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Re: [Bug-gsl] multiwlinear.c:73: ERROR: size of workspace does not match
From: |
Patrick Alken |
Subject: |
Re: [Bug-gsl] multiwlinear.c:73: ERROR: size of workspace does not match size of observation matrix |
Date: |
Sat, 10 Feb 2018 12:19:37 -0700 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0 |
Vlad,
I have uploaded a fix for this issue to the git repository. Now when I
run your original program I get this output:
$ ./test
solution: x=0.5166 y=0.5166 (rank=1, chi2=0.004)
Thanks,
Patrick
On 02/10/2018 10:52 AM, Patrick Alken wrote:
> So as it turns out, the gsl_multifit_wlinear_svd function should be
> deprecated, and I removed it from the documentation, but kept it around
> for legacy reasons - without testing it properly!
>
> The new function is called gsl_multifit_wlinear_tsvd, and you can use
> this call in your code:
>
> gsl_multifit_wlinear_tsvd(A, w, y, tol, x, cov, &chisq, &rank, wsp);
>
> This should make your program run correctly. In the meantime I will
> figure out what to do with gsl_multifit_wlinear_svd - maybe just make it
> a wrapper function for the new tsvd call.
>
> Sorry for the trouble,
> Patrick
>
> On 02/10/2018 10:28 AM, Patrick Alken wrote:
>> Thanks for reporting this, it is indeed a bug. My apologies, I had
>> rewritten the linear least squares routines recently and didn't make
>> proper tests for the wlinear_svd routine. I will work on a fix asap. In
>> the meantime, you can replace the gsl_multifit_wlinear_svd call with:
>>
>> gsl_multifit_wlinear(A, w, y, x, cov, &chisq, wsp);
>>
>> which should work as a temporary fix.
>>
>> On 02/10/2018 12:26 AM, Vlad Koli wrote:
>>> Hi,
>>>
>>> In Debian 9 (gsl 2.3) compilation/execution of the following test-file
>>> causes
>>> error messages. In Debian 7 (gsl ???) it worked fine. The same error
>>> message
>>> also appears in other my programs that worked well in Debian 7 and
>>> were recompiled in Debian 9.
>>>
>>> ** compilation:
>>>
>>> cc -o a -lm -lgsl -lgslcblas linfit-pseudoinv.c
>>>
>>> ** execution:
>>>
>>> ./a
>>>
>>> ** result:
>>>
>>>> gsl: multiwlinear.c:73: ERROR: size of workspace does not match size of
>>>> observation matrix
>>>> Default GSL error handler invoked.
>>>> Aborted
>>> Thank you in advance.
>>>
>>> Vladimir
>>>
>>> ----- begin file: linfit-pseudoinv.c:---------
>>> // compile:
>>> // cc -o a -lm -lgsl -lgslcblas linfit-pseudoinv.c
>>> #include <stdio.h>
>>> #include <gsl/gsl_multifit.h>
>>>
>>>
>>> double tol = 1.e-08; // tolerance
>>>
>>> main()
>>> {
>>>
>>> int n = 3; // observations
>>> int m = 2; // parameters
>>>
>>> size_t rank; // rank
>>> double chisq; // sum of squares of residuals
>>>
>>> // allocate:
>>> gsl_vector *x = gsl_vector_alloc(m); // solution
>>> gsl_vector *y = gsl_vector_alloc(n); // data
>>> gsl_vector *w = gsl_vector_alloc(n); // weights
>>>
>>> gsl_matrix *A = gsl_matrix_alloc(n, m);
>>> gsl_matrix *cov = gsl_matrix_alloc(m, m); // covariances
>>>
>>> gsl_multifit_linear_workspace* wsp = gsl_multifit_linear_alloc (n, m);
>>>
>>>
>>> // set matrix
>>> gsl_matrix_set(A, 0,0, 1.);
>>> gsl_matrix_set(A, 0,1, 1.);
>>> gsl_matrix_set(A, 1,0, 2.);
>>> gsl_matrix_set(A, 1,1, 2.);
>>> gsl_matrix_set(A, 2,0, 3.);
>>> gsl_matrix_set(A, 2,1, 3.);
>>>
>>> // set data
>>> gsl_vector_set(y, 0, 1.);
>>> gsl_vector_set(y, 1, 2.);
>>> gsl_vector_set(y, 2, 3.1);
>>>
>>> // set weights
>>> gsl_vector_set_all(w,1.);
>>> gsl_vector_set(w, 0, 0.);
>>> gsl_vector_set(w, 2, 100.);
>>>
>>>
>>> gsl_multifit_wlinear_svd (A, w, y, tol, &rank, x, cov, &chisq, wsp);
>>>
>>>
>>> printf("solution: x=%.4f y=%.4f (rank=%d, chi2=%.3f)\n",
>>> gsl_vector_get(x,0), gsl_vector_get(x,1), rank, chisq);
>>>
>>>
>>> }
>>> ----- end file: linfit-pseudoinv.c:---------
>>>
>>>
>>>
>