scatter with custom color of point

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Gaetano Pavone
Gaetano Pavone 2019-12-8
评论： Star Strider 2019-12-8
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?
Cattura.JPG

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回答（1 个）

Star Strider
Star Strider 2019-12-8
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
Experiment to get different results.
This example produced this plot:
scatter with custom color of point - 2019 12 08.png
  2 个评论
Star Strider
Star Strider 2019-12-8
I cannot guess what your data are, or how you want to categorise them. My code does what you initially requested.
To get a diagonal dashed line:
plot(xlim, ylim, '--k')
Without more details, I can go no further.

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