Project - Data Handling and Interpolation

%Project :In a laboratory experiment, data of voltage and current has been recorded and the same is attached in an excel file ( Click on this link VI.xlsx ). Read the excel file in the Matlab program and perform the interpolation in the range of -17.3:0.1:0.9. Generate the interactive plot for the interpolated data and store them in a text file.

clear;

clc;

%Reading the data from Excel file

VI = xlsread('VI.xlsx');

V = VI(:,1);

I = VI(:,2);

%Geting the voltage range for interpolation

Vrange = -17.3:0.1:0.9;

%Interpolate the current for given voltage and plote the raw voltage v\s raw current and given voltage v\s interpolated current.

Iinterpolated = interp1 (V,I,Vrange,"spline");

%Writing the given voltage and interpolated current in a text file

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

fprintf(fileID, '%f, %f\n', Vrange,Iinterpolated);

fclose(fileID);

plot(V,I,'ok'); grid on; hold on; title ('Voltage v/s current');

xlabel('Voltage(volts)'); ylabel ('Current(Amps)');

plot(Vrange,Iinterpolated, 'r-');

%Geting the Voltage range for corrent interpolating and entering to text file.

Vreq =[-17.2 -13 -11 -9 -6 -1 0.11 0.25 0.5 0.61 0.66];

Ireq = interp1(V,I, Vreq, "spline");

VIreq = [Vreq;Ireq];

%Appending the interpolated data into the text file.

fileID = fopen('VIinterpolated.txt','a');

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

fclose(fileID);

>> Vreq

Vreq =

-17.2000 -13.0000 -11.0000 -9.0000 -6.0000 -1.0000 0.1100 0.2500 0.5000 0.6100 0.6600

>> Ireq

Ireq =

-28.1734 -2.4298 -1.6103 -1.1164 -0.7445 -0.2906 0.0012 -0.0001 0.1700 1.5665 4.8092

also find the attached file for the output