Scatter plot does not display point 0,0 when double precision

I have the following code which works as intended, plotting 3 points.

x = [0 0; 12 0; 6 6];
scatter(x(:,1), x(:,2), 100, 'fill');

However, when I interject the following line

x = 1.01 * x;

which effectively turns everything into double precision, then the point 0,0 does not display

why is that, and how can I make it so that it also displays?

Thanks in advance!

Answer 1

[José-Luis]

Trying to understand the mess that is Matlab's graphics engine is a real pain. I can only recommend a workaround:

x = [0 0; 12 0; 6 6];
figure(1)
scatter(x(:,1), x(:,2), 100, 'fill');
x = 1.01 * x;
figure(2)
scatter(x(:,1), x(:,2), 100, 'fill'); %Now readjust the axes so you can see what you actually plotted:
set(gca,'XLim',x([1 2],1)); %you can use min() max() in order to avoid hard coding the indices.
set(gca,'YLim',x([1 3],2));

Answer 2

[AJ von Alt]

This looks like an issue with the Painters renderer. Switching to OpenGL resolves the issue on my end.

x = [0 0; 12 0; 6 6];
figure('renderer','OpenGL')
scatter(x(:,1), x(:,2), 100, 'fill');
y = 1.01 * x;
figure('renderer','OpenGL')
scatter(y(:,1), y(:,2), 100, 'fill');

[chris]

This also works! Although it goes beyond my ability to understand this, it is a cleaner solution. Thanks!

P.S. I think you need the

figure('renderer','OpenGL')

line only once, otherwise it creates an additional empty plot...

[AJ von Alt]

The renderer is used to draw the plot in the figure. It is defined independently for each figure so you will need to specify it every time you create one.

You can change the renderer of the current figure to "OpenGL" using the command:

    set( gcf , 'renderer' , 'OpenGL' )

To read more about renderers see: http://www.mathworks.com/help/releases/R2013b/matlab/ref/figure_props.html#Renderer

Answer 3

[chris]

Thanks for your answer. Attached image is how my system behaves.

Answer 4

[chris]

This works! It is weird though why the original version doesn't behave seamlessly.

Anyways, thanks everybody for the help.