How to make data points on graph transparent or less visible?

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Marin
Marin 2012-7-10
I need to plot an contourf plot which represents the density of some data points and over that I need to put those data points. The problem is when I plot them ordinarily, I can barely see anything, so I started experimneting with transparency, but while it's easy to make the contourf plot transparent with alpha command, how can I make the data points transparent? alpha doesn't seem to work for them.
I would like for the data points just to be a slight haze in the background and for the contours too be visible over them.
And one more thing. Where in the plot tools can I find the option to adjust alpha for contourf graph? It's for another figure, but the problem is similar to this one I think. I plot the contourf graph with alpha 0.5. Then I open the plot tools and adjust the x axis to log scale. As I do that Matlab automaticaly sets alpha back to 1 and I cannot find anywhere in the plot tools and docking figure an option to adjust it back
Any help with tese two problems?
Thank you in advance!

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回答（1 个）

Walter Roberson
Walter Roberson 2012-7-11
The only renderer that supports transparency is OpenGL, but OpenGL does not support log scale axes.
What are you using to plot your data points at present?
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Marin
Marin 2012-7-12
编辑：Marin 2012-7-14
I don't think I'll need to set it at different values for different locations. So do I just write something like:
scatter(krateri_br(:,3),krateri_br(:,4))
alpha 0.5
Or is it more complex than that? How do I control these patches and set their alpha?
And can I set one axis in log scale for scatter plot?
Marin
Marin 2012-7-14
I've been reading on scattergroup objects in this link that you sent, but I cannot make anything useful out of it. :( Im' still new at Matlab...

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