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

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.

Answer 1

[Jon]

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] );

[dormant]

That's brilliant, many thanks!

Now I see it in the documentation.

[Jon]

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.