Project - Data Handling and Interpolation

%Voltage and Current Data from VI.xlsx file is extracted using read matrix

%function as well as the time range is set according to the given range

%initially interp1 command is used by default after that spline operation

%added to the interp1 to differentiate the linear interpolated data and

%spline interpolated data both data are plotted in different figures and

%both data are stored in different text files

V = readmatrix('VI.xlsx','Sheet',1,'Range','A2:A25');

I = readmatrix('VI.xlsx','Sheet',1,'Range','B2:B25');

T = -17.3:0.1:0.9;

Y = interp1(V,I,T);%linear interpolation

Y1 = interp1(V,I,T,'spline');%spline interpolation

figure(1);

plot(V,I,'b-',Y,T,'r-');

title('linear interplation');

grid;

figure(2);

plot(V,I,'m-',Y1,T,'g-');

grid;

title('spline interpolated');

writematrix(Y,'interpolated_data.txt','Delimiter',' ');%delimiter is used to separate columns with space

writematrix(Y1,'spline_interpolated_data.txt','Delimiter',' ');