Your image contains the "density" field with a width of 10 in code units along each axis. So each row corresponds to the density value sampled over a 1x1 (in code units) region of your simulation, since you specified that you wanted a 10x10 image.

You might find the OffAxisProjectionPlot object to be a bit nicer to work with to make plots:

http://yt-project.org/doc/visualizing/plots.html#off-axis-projection-plots
http://yt-project.org/doc/reference/api/yt.visualization.plot_window.html#yt.visualization.plot_window.OffAxisProjectionPlot

OffAxisProjectionPlot presents the same interface as ProjectionPlot and will make a plot with axes and labels that should hopefully be easier to understand than the raw image you are dealing with now.


On Sun, Jan 21, 2018 at 10:42 AM, Julia Rakas <jrakas@umich.edu> wrote:
Thank you! And I was wondering how exactly the output array corresponds to the image? 



For example, in the above ImageArray, what do the rows/colums mean?

Thanks again,
Julie

On Jan 21, 2018, at 8:45 AM, Nathan Goldbaum <nathan12343@gmail.com> wrote:

Hi Julia,

If I create a ProjectionPlot like so:

    p = ProjectionPlot(ds, 'z', ('gas', 'density'))

Then I can access the image array you are looking for like this:

    image = p.frb['gas', 'density']

This is using the FixedResolutionBuffer object that is associated with the ProjectionPlot. You also don't need to create a ProjectionPlot to do this, you can instead manually create a FixedResolutionBuffer object. See the following doc pages:


Hope that helps,

Nathan

On Sun, Jan 21, 2018 at 12:47 AM Julia Rakas <jrakas@umich.edu> wrote:
Hello,

When I do yt.off_axis_projection(…) I get an array as an output. My question is how I can get an output array for regular projection plots? And does the output array correspond to the actual image that it otherwise would have plotted?

Thanks,
Julie
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