How to create a matrice from selected rows from other matrices

Question

Jonathan Demmer 2021-3-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/776467-how-to-create-a-matrice-from-selected-rows-from-other-matrices

评论： Rik 2021-3-18

Hello all,

I would like to select a specific row (4187) from n matrices (n =20) and add these rows in a new matrice. I wrote the code below, I thought that every file loaded will add the line selected in the new matrice. However after the first iteration the matrice holy_lat_final becomes a matrice (1,1436) instead of staying (20,1436), and so the second iteration cant be done... can someone help me pelase?

file_lat_1 = 'October_01_2014_surface_lat_##.mat';
file_lon_1 = 'October_01_2014_surface_lon_##.mat';
Holy_lat_final = zeros (20,1436);
Holy_lon_final = zeros (20,1436);
n = 20; % number particles release per site
for i = 1:n % particle release
    file_lat_1(29:30)=sprintf('%02.0f',i);
    file_lon_1(29:30)=sprintf('%02.0f',i);
    Holy_lat = load(file_lat_1);
    Holy_lon = load(file_lon_1);
    Holy_lat_final = Holy_lat_final(i,:) + Holy_lat.lat(4187,1:1436);
    Holy_lon_final = Holy_lon_final(i,:) + Holy_lon.lon(4187,1:1436);
end

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Answer 1

Rik 2021-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/776467-how-to-create-a-matrice-from-selected-rows-from-other-matrices#answer_651212

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You overwrote the entire variable. See the edits I made to your code.

file_lat_1_fmt = 'October_01_2014_surface_lat_%02.0f.mat';
file_lon_1_fmt = 'October_01_2014_surface_lon_%02.0f.mat';
n = 20; % number particles release per site
Holy_lat_final = zeros (n,1436);
Holy_lon_final = zeros (n,1436);
for i = 1:n % particle release
    file_lat_1(29:30)=sprintf(file_lat_1_fmt,i);
    file_lon_1(29:30)=sprintf(file_lon_1_fmt,i);
    Holy_lat = load(file_lat_1);
    Holy_lon = load(file_lon_1);
    Holy_lat_final(i,:) = Holy_lat.lat(4187,1:1436);
    Holy_lon_final(i,:) = Holy_lon.lon(4187,1:1436);
end

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Jonathan Demmer 2021-3-18

Perfect!! thank you very much!!!

Rik 2021-3-18

You're welcome. If my answer solved your issue, please consider marking it as accepted answer, if not, feel free to post a comment with your remaining issues.

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