How can I create for loop on contourf and save plots somewhere?

Question

Behrooz Daneshian 2023-2-7

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回答： Les Beckham 2023-2-7

POFDE.mat

Hi all,

I need to create a for loop in my code to make multiple contour plots. I use the following code to plot just 1 contour map based on column 3 of "data"(data(:,3)). What I want to do is to plot multiple contour maps based on column 3, 4, 5, 6, and 7 of "data" and save all of them with a specific label somewhere in my computer. Label for the first plot should be "the probability of frost depth exceedance of 1foot", for the second plot "the probability of frost depth exceedance of 2 feet", and so on. (The last plot's label : "The probability of frost depth exceedance of 5 feet).

Can anyone help me with this?

data = cell2mat(POFDE);
I = scatteredInterpolant(data(:,[1 2]),data(:,3));
[lat,lon] = meshgrid(unique(data(:,1)),unique(data(:,2)));
contourf(lon,lat,I(lat,lon),'ShowText','on')
colorbar

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Answer 1

Fifteen12 2023-2-7

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编辑：Fifteen12 2023-2-7

在 MATLAB Online 中打开

for i = 1:width(data)
    I = scatteredInterpolant(data(:,[1 2]),data(:,i));
    [lat,lon] = meshgrid(unique(data(:,1)),unique(data(:,2)));
    fig = contourf(lon,lat,I(lat,lon),'ShowText','on')
    colorbar
    label = sprintf('the probability of frost depth exceedance of %d feet.png', i);
    saveas(fig, label)
end

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Fifteen12 2023-2-7

编辑：Fifteen12 2023-2-7

Note that this doesn't change the first label from 'feet' to 'foot'

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Answer 2

Les Beckham 2023-2-7

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1908425-how-can-i-create-for-loop-on-contourf-and-save-plots-somewhere#answer_1166100

在 MATLAB Online 中打开

POFDE.mat

I'm not sure I believe this data since we are seeing probablities of > 1 in some cases (perhaps an interpolation/extrapolation artifact). However, here is how you could do what your are asking (if I understand correctly):

load('POFDE.mat');

data = cell2mat(POFDE);

[lat,lon] = meshgrid(unique(data(:,1)),unique(data(:,2)));

for i = 1:(size(data, 2)-2)

figure

I = scatteredInterpolant(data(:,[1 2]), data(:,i+2));

contourf(lon, lat, I(lat,lon), 'ShowText', 'on');

colorbar

title(sprintf('the probability of frost depth exceedance of %d feet', i))

exportgraphics(gca, sprintf('FrostPlot_%d_feet.png', i))

end

Warning: Duplicate data points have been detected and removed - corresponding values have been averaged.