How can i introduce a function in matlab?

I want introduce the function "mtimesx" in matlab but i don´t know how

I tried it since import file but i have errors

My version is r2008a and i have windows 7

thanks

[TAB]

What do you mean by introduce a function ? Do you want to add function in matlab so it can be run from anywhere ?

Answer 1

[Walter Roberson]

You will need to install a supported compiler; see http://www.mathworks.com/support/compilers/release2008a/

Then at the MATLAB command line, give the command

mex -setup

to select the compiler.

Then, download mtimesx and unzip it into a new directory under your Documents and Settings folder.

In MATLAB, "cd" to that folder and then at the MATLAB command line give the command

mtimesx_build

that should build the program.

After that you might possibly need to use pathtool to add the new directory to your MATLAB path.

Answer 2

[agustin darrosa]

thanks but i have this problem

Build routine for mtimesx
... Checking for PC
... Finding path of mtimesx C source code files
... Found file mtimesx.c in C:\Program Files\MATLAB\R2008a\sys\lcc\mtimesx\mtimesx.c
... Found file mtimesx_RealTimesReal.c in C:\Program Files\MATLAB\R2008a\sys\lcc\mtimesx\mtimesx_RealTimesReal.c
... Opened the mexopts.bat file in C:\Users\Gusa\AppData\Roaming\MathWorks\MATLAB\R2008a\mexopts.bat
... Reading the mexopts.bat file to find the compiler and options used.
... LCC is the selected compiler
... OpenMP compiler not detected ... you may want to check this website:
http://openmp.org/wp/openmp-compilers/
... Using BLAS library lib_blas = 'C:\Program Files\MATLAB\R2008a\extern\lib\win32\lcc\libmwblas.lib'
... Now attempting to compile ...

mex('C:\Program Files\MATLAB\R2008a\sys\lcc\mtimesx\mtimesx.c',lib_blas,'-DCOMPILER=LCC')

it can´t find C:\Program Files\MATLAB\R2008a\sys\lcc\mtimesx\mtimesx.exp
it cant´find C:\Program Files\MATLAB\R2008a\sys\lcc\mtimesx\mtimesx.lib
... mex mtimesx.c build completed ... you may now use mtimesx.

then i introduce:

C = mtimesx(a,b)
??? Undefined function or method 'mtimesx' for input arguments of type 'double'.

what can i do?

[Walter Roberson]

Have you tried with Visual C++ 2005 Express Edition ?

Answer 3

[agustin darrosa]

yes, i installed it and i used mex-setup but i have this error

The mex command failed. This may be because you have already run mex -setup and selected a non-C compiler, such as Fortran. If this is the case, then rerun mex -setup and select a C/C++ compiler

before:

Select a compiler: [1] Lcc-win32 C 2.4.1 in C:\PROGRA~1\MATLAB\R2008a\sys\lcc\bin [2] Microsoft Visual C++ 2005 Express Edition in C:\Program Files\Microsoft Visual Studio 8

[0] None

Compiler: 2

Please verify your choices:

Compiler: Microsoft Visual C++ 2005 Express Edition Location: C:\Program Files\Microsoft Visual Studio 8

Are these correct [y]/n? y

*************************************************************************** Error: The Microsoft Platform Software Development Kit (SDK) was not found.

         Microsoft Visual C++ 2005 Express Edition requires that the SDK is 
         installed properly.  MEX uses the environment variable "MSSdk" to 
         find the SDK.  If it is installed properly, please verify that the 
         environment variable "MSSdk" points to the correct location. 
         Otherwise, install the SDK and try again.

How can i install SDK???

thanks