Here is my achievement
X = xlsread('testEffx.xlsx','x');
Y = xlsread('testEffx.xlsx','y');
Z = xlsread('testEffx.xlsx','z');
%%
[zm,im] = max(Z,[],2); % find max in each row (columns direction)
ix = sub2ind(size(Z),1:length(im),im'); % convert to index
surf(X,Y,Z)
hold on
plot3(X(im),Y,Z(ix),'.y')
hold off
axis vis3d
