Apply colormap to plot(x,y)

Hi. I am plotting optical bandpass filters from measurments and want to colour each point depending on where it is on the spectrum. My x values are wavelength (488 = blue, 532 = green and 670 = red). For each point i plot, I want to be able to plot it in a colour that represents its true colour.

Im not sure how to firstly create the colormap, and secondly apply this to the plot(x,y function).

Answer 1

[Andrew Newell]

To create the colormap, you could use spectrumRGB in Spectral and XYZ Color Functions.

EDIT: Here is a little demo.

n = 20; 
x = rand(n,1); y = rand(n,1); spect = linspace(300,830,n);
sRGB = spectrumRGB(spect);
sRGB = squeeze(sRGB); % For some reason spectrumRGB returns a 3D array
figure; hold on
for i = 1:n
  line(x(i),y(i),'Marker','*','Linestyle','none','Color',sRGB(i,:))
end
spectrumlabel(gca)