how to plot a scattered heat map
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Hi,
I have 2 vectors from a table, and I'd like to create chart similar to the one in the picture. I didn't found any matlab of the shelf command for it, is there is a way that I can
3 Comments
Mohammad Sami
on 29 Jan 2020
Edited: Mohammad Sami
on 29 Jan 2020
Yes the scatter function will work for that.
scatter(x,y,size,color).
If you don't have size you can leave it empty.
scatter(x,y,[],color).
Use colormap to change the coloring scheme if you need to.
Answers (1)
Image Analyst
on 29 Jan 2020
Mohammad is right. Make a colormap, such as jet or hsv, and build a color table where for each value of your data, you assign the corresponding color from the colormap. Easy. Attach your data if you can't do it and someone will for you. Something like this untested code:
cmap = jet(256);
v = rescale(yourValues, 1, 256); % Nifty trick!
numValues = length(yourValues)
markerColors = zeros(numValues, 3)
% Now assign marker colors according to the value of the data.
for k = 1 : numValues
row = round(v(k));
markerColors(k, :) = cmap(row, :);
end
% Create the scatter plot.
scatter(x, y, [], markerColors);
grid on;
4 Comments
Wen Chuan Chong
on 30 Jan 2021
Hi!
I have 4 variables (x,y,z,energy) and I would like the colour to be on the energy variable. Can you advise on how I would achieve this?
Best regards,
Jacob
Image Analyst
on 30 Jan 2021
@Wen Chuan Chong, can you attach your 4 variables in a .mat file in a new question?
save('answers.mat', 'x', 'y', 'z', 'energy');
That way we'll have something to work with. In the meantime, see my attached example.
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