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When you want to plot scatter points with fixed alpha value in Matlab, you may the patch function, like advised in this SO question. But when you want to plot a high number of individual points, you should use the plot function, as advised in this SO question.

Is it still possible to plot a high number of scatter points with fixed alpha value in Matlab ?

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M1L0U
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    If you have a sufficiently high number of points so that you're covering the region you're interested in, is a better approach perhaps to bin the points (with a 2D histogram) and then use `images`, so that this becomes more like a simple density map? – GJStein Feb 13 '15 at 18:35
  • Unfortunately I do not have matlab in front of me right now, but what I can contribute with is that, the properties of an object in matlab can be listed using `get(objectHandle)`. If there is an alpha value here it is possible to set it. Each handle also contains references to parent handles and child handles. – patrik Feb 14 '15 at 12:13
  • @GJStein: A density map would be fine if the scatter points have all the same color value. But when you want to deal with a vector of color values, it requires more effort to compute "at hand" the mixture of corresponding colors... – M1L0U Feb 16 '15 at 14:38

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