Associate colormap to temperature of plot x,y data

Hello,

I'm trying to find a way to map temperature (degC) to a color map, such as 'jet', so that when I plot a x,y graph, I can plot the color of that line to represent the temperature of the data

for example, my temperature range would be -50degC to +150degC.

on one figure plot, I could plot three lines of measurement data, one taken at cold (-30degC), another at room temperature (+23degC), and the last at hot (+75degC). The colors of the plot lines would be blue, green, and red.

I would use some kind of lookup to the color map, based on the known temperature of the data (data file includes temperature in the header).

this would be a 2D plot, so instead of e.g. figure;plot(x,y,'k-');hold on;plot(a,b,'r-') it would be

% lookup temperature of dataset x,y and dataset a,b tempxy = -15; tempab = +45; % find this temperature and associated a color to them colorxy = [0 0 0.789]; colorab = [0 0.456 1]; figure;plot(x,y,'color',colorxy) %etc

Can anyone please advise on the best way to do this?

Thank you.

Answer 1

[Phil Newman]

HI,

this was my final solution.

colormap = jet; % or type out values of jet into colormap
x = 1:0.1:20; % dummy dataset
y = sin(x);

newrange = [1:64/100:64]'; % temperature range of -25degC to +75degC = 100 points
oldrange = [1:1:64]';
colormapinterp = interp1(oldrange,colormap,newrange); %Vq = interp1(X,V,Xq);
temprange = [-25:1:75];

temp1 = -15;
temp2 = 25;
temp3 = 65;

k1 = find(temprange==temp1); % find index of each temperature
k2 = find(temprange==temp2);
k3 = find(temprange==temp3);

color1 = colormapinterp(k1,:,:); % find color based on index value
color2 = colormapinterp(k2,:,:);
color3= colormapinterp(k3,:,:);

figure
plot(x,y,'Color',color1)
hold on
plot(x,10*y,'Color',color2)
hold on
plot(x,5*y,'Color',color3)

Answer 2

[Image Analyst]

Use caxis().

[Phil Newman]

Hi,

thanks for your response.

I'm not sure that caxis() will help me here, as this seems to be for mesh type plots?

I am only using line data in a x,y format. each line is plotted individually on the same graph, and the color of the line would correspond to the temperature associated with the data.

Thanks, Phil

Answer 3

[Phil Newman]

Hi,

thanks for your response.

I'm not sure that caxis() will help me here, as this seems to be for mesh type plots?

I am only using line data in a x,y format. each line is plotted individually on the same graph, and the color of the line would correspond to the temperature associated with the data.

Thanks, Phil