Il giorno gio 10 apr 2025 alle ore 11:25 Peder Jørgensgaard Olesen via petsc-users <petsc-users@mcs.anl.gov> ha scritto:
> I would like to output the contents of a Vec to an ASCII file in which the > entries are all on one line, as "x[0] x[1] x[2] ... x[N-1]". This can > be done in a slightly roundabout way by putting the values in a 1xN dense > Mat, assembling the matrix, and then use MatView with a suitable format, > but one would think that skipping the matrix step and use a VecView > directly would be more efficient (the procedure is to be repeated many > times). > You can use VecGetArrayRead to get the vector data and pass the array to MatCreateDense. Isn't that efficient enough? > However, none of the viewer formats seems to support the desired output > formatting for Vec. > > Is there any way to customize viewer formats for a specific layout - or is > there perhaps a more clever way to do the thing I want? > > Also, somewhat relatedly, is there a more detailed specification of > available viewer formats? The documentation for PetscViewerFormat ( > https://urldefense.us/v3/__https://petsc.org/release/manualpages/Viewer/PetscViewerFormat/*petscviewerformat__;Iw!!G_uCfscf7eWS!Y4XIeKrWEWWPvSSQleoTzKpv3jZILJZ_l47FbAbLvUNnNPA9sunnxxl-LgVNf7U6keAzX4lFkwy9TgeSafvVT5dCJmAUTEU$ > > <https://urldefense.us/v3/__https://petsc.org/release/manualpages/Viewer/PetscViewerFormat/*petscviewerformat__;Iw!!G_uCfscf7eWS!fmgo_gSUThwXeUVpPBhwFVgTXRhk3tS8gDcRbkXu6TQu9lj3Emm5wwGKPUktzKcWMN-isoQKklivtNv-eU4$>) > briefly describes a number of them, and notes that "A variety of > specialized formats also exist", although this isn't elaborated. > > Thanks! > > Best, > Peder > > *Peder Jørgensgaard Olesen* > Postdoc > DTU Construct > Institut for Byggeri og Mekanisk Teknologi > > pj...@dtu.dk > Koppels Allé > Building 403 > 2800 Kgs. Lyngby > https://urldefense.us/v3/__http://www.dtu.dk/english__;!!G_uCfscf7eWS!Y4XIeKrWEWWPvSSQleoTzKpv3jZILJZ_l47FbAbLvUNnNPA9sunnxxl-LgVNf7U6keAzX4lFkwy9TgeSafvVT5dCsW-2QDE$ > > <https://urldefense.us/v3/__https://www.dtu.dk/english__;!!G_uCfscf7eWS!fmgo_gSUThwXeUVpPBhwFVgTXRhk3tS8gDcRbkXu6TQu9lj3Emm5wwGKPUktzKcWMN-isoQKklivEFUBK2I$> > > -- Stefano
