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How to make '.' Markers transparent in a Scatter plot?

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In R2016b, I am able to make Point ('.') Markers transparent in a Scatter plot by setting MarkerEdgeAlpha to a value < 1. For example:
%Generate 'n' random samples.
n = 10000;
x = randn(n,1);
y = randn(n,1);
%Plot.
figure
scatter(x, y, 'Marker', '.', 'MarkerEdgeAlpha', 0.5)
However in R2020b, it seems Point Markers can't be transparent. The same code produces:
Is there any way to make Point Markers transparent in a Scatter plot in R2020b, or was this feature deprecated? I'd rather use Point Markers than filled Circle Markers.

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Zachary
Zachary il 26 Gen 2021
Here's the answer from the Technical Support Case:
The current workaround for this is to use the 'o' marker symbol and divide its size to make it a similar size to the '.' marker symbol. This can be done by adding the following line to the code you sent in:
h = scatter(x, y, 'Marker', 'o', 'MarkerEdgeAlpha', 0.5);
h.SizeData = h.SizeData/9;

Più risposte (1)

Constantino Carlos Reyes-Aldasoro
Hello
Just tested this in R2019a and it works as for you, I have not yet upgraded to 2020.
Just an idea, try to grab the handle of the scatter plot
>> hs=scatter(x, y, 'Marker', '.');
Then you can investigate the properties of the handles directly, type hs. and then tab and a window with all the properties will appear, scroll down, in my case I found MarkerEdgeAlpha:
>> hs.MarkerEdgeAlpha
ans =
1
Which I could modify like this
>> hs.MarkerEdgeAlpha=0.5
hs =
Scatter with properties:
Marker: '.'
MarkerEdgeColor: 'flat'
MarkerFaceColor: 'none'
SizeData: 36
LineWidth: 0.5000
XData: [1×10000 double]
YData: [1×10000 double]
ZData: [1×0 double]
CData: [0 0.4470 0.7410]
Show all properties
>>
Perhaps you have to modify hs.MarkerFaceAlpha as well?
Hope that helps.
  2 Commenti
Zachary
Zachary il 22 Gen 2021
Unfortunately, that doesn't seem to work. When I try...
%Generate 'n' random samples.
n = 10000;
x = randn(n,1);
y = randn(n,1);
%Plot.
figure
h = scatter(x, y, 'Marker', '.', 'MarkerEdgeAlpha', 0.5, 'MarkerFaceAlpha', 0.5);
get(h, {'MarkerEdgeAlpha' 'MarkerFaceAlpha'})
... I get...
ans =
1×2 cell array
{[0.5000]} {[0.5000]}
It looks like the object properties MarkerEdgeAlpha and MarkerFaceAlpha are correctly set, but when the Marker is '.' (Point), they don't apply.
Constantino Carlos Reyes-Aldasoro
Well, then it may be that this has been disabled, try changing to a circle marker of small size. Not the same as a point, but may be the second best.

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