How do i plot a graph between 3 variables?graph for x y and z

data=xlsread('a.xlsx'); X=data(:,6); Y=data(:,5);

for i=2:37 Z=(Y(i,1)-Y(i-1,1))/X(i,1);

end

Answer 1

[Ameer Hamza]

You need to index the variable Z,

Z = zeros(size(X));
for i=2:37 
  Z(i)=(Y(i,1)-Y(i-1,1))/X(i,1);
endl
plot3(X,Y,Z);

[Anna Gerald]

Thanks. It worked! How can i generate surface from these variables?

[Ameer Hamza]

For surface plot you will need a 2D grid of X and Y values i.e. 2D matrices. Right now your X and Y values are a one-dimensional vector. See mesh() and surf() for more details.

[Anna Gerald]

Can i build a surface by importing 3 variables from excel sheet?

[Ameer Hamza]

It depends on the values of 3 variables, If they are in the form of the grid then you can plot a surface. Can you attach the file so that I can make a proper suggestion?

[Anna Gerald]