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

Question

chris 2014-4-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126872-scatter-plot-does-not-display-point-0-0-when-double-precision

评论： AJ von Alt 2014-4-23

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!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

José-Luis 2014-4-23

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126872-scatter-plot-does-not-display-point-0-0-when-double-precision#answer_134316

在 MATLAB Online 中打开

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));

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 2

AJ von Alt 2014-4-23

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/126872-scatter-plot-does-not-display-point-0-0-when-double-precision#answer_134318

在 MATLAB Online 中打开

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');

2 个评论
显示无隐藏无

chris 2014-4-23

在 MATLAB Online 中打开

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 2014-4-23

在 MATLAB Online 中打开

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

请先登录，再进行评论。