plotting highest point in a filled contour

Hi can somebody help me with the Matlab command here. I've got to determine the highest point in a filled contour I've plotted using matrix data in a file. And then I have to mark the highest point with a red x.

load('0101862_mod.dtm')   % loading the dtm file
X = X0101862_mod(1:81,:)  % we name X0101862, it is the location where the data X, Y and Z is stored
Y = X0101862_mod(82:162,:)
Z = X0101862_mod (163:243,:)

figure (1)
subplot(2,2,3)
[C,h] = contourf(X,Y,Z,10);
xlabel('x'); ylabel('y'); zlabel('z'); title('X0101862_mod');
view(-73,34); axis equal; colormap summer; colorbar;

i know it involves max command. Kept getting error when i开发者_JAVA百科 use max.

To plot the red 'X', you have to call first hold on to make sure that the second plotting command won't erase the contour. Then, you use plot(xMax,yMax,'xr') to plot a red 'x' at the x/y coordinates where z is at its maximum.

To find xMax and yMax, you have to use the second output argument of max. MAX returns, as first output, the maximum (e.g. of Z), and as a second output, it returns the number of the element that is maximal. Use that number (the index) to find the elements in X and Y that correspond to the maximum Z-value, i.e. xMax and yMax.