[petsc-users] Coloring of -mat_view draw

[Justin Chang]

Thanks all,

How do you turn off the zero-filling?

Justin

On Monday, September 5, 2016, Matthew Knepley <knepley at gmail.com> wrote:

> On Mon, Sep 5, 2016 at 4:31 AM, Dave May <dave.mayhem23 at gmail.com
> <javascript:_e(%7B%7D,'cvml','dave.mayhem23 at gmail.com');>> wrote:
>
>> On 5 September 2016 at 10:43, Justin Chang <jychang48 at gmail.com
>> <javascript:_e(%7B%7D,'cvml','jychang48 at gmail.com');>> 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
>
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