Project - Data Handling and Interpolation

Vol_Cur = readmatrix('VI_project.xlsx'); %reading the data from excel and loading it into Vol_Cur

V=Vol_Cur(:,1); %storing Voltage data to 'V'

I=Vol_Cur(:,2); %storing current data to 'I'

Vq=-17.3:0.1:0.9;

Iq1=interp1(V,I,Vq); %performing the linear interpolation for range Vq

Iq2=interp1(V,I,Vq,'spline'); %performing the spline interpolation for range Vq

figure(1)

plot(V,I,'o',Vq,Iq1,':.'); %plotting

grid;

xlabel('V(volts)'); %labelling

ylabel('I (mAmp)');

title('Current vs Voltage'); %title

gtext('Linear Interpolation')

figure(2)

plot(V,I,'o',Vq,Iq2,':.');

grid;

xlabel('V(volts)');

ylabel('I (mAmp)');

title('Current vs Voltage');

gtext('Spline Interpolation');

%writing the interpolated data to output file, VI_interpolated_data.txt

Fid=fopen('VI_interpolated_data.txt','w');

fprintf(Fid,'%f\n',Iq1);

fclose(Fid);