If-then-else statements.

The following gives a mesh plot if the user enters the string 'm':

x=input(' Do you want a contour (c) or a mesh plot (m)');
if( x == 'm')  
   mesh(xx,yy,zz) 
else 
   contour(xx,yy,zz,20) 
end

Nested if-statements.

The following gives a `double' step function, i.e. a function that jumps at x=0 and again at x=1:

function [y] = twostep(x)
if x <= 0
   y=0;
else
   if x <= 1
      y = 1;
   else
      y = 2;
   end
end

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