Project - Data Handling and Interpolation

Matlab Basic Project

Interpolation:

Script:

%To read dat from given excel file

V=xlsread('VI.xlsx','A2:A25'); %to read voltage data

I=xlsread('VI.xlsx','B2:B25'); %to read current data

%ploting of given data

plot(V,I,'b*');

hold;

t=-17.3:0.1:0.9; % given interpolation range

%performing linear interpolation

figure(1);

V1=interp1(V,I,t,'linear'); % use of linear interpolation function

plot(t,V1,'r--'); % ploting of interpolated values

title('Linear interpolation curve');

xlabel('V (volts)');

ylabel('I (Amps)');

legend('Data point provided', 'Misssing Data points');

% performing Spline interpolation

figure(2);

V1=interp1(V,I,t,'spline'); % use of spline interpolation function

plot(t,V1,'r--'); % ploting of interpolated values

title('Spline interpolation curve');

xlabel('V (volts)');

ylabel('I (Amps)');

legend('Data point provided', 'Misssing Data points');

% to save the interpolated values into text file

fileID=fopen('interp_data.txt','w');

fprintf(fileID,'%10s %10s\n', 'V (volts)', 'I (Amps)');

fprintf(fileID,'%f %f\n',V1);

fclose(fileID);

Result: