Project - Data Handling and Interpolation

Soultion :

Interpolation:

Input:

A = xlsread('VI.xlsx');
V = A(:,1);
I = A(:,2);
plot(V,I);
hold on;
B = -17.3:0.1:0.9;
x1 = interp1(V,I,B,'spline');
plot(V,I,'m',B,x1,"o");
grid on;
title('spline interpolation');
xlabel('current');
ylabel('Voltage');
VV = -17.2:0.1:0.61;
x2 = interp1(V,I,VV);
x3 = [VV x2];
fid = fopen('text.txt','w');
fprintf(fid,'%6s %12s\n','VV','x2');
fprintf(fid,'%6.2f %12.8f\n',x3);
fclose(fid);

Output:

Text format file: