How can I "connect" the colorbar to my values of a scatter plot?

In your figure, the change of color, from white (corresponding to 0) to black (corresponding to 1), goes from value 0 to value 1000. Instead, what I would need is that the change of color, from white (corresponding to 0) to black (corresponding to 1), goes from value 0 to value 1, since my values in

a = rand(1000,1);

range from 0 to 1, and not from 0 to 1000.

In other words, what I would need is something like this (which I think it is not very correct since I use directly the values of "a" as inputs for the color of the scatter plot! Obviouslly, your opinion and the opinion of other users of this Matlab community is very welcome!):

a = rand(1000,1);
C = 1-[a a a];
scatter(1:length(a),a,60,C,'fill')
l = 1-linspace(0,1,1000)';
colormap([l l l]) 
colorbar

Here, we assign a color of the colorbar - which goes from white, at 0, to black, at 1 -, to each value of

a = rand(1000,1);

which values range from 0 to 1.

For example, if we consider the minimum value of "a":

a(285)
ans =
        0.0013207800733116

the corresponding point of the scatter plot should have, basically, a white color, since white corresponds to the value 0 in the colorbar.

As another example,

a(3)
ans =
          0.88899234515285

and the corresponding point of the scatter plot, should have a very dark grey, almost black, since black corresponds to the value 1 in the colorbar.

Sim 2024-6-24

编辑：Sim 2024-6-24

在 MATLAB Online 中打开

That's great, thanks a lot! Problem solved!

I was not sure about this code:

a = rand(1000,1);
C = 1-[a a a];
scatter(1:length(a),a,60,C,'fill')
l = linspace(1,0,1000)';
colormap([l l l]) 
colorbar

but your further check - with the two red and green points -, confirmed what I was thinking/expecting :-)

Thanks a lot for your great support!

And, I am really sorry for my confusion... My fault :-)

Star Strider 2024-6-24

As always, my pleasure!

No worries! Often, these sorts of mathematical concepts are difficult to describe.

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How can I "connect" the colorbar to my values of a scatter plot?

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How can I "connect" the colorbar to my values of a scatter plot?

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