Method sharing of saving data to CSV file in MATLAB

A classmate asked a question , How to make matlab The data in the variable area is saved to csv In the document , So share Matlab Save data to csv Method of file .csv It's actually a txt, It's just csv It has a specific format txt nothing more , for instance , Edit a txt file , The contents are as follows

Change the suffix of this file name to csv, newly build Text document .csv, Then use excel open

So in matlab Save as csv In fact, and save as txt The method is similar to

1、 Method 1：table

% Matrix to be saved A=[1 2 3;4 5 6; 7 8 9];% Line name m=['m1';'m2';'m3']; % Column name col={'test' 'c_1', 'c_2', 'c_3'}; % Generate table , Generate by column result_table=table(m,A(:,1),A(:,2),A(:,3),'VariableNames',col);% Save table writetable(result_table, 'test.csv');

Use to assemble the data into table type , then writetable

If you don't need to set the header , Direct input ​​​​​​​

result_table1=table(A)writetable(result_table1, 'test1.csv');

But be careful ,writetable A header will also be generated according to the variable name , How to cancel this has not been found yet , Know how friends can confide in me

2、fopen

csv Format is a file that separates data with commas . The data between lines is separated by commas , Use... Between lines \n Separate . use MATLAB Write data to csv When you file , First use fopen Create a file with write permission , And then use fprintf Function writes data one by one . The data without newline is separated by commas , For line feed \n.​​​​​​​

fid = fopen('test.csv', 'w+', 'n', 'utf8');    %  Create a csv file for i=1:3    fprintf(fid, '%d,%d,%d\n', A(i,1),A(i,2),A(i,3)); %  a line 3 Data , Separate with commas ; Add at the end of each line \n Line break end

use fprint There is no method 1 The problem of automatically generating headers in