x,y,z plot and temperature

Question

Michela Longhi 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372587-x-y-z-plot-and-temperature

评论： Michela Longhi 2017-12-13

Hi,

I am interested in visualizing temperature distribution on a 3D plot like point.

I have a 3d path, for each point I have x,y,z coordinates for its position and corresponding temperature. the coordinates are "x" "y" "z" and the temperature "temperature".

How can I draw a 3d-plot from these x,y,z and color them with my temperature value?

Thanks.

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Answer 1

Honglei Chen 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372587-x-y-z-plot-and-temperature#answer_295943

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Is it something like this?

x = rand(100,1);
y = rand(100,1);
z = rand(100,1);
t = rand(100,3);
scatter3(x,y,z,20,t);

HTH

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Michela Longhi 2017-12-13

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Answer 2

Image Analyst 2017-12-12

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https://ww2.mathworks.cn/matlabcentral/answers/372587-x-y-z-plot-and-temperature#answer_295968

在 MATLAB Online 中打开

Try this:

% Make sample parameterized curves for test data.
t = 1 : 100
x = cosd(t);
y = sind(t);
z = t/50;
minTemperature = 20;
maxTemperature = 80;
% Say that temps are random int he range of 20 to 80 degrees.
temperature = minTemperature + (maxTemperature - minTemperature) * rand(1, length(t));
% Now we have our sample/test data, and we can begin.
% First create a colormap.
numPoints = length(x);
cmap = hsv(numPoints);
% Now we need to make those temperatures into a colormap.
% First take temperatures and make it so that minTemperature is an index of 1
% and the max Temperature is an index of length(x);
minTemperature = min(temperature);
maxTemperature = max(temperature);
% Get a percentage of the way the temperatures are from max to min.
percentage = (maxTemperature - temperature) / (maxTemperature - minTemperature)
% Find the index for each temperature in the range 1 to the number of colors in our colormap.
indexes = round(percentage * (numPoints - 1)  + 1);
tempColors = cmap(indexes, :);
scatter3(x, y, z, 14, tempColors, 'filled');