clear all
clc
D=dlmread('book2.csv',',')';
x=D(1,:);y=D(2,:);z=D(3,:);
X=[x(1:5:30);x(2:5:30);x(3:5:30);x(4:5:30);x(5:5:30)];
Y=[y(1:5:30);y(2:5:30);y(3:5:30);y(4:5:30);y(5:5:30)];
Z=[z(1:5:30);z(2:5:30);z(3:5:30);z(4:5:30);z(5:5:30)];
surf(X,Y,Z)