MATLAB: How to plot a matrix on a 3D graph

3d plotmatrix

Hi,
I have a 6×6 matrix that I need to plot on an 3D graph. The elements 1-2-3-4-5 of the first column should be on the x axis, the elements 1-2-3-4-5 of the first row should be on the y axis, element 0,0 is NaN.
The remaining 5×5 array contains the values for the z axis.
Can somebody please help me how to plot it.
Thanks.

Best Answer

[xx yy] = meshgrid(M(1,2:end),M(2:end,1));
plot3(xx(:),yy(:),reshape(M(2:end,2:end),[],1));
or surf or mesh whatever type of plot you want.
Addendum The best way to learn is to do it yourself and break down every line to see what's happening.
%Sample script to identify every op.
M = magic(6)
[xx yy] = meshgrid(M(1,2:end),M(2:end,1))
disp('M(2:end,2:end) = ');
M(2:end,2:end)
disp('M reshaped to column vector: ')
reshape(M(2:end,2:end),[],1)
M =
    35     1     6    26    19    24
     3    32     7    21    23    25
    31     9     2    22    27    20
     8    28    33    17    10    15
    30     5    34    12    14    16
     4    36    29    13    18    11
xx =
     1     6    26    19    24
     1     6    26    19    24
     1     6    26    19    24
     1     6    26    19    24
     1     6    26    19    24
yy =
     3     3     3     3     3
    31    31    31    31    31
     8     8     8     8     8
    30    30    30    30    30
     4     4     4     4     4
M(2:end,2:end) =
ans =
    32     7    21    23    25
     9     2    22    27    20
    28    33    17    10    15
     5    34    12    14    16
    36    29    13    18    11
M reshaped to column vector:
ans =
    32
     9
    28
     5
    36
     7
     2
    33
    34
    29
    21
    22
    17
    12
    13
    23
    27
    10
    14
    18
    25
    20
    15
    16
    11
The xx(:) operation does the same thing as reshape in this use of reshape.
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