Ivo Houtzager

Thank you for your suggestions. But I have some remarks:

1) It is not hard coded. If you include the headers "lapack.h" and "blas.h" (see also "factor.h") it will automatically add underscore during preprocessing.

2) I will correct that.

3) For which versions is this?

4) This option is already included in make_factor.m

5) There is already a make_factor.m included for building the mex-files.

PLS is there anyone used this function in signal processing???
If there is anyone could you please refer me to any article who used it in signal processing. This part is important for me to do my thesis so I understand more about this fucntion in signal processing and to put some references.
I couldnt find any

THANKS

Here's how I managed to compile librrqr.a

# first download the package (it is actually a shell script that creates a bunch of files)
wget http://www.netlib.org/netlib/toms/782 -O 782.sh

# remove the top 3 lines with the ACM info
sed -i '1,3d' 782.sh

# replace all $( and $?in the cat areas for makefiles with \$( and \$?to work with newer versions of sh
sed -i 's/\$[\(]/\\$\(/g' 782.sh
sed -i 's/\$[\?]/\\$?/g' 782.sh

# now extract the rrqr_acm directory
sh 782.sh

To compile go into rrqr_acm/lib and run make. You will probably need to first edit the Makefile and change the fortran compiler from f77 to gfortran and add -fPIC to the OPTS. After running make, there should be a file rrqr.a in the rrqr_acm directory. Move this to librrqr.a in the directory with the matlab and c files and now you should be able to compile the mex file.