Chapter 4: Programming in Matlab - College of the Redwoods

Section 4.1 Logical Arrays 295
Eliminate complex numbers from
the matrix z.
k=real(z)~=z;
z(k)=NaN;
Open a new figure window and
replot the surface.
figure
mesh(x,y,z)
35. Define the anonymous function.
f=@(x,y) 12-x-y;
Set up the grid.
x=linspace(-3,3,40);
y=x;
[x,y]=meshgrid(x,y);
Evaluate the function at each (x, y)
pair in the grid.
z=f(x,y);
Determine where x > −1 and
set all entries in z equal to NaN where
this contraint is not satisfied.
k=x>-1;
z(~k)=NaN;