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...-L/usr/lib64/R/lib -lR Next, I try to load the shared object into R using dyn.load("RgslTest.so") and get the following error in R: > dyn.load("RgslTest.so") Error in dyn.load(x, as.logical(local), as.logical(now)) : unable to load shared library '/mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so': /mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so: undefined symbol: gsl_sf_hyperg_2F1 I am certain that the file path in the #include statement is correct. It looks like R can't find the gsl function in the C program, even though the compil...

...RgslTest.o gcc -shared -L/usr/local/lib64 -o RgslTest.so RgslTest.o -L/usr/lib64/R/lib -lR When I go into R and enter the command dyn.load("gslTestHG.so"), I get the following error: Error in dyn.load(x, as.logical(local), as.logical(now)) : unable to load shared library '/mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so': /mnt/san2/braunm/winshare/braunm/Cpractice/RgslTest.so: undefined symbol: gsl_sf_hyperg_2F1 So, it looks like R is not recognizing the function call within my own C function, even though the library was included. Note that this is a simpler example of...

...in a particular panel. Thanks in advance for any help you can provide, Michael Michael Braun Homer A. Burnell Career Development Professor and Assistant Professor of Management Science (Marketing Group) MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02139 (617) 253-3436 braunm at mit.edu

...n someone offer some assistance? Thanks, Michael ------------------------------------------- Michael Braun Homer A. Burnell Career Development Professor, and Assistant Professor of Management Science (Marketing Group) MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02142 braunm at mit.edu 617-253-3436

...but I cannot find a description of what they do, what the arguments are, and so forth. Is examining the source code directly the only way? Thanks, Michael Michael Braun Assistant Professor of Marketing MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02142 (617) 253-3436 braunm@mit.edu [[alternative HTML version deleted]]

...9; errors in totally different scenarios. So I am flummoxed, and don't really know where to go from here. Best wishes, MB ------------------------------------------ Michael Braun Assistant Professor of Marketing MIT Sloan School of Management 38 Memorial Drive, E56-329 Cambridge, MA 02139 braunm at mit.edu (617) 253-3436

...rom the Intel MKL for Linux User's Guide, chapter 5. So, still no luck linking to the optimized BLAS. I'd appreciate any suggestions. Thanks, Michael -- Michael Braun Assistant Professor of Marketing MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02142 USA braunm at mit.edu +1 (617) 253-3436

...ld compute a sparse LDL' decomposition from an existing R function, and quickly modify the output? Thanks, Michael ------------------------------------------- Michael Braun Associate Professor of Management Science MIT Sloan School of Management 100 Main St.., E62-535 Cambridge, MA 02139 braunm at mit.edu 617-253-3436

...create a duplicate, is there a way to destroy it manually before the end of the function, rather than rely on on the R garbage collector? Thanks, Michael Michael Braun Assistant Professor of Marketing MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02142 (617) 253-3436 braunm@mit.edu [[alternative HTML version deleted]]

...gregated relative time spent in each function (more than 80% of the time, it's in the .Call). So I'm stuck. Can anyone help? Thanks, Michael -- Michael Braun Assistant Professor of Marketing MIT Sloan School of Management One Amherst St., E40-169 Cambridge, MA 02142 (617) 253-3436 braunm at mit.edu

...rays). Also, are the functions and macros described in the Rinternals header documented anywhere? I can't seem to find the source code, or a description of what these functions actually do. Thanks again for any help you can provide. Best wishes, Michael Braun MIT Sloan School of Management braunm at mit.edu SEXP r = PROTECT(allocVector(VECSXP,n)); double rm[k][k]; for (i=0; i<n; i=i+1) { for (a=0; a<k; ++a){ // convert to gsl matrix for (b=0; b<k; ++b){ ind = b*k + a; m = REAL(VECTOR_ELT(list,i))[ind]; gsl_matrix_set(mat, b, a, m); } } // end conversion...