peaks
Example function of two variables
Syntax
Z = peaks;
Z = peaks(n);
Z = peaks(V);
Z = peaks(X,Y);
peaks(...)
[X,Y,Z] = peaks(...);
Description
peaks is a function of two variables, obtained
by translating and scaling Gaussian distributions, which is useful
for demonstrating mesh, surf, pcolor, contour, and so on.
Z = peaks; returns a 49-by-49
matrix.
Z = peaks(n); returns
an n-by-n matrix.
Z = peaks(V); returns
an n-by-n matrix, where n
= length(V).
Z = peaks(X,Y); evaluates peaks at
the given X and Y (which must
be the same size) and returns a matrix the same size.
peaks(...) (with no output
argument) plots the peaks function with surf.
Use any of the input argument combinations in the previous syntaxes.
[X,Y,Z] = peaks(...);
returns two additional matrices, X and Y,
for parametric plots, for example, surf(X,Y,Z,del2(Z)).
If not given as input, the underlying matrices X and Y are
[X,Y] = meshgrid(V,V)
where V is a given vector, or V is
a vector of length n with elements equally spaced
from -3 to 3. If no input argument is given, the default n is
49.
Examples
Peaks Surface
Create a 5-by-5 matrix of peaks and display the surface.
figure peaks(5);
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)
