Howdy, Using gsl_vector_get (), how do I distinguish between an error accessing an out-of-range vector element (returns 0 with error checking off) and an element that is genuinely 0?
I am programming in Gambit-C (Scheme->C compiler) using the GSL for linear algebra. The gsl_vector and gsl_matrix operations have worked really well for me, however I have a unique problem: I need to know when to stop assigning vector elements to a vector in Scheme. If I can determine the length of the vector somehow in C, then I could simply allocate the length in the Scheme code and stop at that index. I thought to do this with error checking: iterate up the vector elements until I reach an out-of-range element, however I have the above problem of distinguishing an element 0 from an error code 0. Is there a way to either (a) determine the length of the vector in C or (b) determine the error condition? Is there some other variable that gets set (errno?) when the error occurs? I'm fairly new to C, and none of the books I have adequately explain how to obtain return status (is it anything other than the return value of the function?). Or should I just use the BLAS functions and abandon gsl_vector and gsl_matrix? Thanks for any help you can offer, Joel -- Joel J. Adamson Biostatistician Pediatric Psychopharmacology Research Unit Massachusetts General Hospital Boston, MA 02114 (617) 643-1432 (303) 880-3109 The information transmitted in this electronic communication is intended only for the person or entity to whom it is addressed and may contain confidential and/or privileged material. Any review, retransmission, dissemination or other use of or taking of any action in reliance upon this information by persons or entities other than the intended recipient is prohibited. If you received this information in error, please contact the Compliance HelpLine at 800-856-1983 and properly dispose of this information. _______________________________________________ Help-gsl mailing list [email protected] http://lists.gnu.org/mailman/listinfo/help-gsl
