scatter with custom color of point

Question

Gaetano Pavone 2019-12-8

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https://ww2.mathworks.cn/matlabcentral/answers/495529-scatter-with-custom-color-of-point

评论： Star Strider 2019-12-8

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I have a timetabel TT with 3 columns and 153424 rows:

column 1 named Timewh1

column 2 named Var1_TTwh1hourclean

column 3 named Var1_TTERA5swh;

I would like to scatter plot 2nd and 3rd columns with a custom color of points. In particular, since such points are related to the comparison between observed and modelled data, I want that the color of point, in a colorbar from 0 to 1, is equal to 1 if observed data is equal to modelled data.

I try to build the vector of the ratios:

color=TT.Var1_TTERA5swh./TT.Var1_TTwh1hourclean;

and plot this scatter:

scatter(TT.Var1_TTwh1hourclean,TT.Var1_TTERA5swh,[],color);

but the result is not equal to the desired one:

Moreover, I would like to add a dashed line as a bisector of the plot. How can I do this?

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Answer 1

Star Strider 2019-12-8

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495529-scatter-with-custom-color-of-point#answer_405398

在 MATLAB Online 中打开

I am not certain what you want.

Try this:

x = rand(1, 20);
y = rand(1, 20);
c = y >= 0.5;                                   % Determines Colour
figure
scatter(x, y, [], c, 'o')
hold on
plot(xlim, [1 1]/2, '--k')
hold off
xlabel('x')
ylabel('y')
colormap([1 0 0; 0 1 0])
colorbar