Scatter plot with variable symbol size - it's not linear

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dormant 2023-8-4

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评论： Jon 2023-8-4

I'm trying to use the feature in the scatter plot where the symbol size is proportional to a variable and it seems that the scaling of the symbol size is not linear.

Here is some test code and the resulting plot:

x = 1:100;
y = ones( size(x) );
scatter( x, y, 100*x, '|' );
xlim( [0 101] );
ylim( [0 2] );

Is this the expected behaviour? I need the symbol size to vary linearly with the variable.

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Answer 1

Jon 2023-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/2004757-scatter-plot-with-variable-symbol-size-it-s-not-linear#answer_1283442

编辑：Jon 2023-8-4

在 MATLAB Online 中打开

According to the documentation for scatter, the size in "points squared" units, try this

x = 1:100;

y = ones( size(x) );

scatter( x, y, x.^2,'|' );

xlim( [0 101] );

ylim( [0 2] );

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dormant 2023-8-4

That's brilliant, many thanks!

Now I see it in the documentation.

Jon 2023-8-4

Your welcome. When first I read the documentation it wasn't really clear to me whether that meant I should take the square root of x, or square it. A little trial and error quickly showed squaring it was the right way to go.

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