Project - Data Handling and Interpolation

data = xlsread('VI','A2:B25');

V = data(:,1); % import data from xlsx file given by question

I = data(:,2);

hold on

VInt = -17.3:0.1:0.9 % Vint for interpilation

VI = interp1(V,I,VInt)

eq1 = polyfit(V,I,2)

V2 = 1:1:24;

I2 = polyval(eq1,V2,'p')

VV =[-17.2 -17.1 -13.8 -13.5 -13.0 -12.5 -11 -9 -5.76 -6 -1 0.11 0.25 0.5 0.61]% argument for write data form of voltage

I3 = polyval(eq1,VV,'c*') % current for writing in text file

data1 = [VV;I3]

data_write = fopen('writeVI.txt','w'); % write data in text file voltage/current

fprintf(data_write,'VoltAmp %f\n',data1);

plot(V,I,':',V,I2,'g--',VV,I3,'r--o',VInt,VI,'b*'); xlabel('Voltage'); ylabel('Current')