Question

Write a MATLAB code to plot a contour graph of f(x, y) = x^2 + y^2 for −2 ≤ x ≤ 2 and −3 ≤ y ≤ 3. Use the interval of 0.1 in the grid.

Answer 1

clc;clear all
x=-2:0.1:2;      %creating a x vector with 0.1 space

y=-3:0.1:3;      %creating a y vector with 0.1 space
[X Y]=meshgrid(x,y);    % this gives meshgrid for the contour plot
A=X.^2+Y.^2;    %Assigning the Value of f(X,Y) to A
contour(X,Y,A) %gives the contour plot
xlabel('X');ylabel('Y');alabel('A')         %attaching labels to the axis
title('Contour plot f(x,y)=x^{2}+y^{2}')