. Thanks again. – Manoel Galdino Jan 19 '11 at 16:36
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You need to install that library and it might actually supply a tool for that. Check their documentation (e.g. a file INSTALL or README in their distributed sources). If the library uses only headers you might only need to copy it's headers to some directory on your system, but their buildsystem might be able to do that for you.

Once that is done you would tell your IDE on where to look for the sources and if the library uses not just headers to link against the actual library file. See the documentation in the Code::Blocks Wiki on how this is done for some example cases and adapt for your library.

Benjamin Bannier
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The simplest thing to do in your situation is to install Cygwin. You can use the setup.exe installer to install the GCC and the LAPACK libraries. When you want to use the LAPACK library, you will add the -llapack option to your GCC command line.

David1235
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