Colour plot vs Time on a circle

I have temp vs time data for 100 points along a circle.

I would like create a small animation of the temp vs time basedon colour of the circle.

(If not a circle I would atleast like to try it along a line. )

Is it possible somehow?

A sample/Example would be like this

This has 6 frames, with the color representing the temperature and frames representing the passage of time.

Here it is made as a contiuous diagram, with smooth gradients. If it is not possible, is it possible as discreet sections of a circle.

[Geoff Hayes]

Sankar - how would the animation work? Please explain and (if possible) provide a picture of what you would like to see.

[Sankar Ram T]

Geoff . Added a sample animation.

[darova]

Please attach the data

[Sankar Ram T]

Coloum 1 is Time (Sec)

Rest are temperatures of 20 Sectors

Answer 1

[Kelly Kearney]

It's not clear to me whether you've already created the circle plots in Matlab, or if you just sketched out your desire outcome.

If you haven't plotted them yet, I think using a simple patch is the easiest way to achieve that look. To animate, it depends on whether you just want to animate on screen or export to something like a gif. The example below shows the former.

% Some example data
 
t = linspace(0,1,100)'; % time coordinate, normalized
data = rand(100,3); % three time steps of random data
 
% Use patch to plot the circle
 
th = 2*pi*t;
rmin = 0.8; % inner radius
rmax = 1;   % outer radius
 
xouter = rmax.*cos(th);
xinner = rmin.*cos(th);
youter = rmax.*sin(th);
yinner = rmin.*sin(th);
 
x = [xouter; xinner(end:-1:1); xouter(1)];
y = [youter; yinner(end:-1:1); youter(1)];
c = [data; data(end:-1:1,:); data(1,:)];
 
axes
p = patch(x,y,c(:,1));
axis equal;
set(gca, 'visible', 'off');
set(p, 'edgecolor', 'none');
 
% Loop over to animate
 
for it = 2:size(data,2)
    pause(1);
    set(p, 'cdata', c(:,it));
end

[Sankar Ram T]

Frankly, I didn't understand the code fully. I ran it and something is happening. I tried loading my own data and it was not working very well. It is plotting a circle and it is colouring it but it looks more like random patchs and not like each seperarte sectors haveing some colour.

I am trying to understand the code, but can you use the data I have attached above and see whether the code is working as intended?

[Kelly Kearney]

Here's the example again, this time with your data and more comments:

% Your data
 
tmp = readtable('~/Downloads/10Sec - Copy.xls');
 
data = table2array(tmp(:,2:end))'; % sector x time array
sector = 1:size(data,1); % sector, 1,2,...20
 
% Step 1: upsample your data. This isn't strictly necessary but will allow
% your ring to look more like a circle than a 20-gon
 
secup = linspace(1,20,100)';
data = interp1(sector, data, secup); % new higher-res sector x time array
 
% Step 2: Calculate x- and y-coordinates of the ring
 
secnorm = (secup - min(secup))./(max(secup)-min(secup)); % normalize sector...
th = 2*pi*secnorm; % ... and then convert to angle between 0 and 2*pi
 
rmin = 0.8; % inner radius
rmax = 1;   % outer radius
 
xouter = rmax.*cos(th); % coordinates of outer ring (counterclockwise from right)
xinner = rmin.*cos(th);
youter = rmax.*sin(th); % coordinates of inner ring (counterclockwise from right)
yinner = rmin.*sin(th);
 
% ... to draw the ring, connect the outer circle counterclockwise, then the
% inner circle clockwise, and then back to the first point of the outer
% circle.
 
x = [xouter; xinner(end:-1:1); xouter(1)]; % ring x coords
y = [youter; yinner(end:-1:1); youter(1)]; % ring y coords
c = [data; data(end:-1:1,:); data(1,:)];   % color data corresponding to each vertex
 
% Prepare time label (just for reference)
 
tstr = cellstr(num2str(tmp.Time, '%6.4f')); % # time x 1 cell array
 
% Step 3: Plot using the color data for the first time step
 
axes;
p = patch(x,y,c(:,1)); % plot patch
axis equal; % set aspect ratio equal
set(gca, 'visible', 'off', 'clim', [0 1505]); % hide the axis box and ...
                                              % set the color limits to match the data
t = text(0, 1.1, tstr{1}, 'horiz', 'center'); % Add a text label with the time
set(p, 'edgecolor', 'none'); % hide the edges of the patch
colorbar('west'); % add a colorbar
 
% Step: Loop to animate, changing color data and time label
 
for it = 2:size(data,2)
    pause(0.01);
    set(p, 'cdata', c(:,it));
    set(t, 'string', tstr{it});
end

[Sankar Ram T]

By the time I undersood your pevious code, you made a improved version. 👍👍

I had worked around the previos code to plot my data. I found 2 bugs.

1) The top of the image has a 'patch'. The colours are not uniform there. What would cause that?

(May be the vertices on outer and inner are not lining up corretly???)

2)There is a jump in colour towards the right side of circle. I believe it is the start of the patch. Any way to smoothen this out?

I will go through the 2nd set of code, and get back. THANK YOU for the prompt reply.