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2D histogram color plot [message #41398]

Mon, 25 October 2004 09:31

cwodell
Messages: 2
Registered: October 2004

Junior Member

Hi everyone,

I need to make a scatter plot between 2 variables, x and y. Problem
is that the number of (x,y) pairs is VERY large, so you can't really
see what's going on in the scatter plot. I therefore would like to
make color scatter plot, where the color in a certain x,y bin is
related to the density of points in that bin. I see that hist_2d can
create the physical array that I need, but then you need tv or tvscl
or something to plot it. Does anyone have a program that will do all
of this in one go? Ie, call hist_2d, and then make a nice plot?

Thanks,
Chris

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Re: 2D histogram color plot [message #94537 is a reply to message #41398]

Wed, 28 June 2017 18:08

laura.hike
Messages: 87
Registered: September 2013

Member

Hi,

I basically have the same problem, but since this question was first asked/answered in 2004, I was wondering whether there is a native IDL function available now to make this kind of plot. I also ran hist_2d, but have been trying use IMAGE to make the plot, but it's not working. (The array is 20x20, so the plot comes out tiny no matter what I do.)

Thanks,

Laura

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Re: 2D histogram color plot [message #94538 is a reply to message #94537]

Wed, 28 June 2017 18:11

laura.hike
Messages: 87
Registered: September 2013

Member

Of course I would also like to have labeled axes, etc., on the plot.

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