how to import multiple file and calculate a mean?

Question

Ernest Adisi 2018-8-31

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/416984-how-to-import-multiple-file-and-calculate-a-mean

编辑： Stephen23 2018-8-31

B02490.txt

I have this code which works fine. it take one file and reshapes into matrices to plot a contour. i now want multiple files to import then calculate and plot a mean of the amount of files. can you show using a simple for loop please.

it takes the data from the 4 columns in the uploaded file and reshapes them into 4 matrices.

   B = load ('B02490.txt');
  c = 214;
  r = length(B)/c;
U = zeros(r,c);
V = U;
for j=1:r
    idx1 = (j-1)*c +1;
    idx2 = j*c;
    U(j,:) = B(idx1:idx2,3);
    V(j,:) = B(idx1:idx2,4);
    y(j) = B(idx1,2);
end
Nx = r;
Ny = c;
uu = zeros(Ny,Nx);
vv = uu;
tmp = zeros(r,1);
for i=1:Nx
    vv(:,i) = U(i,:);
end
jj=1;
for i=1:c
    for j=1:r
        idx = r+1-j;
        tmp(j) = -V(idx,i);
    end
    uu(jj,:) = tmp;
    jj = jj+1;
end

pix_m=0.1215e-3;

for i=1:r
    idx = c*(i-1)+1;
    x(i) = B(idx,2);
end
y = B(1:c,1);
xm = x.*pix_m;
ym = y.*pix_m;
dt=0.0005;
uu = uu.*pix_m./dt;
vv = vv.*pix_m./dt;
[X,Y] = meshgrid(xm,ym);
figure
contourf(X,Y,vv,10)

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Answer 1

KALYAN ACHARJYA 2018-8-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/416984-how-to-import-multiple-file-and-calculate-a-mean#answer_334933

编辑：KALYAN ACHARJYA 2018-8-31

在 MATLAB Online 中打开

   %Save all files in symmetrically before doing the operation 
   %Names for example f1,f2,f3...
   %Save the folder of filess in the current directory
   path_directory='folder_name_here'; 
   original_files=dir([path_directory '/*.txt']); 
   for k=1:length(original_files)
      filename=[path_directory '/' original_files(k).name];
      file_t=load('filename.txt');
     % Next do your operation and finding
     %After read one file >>Main Code here
     %After that Next iteration for next file
  end