Saving a .mat file in csv format - matlab

Question

I have a .mat file and the data structure is as below.
Data =
struct with fields:
axis1: [25626600×1 double]
axis2: [25626600×1 double]
axis3: [25626600×1 double]
datenum: [25626600×1 double]
sample_rate: 30
serial_number: 'MOS2D10171145'
I want this .mat file to be save as a csv file.
I tried this code but it gives me this error.
csvwrite('FileName.csv', Data);
Undefined function 'real' for input arguments of type 'struct'.
Error in dlmwrite (line 189)
str = sprintf('%.*g%+.*gi',precn,real(m(i,j)),precn,imag(m(i,j)));
Error in csvwrite (line 42)
dlmwrite(filename, m, ',', r, c);

Answer 1

as explained by Wolfie, you cannot do this direclty, because your sample_rate and your serial_number variables cannot go direclty in your CSV.
A solution could be to put these 2 variable in your CSV filename to keep them.
%% Parameters
cdSAVE='YOUR_PATH'; % PUT YOUR SAVING PATH
%% Variables (put your own)
axis1 = zeros(250,1);
axis2 = zeros(250,1)+1;
axis3 = zeros(250,1)+2;
datenum = zeros(250,1)+3;
sample_rate = 30;
serial_number = 'SERIAL_NUMBER';
%% Make a matrix with what you can
Matrix = zeros(length(axis1),4);
Matrix(:,1)=axis1;
Matrix(:,2)=axis2;
Matrix(:,3)=axis3;
Matrix(:,4)=datenum;
%% Convert to table (to have the headers written in your csv file)
T = array2table(Matrix);
T.Properties.VariableNames(1:4) = {'axis1','axis2','axis3','datenum'};
%% Create a the filename with the 2 other datas
fileName = char(strcat('Extract_CSV_Sample_rate_',string(sample_rate),'_Serial_Number_',serial_number,'.csv'));
%% Writing
fullPathFileName=char(strcat(cdSAVE,"\",fileName));
%% Choose what you want :
%% Here for just the matrix with csvwrite
csvwrite(fullPathFileName,Matrix);
%% Here with headers also with writetable
writetable(T,fullPathFileName)
And the CSV name will be : Extract_CSV_Sample_rate_30_Serial_Number_SERIAL_NUMBER.csv