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Scatter plot density

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RDT2006

USA
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Posted - 10/20/2006 : 4:10:38 PM

Hi,

I have a dense plot of over 20,000 data points with x and y values in a narrow range of both x and y. A simple XY plot of this data shows the very dense nature of the data. I wondered whether there is a way to select a certain bin size and then colour by frequency that the values were in the bins, hence find clusters within the data.

I hope you can help.

RDT

Mike Buess

USA
3037 Posts

Posted - 10/21/2006 : 12:58:28 PM

Hi RDT,

I suggest you try Origin's built-in 2D Binning command. Select the Y column, run Edit > Convert to Matrix > 2D Binning and enter the bin dimensions in the resulting dialog. That will create a matrix for which the X and Y dimensions are those of the starting worksheet and the Z dimension (cell values) are the frequencies for the corresponding bins. You can try various plot types to display the matrix but I'd start out with a contour plot.

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 10/21/2006 1:13:39 PM

RDT2006

USA
Posts

Posted - 10/22/2006 : 9:56:11 PM

Thanks, thats exactly what I wanted.

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