Project - Data Handling and Interpolation

% reading xls file and storing its value as a table in variable z

z = xlsread('VI.xlsx');

 

V=z(:,1); % assigning 1st column to V

I=z(:,2); % assigning 2nd column to I

V1= -17.3:0.1:0.9; % storing new points as V1

V1 =V1';

I1 = interp1(V,I,V1); % interpolating new I as I1

% yq2 = interp1(x,y,xq,'spline');

figure(1)

plot(V,I,'o',V1,I1,':'); %ploting interpolated value

title('Linear Interpolation')

% figure(2)

% plot(x,y,'o',xq,yq2,':');

% grid;

% title('Spline Interpolation')

z_updated = cat(2,V1,I1);

writematrix(z_updated,'VI_updated.txt','delimiter',',') % writing the interpolated values in a txt file