[Help-gsl] Error message during compile - Versions 1.8 & 1.7
I have gone through the installation process for both v1.8 and v1.7 as
laid out in the file INSTALL that came with each distribution. I used
the option --prefix=/home/P05/stennetm/gsl as I could not write to the
default directory.
I then tried to compile a C++ program which makes use of the evolving
solver in almost exactly the same way as is done in the example in the
manual. I used the command 'g++ -L/home/P05/stennetm/gsl/lib -lgsl
-lgslcblas -lm -I/home/P05/stennetm/gsl/include three.cc' and got the
following errors:
/tmp/ccngDDtB.o(.text+0x11e): In function `main':
: undefined reference to `gsl_odeiv_step_rk8pd'
/tmp/ccngDDtB.o(.text+0x13b): In function `main':
: undefined reference to `gsl_odeiv_step_alloc'
/tmp/ccngDDtB.o(.text+0x15e): In function `main':
: undefined reference to `gsl_odeiv_control_y_new'
/tmp/ccngDDtB.o(.text+0x17b): In function `main':
: undefined reference to `gsl_odeiv_evolve_alloc'
/tmp/ccngDDtB.o(.text+0x45d): In function `main':
: undefined reference to `gsl_odeiv_evolve_apply'
collect2: ld returned 1 exit status
I then tried enclosing the headers in extern "C" {} braces and disabling
the shared libraries, none of which made any difference. I'm running
Fedora Core 3 with g++ version 3.4.4. Is there anything I should be
doing to get this to work?
The full code for the C++ program is available on request as are any
more details that might be required.
___
Help-gsl mailing list
Help-gsl@gnu.org
http://lists.gnu.org/mailman/listinfo/help-gsl
[Help-gsl] Error handling
Hello, I've problems understanding the error handling stuff of gsl. What I want to execute code like the following: double x = 9e307; int result; gsl_matrix A, B; A = gsl_matrix_alloc(1, 2); B = gsl_matrix_alloc(1, 2); gsl_matrix_set(A, 0, 0, x); gsl_matrix_set(A, 0, 1, 1); gsl_matrix_memcpy(B, A); result = gsl_matrix_add(A, B); The last line will overflow for element (0, 0) so I'd like to see the value of A = [Inf, 3] and I expected result == GSL_EOVRFLW. I wonder how I can compile my app and setup gsl to get this behavior, because I already played with gsl_ieee_set_mode, but then I get an OS signal which I don't like. Thanks in advance for any hint. Raphael ___ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
Re: [Help-gsl] GSL_RANGE_CHECK
At Mon, 17 Jul 2006 21:52:05 +0200, Raphael Mack wrote: > I'm writing a wrapper for the Eiffel language for the gsl lib. Since > Eiffel provides contracts, we can be sure that all calls to gsl have > valid indexes and runtime checking for the range may be dropped. I tired > to do this by compiling with -UGSL_RANGE_CHECK, but matrix access are > checked. Looking into the source showed, that in gsl/gsl_check_range.h a > global variable gsl_check_range is defined, which is tested on every > vector and matrix access. This is even initialized to 1 by default. > > Is there a way to get high performance and compile completely without > range checking? Or is the way to go just to set gsl_check_range to 0? Set gsl_check_range to zero to disable range checking in the static functions. Note that there are inline versions of these functions and these are controlled by the preprocessor definitions GSL_RANGE_CHECK and HAVE_INLINE. By default GSL builds using the inline versions internally so calls to the static functions should be rare. -- best regards, Brian Gough Network Theory Ltd, Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/ ___ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
Re: [Help-gsl] Error handling
At Tue, 18 Jul 2006 15:17:40 +0200, Raphael Mack wrote: > The last line will overflow for element (0, 0) so I'd like to see the > value of A = [Inf, 3] and I expected result == GSL_EOVRFLW. > > I wonder how I can compile my app and setup gsl to get this behavior, > because I already played with gsl_ieee_set_mode, but then I get an OS > signal which I don't like. We don't handle IEEE overflow, it's left to the user to detect it. You can use the standard C function fetestexcept() to check whether any IEEE exceptions were raised during a function call and then reset them if necessary. -- Brian Gough Network Theory Ltd, Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/ ___ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
Re: [Help-gsl] Error message during compile - Versions 1.8 & 1.7
At Tue, 18 Jul 2006 09:59:04 +0100, Martin Stennett wrote: > I then tried to compile a C++ program which makes use of the evolving > solver in almost exactly the same way as is done in the example in the > manual. I used the command 'g++ -L/home/P05/stennetm/gsl/lib -lgsl > -lgslcblas -lm -I/home/P05/stennetm/gsl/include three.cc' and got the > following errors: > > /tmp/ccngDDtB.o(.text+0x11e): In function `main': > : undefined reference to `gsl_odeiv_step_rk8pd' A couple of things to try: http://www.network-theory.co.uk/docs/gccintro/gccintro_18.html http://www.network-theory.co.uk/docs/gccintro/gccintro_90.html The header files are wrapped in extern "C" automatically so that's covered. -- Brian Gough Network Theory Ltd, Publishing the GSL Manual - http://www.network-theory.co.uk/gsl/manual/ ___ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
[Help-gsl] fitting example
hi, i have next (hopefully last :-) ) question about non-linear fitting example. function int expb_f (const gsl_vector * x, void *data, gsl_vector * f) "this function should store the vector result f(x,params) in f for argument x and arbitrary parameters params" i understand it that you should compute the value of your function to be fitted with current results (x vector) and store it to vector f. but in this example, you do that + substract "real value" (y_i) from it and divide it by deviation (sigma_i). gsl_vector_set (f, i, (Yi - y[i])/sigma[i]); why do you do that? and what if you dont know deviation of data to be fitted? thanks for answering Petr Ent ___ Help-gsl mailing list Help-gsl@gnu.org http://lists.gnu.org/mailman/listinfo/help-gsl
