% MidPeaks.m Peak functions for Midter Problem 3 and 4 
% Show the 'Peaks' function; from the Matlab Help,
% Mesh command.
% The peaks function is:
% z =  3*(1-x).^2.*exp(-(x.^2) - (y+1).^2) ...
%   - 10*(x/5 - x.^3 - y.^5).*exp(-x.^2-y.^2) ...
%   - 1/3*exp(-(x+1).^2 - y.^2);
% It is convenient to view over an x,y space of
% -2 to +2 with an interval (dx = dy) of about
% 0.05 to 0.2
% Peaks can also be viewed with plot3, surf, pcolor, etc.
close all
clear all
clc
format compact

[X,Y] = meshgrid(-2:.125:2);
Z = peaks(X,Y);
meshc(X,Y,Z);
axis([-2 2 -2 2 -10 5])

%% Multiply the 2-D array amplitudes by 2

%% Add random noise (randn) to the array
randn('seed',igiven) % set random number seed 

%% Produce a contour plot