On Tue, Sep 6, 2016 at 2:50 AM, Justin Chang <[email protected]> wrote:
> Thanks all, > > How do you turn off the zero-filling? > -dm_preallocate_only Matt > Justin > > On Monday, September 5, 2016, Matthew Knepley <[email protected]> wrote: > >> On Mon, Sep 5, 2016 at 4:31 AM, Dave May <[email protected]> wrote: >> >>> On 5 September 2016 at 10:43, Justin Chang <[email protected]> wrote: >>> >>>> Hi all, >>>> >>>> So i used the following command-line options to view the non-zero >>>> structure of my assembled matrix: >>>> >>>> -mat_view draw -draw_pause -1 >>>> >>>> And I got an image filled with cyan squares and dots. However, if I >>>> right-click on the image a couple times, I now get cyan, blue, and red >>>> squares. What do the different colors mean? >>>> >>> >>> Red represents positive numbers. >>> Blue represents negative numbers. >>> >>> I believe cyan represents allocated non-zero entries which were never >>> populated with entries (explicit zeroes). Someone will correct me if I am >>> wrong here regarding cyan... >>> >> >> When DMMatrix() is called, it first preallocates a matrix, then fills it >> with zeros and assembles. This is the cyan matrix. Then >> you fillit with nonzeros. This is the second picture with red and blue. >> There is an option for turning off the zero filling. >> >> Matt >> >> >>> Thanks, >>> Dave >>> >>> >>>> Attached are the images of the two cases: >>>> >>>> Thanks, >>>> Justin >>>> >>> >>> >> >> >> -- >> What most experimenters take for granted before they begin their >> experiments is infinitely more interesting than any results to which their >> experiments lead. >> -- Norbert Wiener >> > -- What most experimenters take for granted before they begin their experiments is infinitely more interesting than any results to which their experiments lead. -- Norbert Wiener
