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lapack routine dgesdd, error code 1

2 messages · karl cottenie, Brian Ripley

karl cottenie
# 
Hello R-users,

during one of my analyses that involve a SVD, I get the following error
message:

Error in La.svd(x, nu, nv, method) : error code 1 from Lapack routine
dgesdd

With a search on the R web site, I only found references to error codes
17 and 3 for this particular routine. I also found the Lapack web site,
but could not find a list of the possible error messages. If somebody
knows what this error message means, or where I can find more
information, that would be great.

thanks in advance,

Karl
Brian Ripley
# 
You have to read the LAPACK code.  It says

*  INFO    (output) INTEGER
*          = 0:  successful exit.
*          < 0:  if INFO = -i, the i-th argument had an illegal value.
*          > 0:  DBDSDC did not converge, updating process failed.

and 1 > 0 so this was a convergence failure inside the SVD code.

Such things are almost impossible to reproduce elsewhere as they depend on
the BLAS and the optimizations done by the compiler.
On Tue, 24 Feb 2004, karl cottenie wrote: