dgel | - A WebGPU engine | Graphics library
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kandi X-RAY | dgel Summary
A WebGPU engine.
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QUESTION
I am learning Cython lapack interface. I tried to convert a small example using lapack in C to one in Cython with the cython_lapack package.
Here is the C code:
...ANSWER
Answered 2018-Mar-10 at 14:00If LWORK = -1, then a workspace query is assumed; the routine only calculates the optimal size of the WORK array, returns this value as the first entry of the WORK array, and no error message related to LWORK is issued by XERBLA.
You haven't asked for a calculation - you've just asked how big you should make the workspace array. You can either
- follow this up with a second call with an appropriately sized workspace array, or
- just allocate a workspace array according to the documentation (optimally
max( 1, MN + max( MN, NRHS )*NB )
) and pass the size of that asLWORK
.
QUESTION
I'm spending some time in learning how to use templates in C++. I never used them before and I'm not always sure what can be or what cannot be achieved in different situation.
As an exercise I'm wrapping some of the Blas and Lapack functions that I use for my activities,
and I'm currently working on the wrapping of ?GELS
(that evaluates the solution of a linear set of equations).
ANSWER
Answered 2018-Mar-08 at 13:57Why don't you try to combine tag dispatch together with some static_assert
s? Below is one way of achieving what you want to solve, I hope. I mean, all the three correct cases are properly piped to the correct blas
calls, different types and dimension mismatches are handled, and the violation about float
and double
s is also handled, all in a user-friendly way, thanks to static_assert
.
EDIT. I am not sure about your C++
version requirement, but below is C++11
friendly.
QUESTION
I want to solve the least square problem |Ax-b|->min with LAPACK's dgels_ in C, but I'm getting a segmentation fault error (I am aware that there was a similar problem, but the code is quite different and the answers do not apply to my problem). I already located the problem, it is right when dgels_ is executed.
Code:
...ANSWER
Answered 2017-Oct-19 at 19:590
is not a legal value for the argument lwork
of dgels. Indeed, it must be a pointer to an integer in c, since all arguments are called by reference in fortran, while all arguments are called by value in c. Moreover, the value of lwork
specifies the length of the array work
, which must be larger than 1: LWORK >= max( 1, MN + max( MN, NRHS ) )
. The only exception is lwork=-1
: in this particular case, the function returns to optimal size for the array work
in work[0]
.
For instance, the following lines can be tried:
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