how to plot a scattered heat map

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sani 2020-1-29

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评论： Image Analyst 2021-1-30

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

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sani 2020-1-29

I don't want the hexagonal plotting, just the heatmap coloring on a regular scattered plot (I will replace the image to something more similar to what I need)

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.

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回答（1 个）

Image Analyst 2020-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/502563-how-to-plot-a-scattered-heat-map#answer_412659

在 MATLAB Online 中打开

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;