Problem to read multiple .csv in a loop for.

Question

Tony Castillo 2020-10-22

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/622508-problem-to-read-multiple-csv-in-a-loop-for

评论： Tony Castillo 2020-10-22

Hi all,

I have one problem to read multiple ."csv" tables and also process them because appears this error message "Error using readtable (line 223)

Unable to open file 'Dailydata_(i).csv'."

%%%%Leer y extraer datos de una CSV
current_path = pwd;
close all
Irr_=ones(25,1);    
for i=1:2 
T = readtable('Dailydata_(i).csv', 'PreserveVariableNames', true);
I=T(:,3); 
A=table2array(I); %
Irr=A(1:25);
Irr(isnan(Irr))=0;
M=max(Irr);
m=mean(Irr);
size(Irr);
Irr_=[Irr];
cd(current_path);
end
z=ones(25,2);    
I2=([Irr_].*z);

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Rik 2020-10-22

Please do not post duplicates.

Have you tried learning to use the debugger to step through you code line by line?

If you would use the smart indentation, you would notice that you've put the cd inside your loop. Luckily it does nothing, as you didn't change the current directory (nor should you: readtable allows you to specify a full or relative path).

The line with Irr_=[Irr]; looks like you want to store something over several iterations of your loop. However, you aren't changing the variable at all here.

Tony Castillo 2020-10-22

Mr Rik, I apologize for creating a post twice, but in the first post the platforms got an error and it was the reason why I made another dealing with tha same topic.

You were right about Irr_=[Irr], I changed it to "Irr_=[Irr_, Irr];"

Thank you for your help

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