Example of loading C DLL and performance comparison

The example shows how to load a C DLL and also compares it with Matlab files

Description

This example shows how to load a C DLL into Matlab and make a call to functions it contains. In addition, a C-like M file implementation of the same functionality is included for comparison. Furthermore, a vectorized M file has been added to try to match the performance of the library call.

Files:-
conv.c and conv.h : use these to create the dll called conv.dll

myconvm1 : C-like M file that performs the same thing as myconv in conv.dll

myconvm2 : vectorized M file with performance approaching that of myconv in conv.dll

myscr : script that shows how to load the library and that times the execution times of the different versions

• MATLAB release: MATLAB 7.4 (R2007a)

[J Mac]

Not a bad simple demo, but would be more helpful if it showed passing data back and forth between C dll and Matlab code.

[Maurice Stassen]

I was looking for a simple example on how to use a C DLL in Matlab. This was exactly what I was looking for. No frills just a simple interface example.

[alexander zambrano]

i have several .dll that i want to link to a file.m

[ras red]

dear sir i want to know how can i create a c dll file from c code you give it , and i have three dll created by c charp do you know how can i load their functions to the matlab, i am using matlab2008a

[Milan Pipersky]

Just what I needed to get started. Something like this should be included in the Help pages, which only use an example of MatLab-generated dll, not one generated externally.

If you are using MSVC 7, be sure to start with and "Empty Project" to avoid all the baggage contained in stdafx, etc.

Thank you Vinesh

[Ulf]

Nice that it works for other people... I get the following error message:

??? Error using ==> loadlibrary at 387
Call to Perl failed. Possible error processing header file.
Output of Perl command:
Can not open file conv.i because No such file or directory at C:\Program
Files\MATLAB\R2009a\toolbox\matlab\general\private\prototypes.pl line 34

Seems like this conv.i file is not generated as expected? Using Visual C++ 2008 express edition. Any ideas?

Thanks, Ulf

[yossi kfir]

maybe u forgot to add the dll file?