Not looping over all the files

Question

muhammad choudhry 2022년 6월 10일

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https://kr.mathworks.com/matlabcentral/answers/1737845-not-looping-over-all-the-files

댓글: muhammad choudhry 2022년 6월 10일

채택된 답변: KSSV

workspace.png

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Hi,

I am reading the column_13 from 79 csv files in a folder then taking the mean of each column from each file and want to save 79 values of means in a separate file but struggling to do that. Below is the code. Please see the picture attached shows the workspace and error.

Code:

close all; clear all; clc;
P = 'F:\3-PIV_Experimental_Data\Calculations_TurbulentIntensity\line_Data\Elliptical_Side\Length\DesignPoint\110_outlet';
Q = 'F:\3-PIV_Experimental_Data\Calculations_TurbulentIntensity\line_Data\Elliptical_Side\Length\DesignPoint';
S = dir(fullfile(P,'*.csv'));
N = natsortfiles({S.name});
% Pre-allocate output vector
TurbulentFluctuationArray_Mean=zeros(numel(N), 1); % matrix of results that you will fill later in your "for cycle"
% loop over the file names
for idx = 1:numel(N,1);
    data = readtable( fullfile(P, N{idx}) ); % read the csv files
    col_13 = data(:,13);     % Get the 13th column
    TurbulentFluctuation_array(idx) = table2array(col_13)  %convert the table to arrays
    TurbulentFluctuationArray_Mean(idx) = mean(TurbulentFluctuation_array); 
end
csvwrite(fullfile(Q, 'TF_mean.csv'), TurbulentFluctuationArray_Mean(idx)); % its only saving first term value TurbulentFluctuationSquare_Mean

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Answer 1

KSSV 2022년 6월 10일

1
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이 답변에 대한 바로 가기 링크

https://kr.mathworks.com/matlabcentral/answers/1737845-not-looping-over-all-the-files#answer_982920

편집: KSSV 2022년 6월 10일

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close all; clear all; clc;
P = 'F:\3-PIV_Experimental_Data\Calculations_TurbulentIntensity\line_Data\Elliptical_Side\Length\DesignPoint\110_outlet';
Q = 'F:\3-PIV_Experimental_Data\Calculations_TurbulentIntensity\line_Data\Elliptical_Side\Length\DesignPoint';
S = dir(fullfile(P,'*.csv'));
N = natsortfiles({S.name});
% Pre-allocate output vector
TurbulentFluctuationArray_Mean=zeros(numel(N), 1); % matrix of results that you will fill later in your "for cycle"
% loop over the file names
for i = 1:numel(N);
    data = readtable( fullfile(P, N{i}) ); % read the csv files
    col_13 = data.(13) ;     % Get the 13th column   
    TurbulentFluctuationArray_Mean(i) = mean(col_13); 
end
csvwrite(fullfile(Q, 'TF_mean.csv'), TurbulentFluctuationArray_Mean); % its only saving first term value TurbulentFluctuationSquare_Mean