can i use Wavelet transform to extract frequency of voltage and current signals?

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Machine Learning Enthusiast
I want to extract coefficients of voltage and current signals to give inputs to my Neural Network.or is there anyeasy way to extract the frequency components?i tried this code though:
numcsvfiles = 2; % Number of csv files
a4_matrix_Concatenated = [];
for z = 1:numcsvfiles
filename= strcat(int2str(z),'.csv'); % Suppose the csv files are named: 1.csv, 2.csv, ...
name = strcat('a4_matrix_csv',int2str(z),'.mat');
clear a4_matrix
for k = 1:6
display(['CSV file number ' num2str(z) ' , Column number ' num2str(k)])
% Read the z-th csf file
aux_var = csv(:,(k));
%figure(1);
%plot(aux_var);
N=4;
% Calculate the wavelet decomposition
[C,L] = wavedec(aux_var,N,'db1'); % Daubechies 1 Wavelet
%tam_a4=L(1);
%a4 = C(1:tam_a4,1);
%cA4 = appcoef(C,L,'db1',4);
% Reconstruct the level 4 approximation from the wavelet
A4 = wrcoef('a',C,L,'db1',N);
a4_matrix(:,k)=A4;
%figure(2);
%plot(A4);
end
a4_matrix_Concatenated = [a4_matrix_Concatenated;a4_matrix];
% save(name,'a4_matrix'); % Save the matrix with a4 coefficients to each csv file
end
save('a4_matrix_Concatenated.mat','a4_matrix_Concatenated')
%%Test plot
% 2.csv - current_3 - graph and a4 graph
figure(1);
plot(aux_var);
figure(2);
plot(A4);

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