Error on plotting (Index in position 1 exceeds array bounds. Index must not exceed 51.)

I want to plot T_n on 3D graph but don't know how. Please help

[VBBV]

Can you put in code block instead of photosnapshot ?

Answer 1

[KSSV]

Simply try:

surf(T_n)

[Walter Roberson]

My reading of the code in the image is that T_n has one too many rows and columns compared to the X and Y grids of coordinates. But that would have been a lot easier to prove if only the actual code had been given, instead of an image of the code...

Answer 2

[Walter Roberson]

You use [X,Y] = meshgrid(1:1:n+1, 1:1:m+1) . When you do that, the values in X are 1 through n+1 and the values in Y are 1 through m+1 . You use those values in the surf() call to index T_n(X,Y) . So we need to know: does T_n have at least n+1 rows, and at least m+1 columns ?

Look back at how T_n is assigned to. You assign to T_n(m,n) right near the end of the loop. That implies that T_n has at least m rows and n columns. But notice that those are reversed from your meshgrid construction: your meshgrid is creating a first index based upon n, and a second index based upon m, but your T_n(m,n) is using a first index based upon m and a second index based upon n.

Notice that in the surf() call, you are using a variable named X as the first index of T_n . That would tend to imply that you believe that X corresponds to rows of an array. But that is not the case: in MATLAB, X corresponds to columns (X is horizontal direction, column number is horizontal direction) and Y corresponds to rows (Y is vertical direction, row number is vertical direction.)

If you do need to index in the surf() call, you should perhaps be using T_n(Y,X) . But more likely you should use T_n(1:m, 1:n)