scatter plot with color gradient on y-values

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Alejandro Fernández
评论： Alejandro Fernández 2020-6-8
Hello, I have a question: when making a scatterplot with a color gradient, what I want is that this gradient is applied to the values on the Y axis, not to those on the X axis (which is what I manage to do with the code at the bottom)
close all; clear all; clc
load data.mat
data = flipud(data.').';
% Create colormap
len = 50;
c1 = [5, 25, 150]/255;
c2 = [245, 225, 235]/255;
c = [linspace(c1(1),c2(1),len)', linspace(c1(2),c2(2),len)', linspace(c1(3),c2(3),len)'];
% Scatter data
scatter(data(1, :), data(2, :), 10, 1:size(data,2), 'filled');
colormap(c);
colorbar
What I mean is that, being the data of the Y axis number that goes from 0 to 1, and I take into account that the color scale goes from dark blue for low values to pink for high values, if you have the points (x,y) (5,0.75), (6,0.80) and (7,0.40) what I want to achieve is that the point (7,0.40) is the most blue, the (6,0.80) the most pink and therefore the point (5,0.75) has an intermediate color.

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采纳的回答

Bjorn Gustavsson
Bjorn Gustavsson 2020-6-8
That should be as easy as:
scatter(data(1, :), data(2, :), 10, data(2,:), 'filled');
You can modify the scaling of the colour-argument of you want a different look, sqrt, log or whatever, and then make the corresponding change to colorbar etc.
HTH

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