how to create a mean velocity matrix from multiple .dat files and plot the mean profile?

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Ernest Adisi 2018년 7월 31일

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https://kr.mathworks.com/matlabcentral/answers/412968-how-to-create-a-mean-velocity-matrix-from-multiple-dat-files-and-plot-the-mean-profile

댓글: jonas 2018년 8월 9일

I have a folder of x no of *.dat files. So far I've imported 1 file and reshaped the columns to get matrices for each column. e.g for 1 dat file:

filename='B00049.dat';

delimiterIn= ' ';

headerlinesIn = 3;

A= importdata(filename,delimiterIn,headerlinesIn);

%% Matrices%%%%

c = 214;%columns i

r = 134;%rows j

dt= 0.0005;

x=reshape(A.data(:,1),r,c);

y=reshape(A.data(:,2),r,c);

u=reshape(A.data(:,3),r,c);

v=reshape(A.data(:,4),r,c);

I now want to import multiple files and creat a mean velocity matrix fro u and v then plot a profile. How can this be done ? Thanks

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jonas 2018년 7월 31일

Can you provide two of your .dat files?

Ernest Adisi 2018년 7월 31일

thanks for the response, i'm trying to create a path to the folder containing all the files then perform a loop in order to make the 4 matrices for each file, then finally create a mean velocity matrix from the average of the last two columns in the 2 dat files. Hope that makes sense

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jonas 2018년 7월 31일

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https://kr.mathworks.com/matlabcentral/answers/412968-how-to-create-a-mean-velocity-matrix-from-multiple-dat-files-and-plot-the-mean-profile#answer_331124

편집: jonas 2018년 7월 31일

MATLAB Online에서 열기

files=dir('*.dat') %If files are in current dir, otherwise enter entire path
%%Preallocate some cells
x=cell(1,numel(files))
y=cell(1,numel(files))
u=cell(1,numel(files))
v=cell(1,numel(files))
%%Loop over all files
for i=1:numel(files)
  filename=files(i).name
  delimiterIn= ' ';
  headerlinesIn = 3;
  A= importdata(filename,delimiterIn,headerlinesIn);
  c = 214;%columns i
  r = 134;%rows j
  dt= 0.0005;
%%Save results
  x{i}=reshape(A.data(:,1),r,c);
  y{i}=reshape(A.data(:,2),r,c);
  u{i}=reshape(A.data(:,3),r,c);
  v{i}=reshape(A.data(:,4),r,c);
end

When you have all the data stored in cells, you can concatenate along the third dimensinon and take the average. I assume all files share the same size?