% "Visualization" Sample commands
clear all
%
% Set up the limits in x and y
xORy=linspace(-10,10);
%
% The "meshgrid" command gives X and Y matrices that run over these values
[X,Y]=meshgrid(xORy,xORy);
%
% Now calculate, element by element, the function of the two variables
fBowl=X.^2+Y.^2;
%
% Make a contour plot, pretty much like what we did in Mathematica
contour(X,Y,fBowl)
pause
%
% Here is a "surface" plot of the same function
surf(X,Y,fBowl)
pause
%
% Use "quiver" to plot the vector field (y,-x), but use a more coarse grid
xORy=-10:10;
[X,Y]=meshgrid(xORy,xORy);
quiver(X,Y,Y,-X)