Project - Data Handling and Interpolation

%% data handling and interpolation

clear all

close all

clc

A= xlsread('VI.xlsx'); % importing the xlxs from xl to matlab

v= A(:,1); % voltage values from xl column 1

i= A(:,2); % current values from xl column 2

v1= -17.3:0.1:0.9; % range given in quetion

ib1= interp1(v,i,v1); %interpolating the values

figure(1)

plot(v,i,'r',v1,ib1,'b--'); % plotting the interpolated values with the voltage and current.

title('linear interpolation'); %title of figure 1

xlabel('voltage');

ylabel('current');

legend('original','interpolated');

vs=[-17.2000 -13 -11 -9 -6 -1 0.1100 0.2500 0.5000 0.6100 0.6600]; % given values in quetion

i2=interp1(v,i,vs);

figure(2)

plot(vs,i2,'g');

title('interpolation'); %title of figure 2

xlabel('volatge');

ylabel('current');

vsi2=[vs;i2];

fid=fopen('voltage_current.txt','w'); % save in text file

fprintf(fid,'%55s %10s\n','voltage','current');

fprintf(fid,'%5f %10f\n',vsi2);

fclose(fid);