2D plot of deformation data

Question

Sara 2023-3-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1923940-2d-plot-of-deformation-data

评论： William Rose 2023-3-7

Hi,

I have txt file with information of x and y coordnates and c as color data and u,v as defromation data which is for displacment.

I want to plor the 2D of the displacment with its color. what I was able to do is plot the data with no defromation, displacment, as shown in the image

my code is after I load the data.

x = data(:,1);
y = data(:,2);
c = data(:,3);
U = data(:,4);
V = data(:,5);
n = 500
[X, Y] = meshgrid(linspace(min(x),max(x),n), linspace(min(y),max(y),n));
ColorData = griddata(x,y,c,X,Y);
pcolor (X,Y,ColorData);

When I used the U and V I got this image

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Sara 2023-3-7

在 MATLAB Online 中打开

what I ment is switching the code from

ColorData = griddata(x,y,c,X,Y);

to

ColorData = griddata(U,V,c,X,Y);

but I will try to do your code in my code and see what will happen

Thank you

William Rose 2023-3-7

在 MATLAB Online 中打开

@Sara,

You said you wante d to switch the code from

ColorData = griddata(x,y,c,X,Y);

to

ColorData = griddata(U,V,c,X,Y);

I don;t think this will do what you want, because griddata is a 2D interpolation routine. In the first form, it assume you measured c at points x and y, and it interpolates those measurements to the gird X,Y. But U,V are not measurement locations - they are measured values.

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Answer 1

Mathieu NOE 2023-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/1923940-2d-plot-of-deformation-data#answer_1186515

在 MATLAB Online 中打开

hello again

basically used the same code for U and V and got these 3 plots

for ColorData

for U

for V

code :

data = readmatrix('data.txt');
x = data(:,1);
y = data(:,2);
c = data(:,3);
u = data(:,4);
v = data(:,5);
n = 500;
[X, Y] = meshgrid(linspace(min(x),max(x),n), linspace(min(y),max(y),n));
ColorData = griddata(x,y,c,X,Y);
U = griddata(x,y,u,X,Y);
V = griddata(x,y,v,X,Y);
figure(1), 
pcolor(X,Y,ColorData);
shading('interp')
colormap('jet');
figure(2), 
pcolor(X,Y,U);
shading('interp')
colormap('jet');
figure(3), 
pcolor(X,Y,V);
shading('interp')
colormap('jet');