[petsc-dev] how to print with PescPrintf a PetscScalar value?

[Luigia Ambrosio]

sorry... previously I had tried with a cast ... something like (PetscInt)sum... I knew PetscGetReal is a function... but I just replaced PetscInt with PetscGetReal... without moving parenthesis
thanks again
Luigia Ambrosio

Se la gente ferisce è perchè tu sei migliore e lo capisce bene! - Tiziano Ferro




Il giorno 04/lug/2012, alle ore 10:20, Jed Brown ha scritto:

> On Wed, Jul 4, 2012 at 12:15 AM, Luigia Ambrosio <ambrosio.luigia at gmail.com> wrote:
> this is the source code (very simple)
>   Vec            x;
>   PetscInt       n = 10;
>   PetscErrorCode ierr;
>   PetscScalar one = 1.0;
> 
>   ierr = VecCreateMPI(PETSC_COMM_WORLD, PETSC_DECIDE, n, &x);CHKERRQ(ierr);
>   ierr = VecSet(x,one);CHKERRQ(ierr);
>   PetscScalar sum=0.0;
>   ierr = VecSum(x,&sum);CHKERRQ(ierr);
>   ierr = PetscPrintf(PETSC_COMM_WORLD,"sum %f\n",(PetscRealPart)sum);
> 
> Use PetscRealPart(sum), it is a function, not a type.
> 
>  
> CHKERRQ(ierr); puts("");
> 
> This puts will be issued by every process, leading to messy output, especially for larger runs. Just add a second \n to the string passed to PetscPrintf() if you want another newline.
>  
> ...
> 
> and this is the error message I get trying make myex
>   error: 'PetscRealPart' was not declared in this scope
> 
> this is how I compile myex
> myex: myex.o  chkopts
>         -${CLINKER} -o myex myex.o ${PETSC_VEC_LIB}
>         ${RM} -f myex.o
> 
> I have petsc 3.3 developer version
> 
> Luigia Ambrosio
> 
> Se la gente ferisce è perchè tu sei migliore e lo capisce bene! - Tiziano Ferro
> 
> 
> 
> 
> Il giorno 04/lug/2012, alle ore 09:58, Jed Brown ha scritto:
> 
>> On Tue, Jul 3, 2012 at 11:53 PM, Luigia Ambrosio <ambrosio.luigia at gmail.com> wrote:
>> It seems I don't have this function. I checked my configuring options, in particular
>> --with-scalar-type=complex 
>> 
>> Which version of PETSc? Can you send the full error message?
>>  
>> 
>> so I'm sure that a PetscScalar variable is handled as a complex number. I tried to use the PetscRealPart but it says:
>> error: 'PetscRealPart' was not declared in this scope
>> 
>> I included also the header "petscmat.h" but there isn't defined this function. 
>> It seems that I don't include the right header, I googled it but I didn't find it. Which header shiuld I include?
>> 
>> That header includes petscmath.h (which you should not include directly).
>>  
>> thanks
>> 
>> Luigia Ambrosio
>> 
>> Se la gente ferisce è perchè tu sei migliore e lo capisce bene! - Tiziano Ferro
>> 
>> 
>> 
>> 
>> Il giorno 04/lug/2012, alle ore 09:28, Jed Brown ha scritto:
>> 
>>> On Tue, Jul 3, 2012 at 11:26 PM, Luigia Ambrosio <ambrosio.luigia at gmail.com> wrote:
>>> Is there a function already avilable to get the real part of a petscscalar value?
>>> 
>>> 
>>> PetscRealPart() and PetscImaginaryPart() 
>> 
>> 
> 
> 

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