Plotting Data as Heatmap/Bar Graph Hybrid?

Hey so I'm plotting some temperature data from thermistors along a body to present at a research symposium, and I want to try and represent it in a way that represents what the temperature was at the specified point along the body. Using just normal pot(), the data looks like this:

what I want to do is make essentially a horizontal bar graph, where the y-axis is each of the lines in the plot above, the x-axis is time, and the color of the bar at that point in time is heatmapped to the value of that line at that time. I had tried just using heatmap() with the input data but it spit out a chart that was taken up by the division lines (there's ~22k samples for each sensor) so you couldn't actually see any of the colors.

in short, transforming the plot above > desired:

x-axis > x-axis

legend > y-axis

y-axis > bar color at x

thanks!

Answer 1

[Voss]

Something like this?

% generate t and data
Nt = 22e3;
Nc = 8;
t = linspace(0,1,Nt).';
data = zeros(Nt,Nc);
t0 = 0.15;
idx = t > t0;
data(idx,:) = (t(idx)-t0).^0.25.*exp(1.5*(t0-t(idx)))*2.*(Nc:-1:1)/Nc;
whos t data

  Name          Size              Bytes  Class     Attributes

  data      22000x8             1408000  double              
  t         22000x1              176000  double              

% line plot for reference
figure()
plot(t,data)
legend()

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% surface plot
[Nt,Nc] = size(data);
assert(numel(t) == Nt)
X = t(:).*ones(1,Nc+1);
Y = (1:Nc+1).*ones(Nt,1);
C = data(:,[1:end end]);
figure()
surface(X,Y,C,'EdgeColor','none')
set(gca(), ...
    'YDir','reverse', ...
    'YLim',[1 Nc+1], ...
    'YTick',(1:Nc)+0.5, ...
    'YTickLabel',"data"+(1:Nc))
colormap(jet())
colorbar()

[Alexander]

That is exactly what I'm looking for, thank you!

[Voss]

You're welcome!

Answer 2

[Sulaymon Eshkabilov]

Here is one example code how to get such plot figure:

D = readmatrix("SENSOR_Values.txt");
Time = 0:1:height(D)-1;
% Use y-values for Color mapping
Color1 = D(:,1);
Color2 = D(:,2);
Color3 = D(:,3); 
hold on
for ii = 1:width(D);
scatter(Time, D(:, ii), 20, D(:,ii), 'filled'); % 20 is the marker size
end
colormap(jet); % Choose a colormap
colorbar;      % Display colorbar to show the mapping
xlabel('Time, [s]');
ylabel('Temperature, [F]');
title('Colormap Based on Temperature Values');
hold off

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