Not looping over all the files

Question

muhammad choudhry ，2022-6-10

0
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Direct link to this question

https://ww2.mathworks.cn/matlabcentral/answers/1737845-not-looping-over-all-the-files

评论： muhammad choudhry ，2022-6-10

workspace.png

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 2022-6-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1737845-not-looping-over-all-the-files#answer_982920

编辑：KSSV 2022-6-10

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