How to reshape values to use meshgrid and pdeplot

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Patrick Frey 2024-4-3

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https://ww2.mathworks.cn/matlabcentral/answers/2102336-how-to-reshape-values-to-use-meshgrid-and-pdeplot

评论： Cris LaPierre 2024-4-5

Hello, I want to use pdeplot. I have x-,y-coordinates and values for different timesteps. How must the values be transformed to use pdeplot?

data = [1, 1, 1, 20, 21, 22, 23;
    1, 1, 2, 25, 26, 27, 28;
    1, 2, 1, 30, 31, 32, 33;
    1, 2, 2, 35, 36, 37, 38;
    2, 1, 1, 40, 41, 42, 43;
    2, 1, 2, 45, 46, 47, 48;
    2, 2, 1, 50, 51, 52, 53;
    2, 2, 2, 55, 56, 57, 58];
x = unique(data(:, 1)); % x-coordinates
y = unique(data(:, 2)); % y-coordinates
temperature = data(:, 3:end); % temperature
% meshgrid form the coordinates
[X, Y] = meshgrid(x, y);

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Patrick Frey 2024-4-5

编辑：Patrick Frey 2024-4-5

在 MATLAB Online 中打开

I would likte to plot the temperture of a solid geometry defined by the coordinates..

Something like this

T = thermalresults.Temperature;
msh = thermalresults.Mesh;
pdeplot(msh,XYData=T(:,10),Contour="off",ColorMap="jet")

Cris LaPierre 2024-4-5

It looks like you have a 3d object, not 2D. That means there are 4 temperatures associated with each point. How are we to interpret those 4 temperatures? Do they represent tempurature over time? If so, which ones shoudl be used for creating the plot?

Consider looking at the following examples

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