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asanture
Joined: 04 Jan 2007
Posts: 1
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 Posted: Thu Jan 04, 2007 10:56 am Post subject: Plots with very small y values |
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Hi there,
I've been using DPlotJr to plot likelihoods for different configurations across iterations (ie using _AddData each iteration). When I have "reasonable" likelihoods of the order 1xe^-40 DPlot plots beautifully, but with very small likelihoods of the order 1xE^-80 DPlot seems to read every y value as zero and plots accordingly. Can you please tell me the minimum y value that DPlot will accept?
Thanks for your help!
Anna |
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DPlotAdmin
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Joined: 24 Jun 2003
Posts: 2310
Location: Vicksburg, Mississippi
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| Posted: Thu Jan 04, 2007 2:33 pm Post subject: |
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You should use DPlot_AddData8 rather than DPlot_AddData, and use Double for your data rather than Single. It is actually your program that is truncating the data, not DPlot Jr or DPLOTLIB.DLL. The range in magnitudes for 4-byte floating point numbers (VB's Single) is ~1.175E-38 to ~3.402E+38. For 8-byte floats (Double) the range is ~2.225E-308 to ~1.798E+308.
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