Create a heatmap from x and y values

Good morning,

I was hoping that someone could help me with this, I want to turn x and y coordinates into a heatmap:

I have a matrix edf_n, with edf_n.x and edf_n.y where these both have 530934 values that correspont to eye tracking data and where a participant was looking on the screen. I can plot this using a scatterplot: scatter(edf_n.x, edf_n.y) which looks like this:

However, what I want is to instead have a heatmap, instead.

Thank you very much!

Douwe

Answer 1

[David Hill]

t=table(edf_n.x,edf_n.y);
heatmap(t,'Var1','Var2');

[Douwe Horsthuis]

Thank you, but when trying this one of 2 things happen

1) matlab crashes, due to a low-level graphics error

2) if instead I plot 90805 elements instead of 530934 (in my case 2 blocks instead of all 12 blocks of data) I get this:

I believe that this is due to the way it is plotting it. My goal was to get a plot like this (this is using one dataset):

[Image Analyst]

You keep foregetting to attach your data, leading me to think you've never read the posting guidelines.

If you have any more questions, then attach your data and code to read it in with the paperclip icon after you read this:

TUTORIAL: How to ask a question (on Answers) and get a fast answer

[Douwe Horsthuis]

sorry about that, I had hopes that it would have worked without attaching the data. But I've attached it here. It my first time posting here, but for the rest I don't think I am missing/abusing any of the guidlines, or am I?