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 个评论
Mohammad Sami
2020-1-29
编辑:Mohammad Sami
2020-1-29
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.
回答(1 个)
Image Analyst
2020-1-29
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 个评论
Wen Chuan Chong
2021-1-30
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
2021-1-30
@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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