Matlab peaks 两个变量的样本函数-经管之家官网！

PEAKSA sample function of two variables.
PEAKS is a function of two variables, obtained by translating and
scaling Gaussian distributions, which is useful for demonstrating
MESH, SURF, PCOLOR, CONTOUR, etc.
There are several variants of the calling sequence:
Z = PEAKS;
Z = PEAKS(N);
Z = PEAKS(V);
Z = PEAKS(X,Y);
PEAKS;
PEAKS(N);
PEAKS(V);
PEAKS(X,Y);
[X,Y,Z] = PEAKS;
[X,Y,Z] = PEAKS(N);
[X,Y,Z] = PEAKS(V);
The first variant produces a 49-by-49 matrix.
The second variant produces an N-by-N matrix.
The third variant produces an N-by-N matrix where N = length(V).
The fourth variant evaluates the function at the given X and Y,
which must be the same size.The resulting Z is also that size.
The next four variants, with no output arguments, do a SURF
plot of the result.
The last three variants also produce two matrices, X and Y, for
use in commands such as PCOLOR(X,Y,Z) or 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.