Project - Data Handling and Interpolation

Data = xlsread('VI.xlsx'); %d read the excel file

V = Data(:,1); %d import data from excel file

I = Data(:,2); %d import data from excel file

t = -17.3:0.1:0.9; %d give interpolation range

A = []; %d creating matrix for save interpolation data

y = interp1(V,I,t,'spline'); %d using interp1 for find interpolate data

A = [y]; %d interpolated data save in matrix

plot(V,I,'b-','MarkerFaceColor','g','linewidth',1.5); %d plot graph of given data

hold all; %d hold all plots

plot(t,y,'ro','linewidth',1); %d plot graph range vs interpolate data

grid; %d give grid lines

title('Voltage and Current Data Interpolation'); %d give title to graph

xlabel('Voltage (V)');ylabel('Current (I)'); %d labeling graph

xticks([-18:0.5:2]); %d select ticks of x axis

yticks([-40:5:120]); %d select ticks of y axis

xticklabels({'V=',-18:0.5:2}); %d labeling ticks

yticklabels({'I=',-40:5:120}); %d labeling ticks

legend('Data line','Interpolation Line'); %d add legend in graph

text(0.8,39.0701,'Interpolation line','FontSize',15); %d add text

text(-16,-6,'Data line','FontSize',15); %d add text

filename=fopen('Matlab_project.txt','w'); %d open txt file to save interpolate data

writematrix(A','Matlab_project.txt'); %d save interpolated data to txt file

print('Matlab_Project','-dpdf'); %d print graph in pdf formate

fclose(filename); %d closing txt file