[Help-gsl] What means the vector v in description of gsl_linalg_QR_Qvec in Manual, page 130, chapter 13

[Jo_Jo]

What is that vector v in description of

gsl_linalg_QR_QTvec()  and   gsl_linalg_QR_Qvec() ?



In description of gsl_linalg_QR_Rsolve() function:

" ... It may be useful if the
product b prim = QT* b has already been computed using gsl_linalg_QR_QTvec."

That means, that
b prim = QT*b and commes from gsl_linalg_QR_QTvec() function.


About gsl_linalg_QR_QTvec() one reads function:
 
 " ... vector v, storing the result QT v in v. ..."
 
 That means, that these vector v = QT * b  ?
 

About function int gsl_linalg_QR_Qvec() function one read :
 
" .... vector v, storing the result Qv in v. ..."
 
 That means that these vector v = Q * b ?
 


These two descriptions of both functions should be :
 
 1.)  in the first  description:
 
 "Function int gsl_linalg_QR_QTvec  ...
      
  ...   vector b, storing the result QT* b in b. ..."
 
 2.) in the  second description:
 
 " Function  int gsl_linalg_QR_Qvec  ...
   ...   vector b, storing the result Q*b in b. ....

 
Best regards

Andrzej Buczynski