Project - Data Handling and Interpolation

Q1:-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.

solution:-

close 
clear
clc
data=readmatrix("VI.xlsx"); 
%readmatrix helps to read the matrix in the file
v=data(:,1);%v as V (Volt)
i=data(:,2);%i as mAmp
r=-17.3:0.1:0.9;%r as interpolation in the range
int_1=interp1(v,i,r);%interpolation with linear method
int_2=interp1(v,i,r,"spline");%interpolation with spline method
figure(1)
plot(v,i,'r',r,int_1,'b.');grid;
%plot is used to plot 2d line,grid to add grid in plot
legend('Original','Linear Interpolation');
%legend is used to add legend to axes
title('Linear Interpolation')
%title to add title for the plot
xlabel('Temperature');ylabel('Altitude')
%xlabel to name axis ylabel to name yaxis
figure(2)
plot(v,i,'r',r,int_2,'b.');grid;
%plot is used to plot 2d line,grid to add grid in plot
legend('Original','Spline Interpolation');
%legend is used to add legend to axes
title('Spline Interpolation');
%title to add title for the plot
xlabel('Temperature');ylabel('Altitude');
%xlabel to name axis ylabel to name yaxis
data_of_interpolation=[r' int_2' int_2'];
writematrix(data_of_interpolation,'interpolation data.txt')

output of interpolation in txt file:-

codes used in the project:-

• close:-close command helps to close one or more figures
• clear:-clear command helps to clear the data or item in the work space
• clc:-clc command helps to clear the data or item in command windows
• readmatrix:-readmatrix helps to read the matrix from the file
• interp1:-interp1 helps in interpolation of 1d data
• plot:-plot command is used to draw 2d line plot
• grid:-grid command is used to add grid in the plot
• xlabel:-xlabel command is used to label the Xaxis
• ylabel:-ylabel command is used to label the Yaxis
• title:-title command is used to name the title of the plot
• legend:-legend command is used to add legend to the axes
• writematrix:-write matrix helps to write a matrix in a file
• figure:-figure helps to create a single or multiple figure window