scatter with custom color of point

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?

Answer 1

[Star Strider]

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:

[Gaetano Pavone]

I want a picture like this:

[Star Strider]

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.