not strictly increasing error with 3D plot about owl

[mars0i]

That's it--I didn't notice that z had to be rotated relative to x and y. Thanks!

[ryanrhymes]

@mars0i I think the reason is the shape of these matrices don't match. The z should have shape 9 x 8 instead of 8 x 9. So if you use meshgrid to create these two matrices x and y, then you can write

let x, y = Mat.meshgrid 0. 8. 0. 7. 9 8;;

   C0 C1 C2 C3 C4 C5 C6 C7 C8                                                                                                                                                        R0  0  1  2  3  4  5  6  7  8                                                                                                                                                        
R1  0  1  2  3  4  5  6  7  8
R2  0  1  2  3  4  5  6  7  8
R3  0  1  2  3  4  5  6  7  8
R4  0  1  2  3  4  5  6  7  8
R5  0  1  2  3  4  5  6  7  8
R6  0  1  2  3  4  5  6  7  8
R7  0  1  2  3  4  5  6  7  8


   C0 C1 C2 C3 C4 C5 C6 C7 C8
R0  0  0  0  0  0  0  0  0  0
R1  1  1  1  1  1  1  1  1  1
R2  2  2  2  2  2  2  2  2  2
R3  3  3  3  3  3  3  3  3  3
R4  4  4  4  4  4  4  4  4  4
R5  5  5  5  5  5  5  5  5  5
R6  6  6  6  6  6  6  6  6  6
R7  7  7  7  7  7  7  7  7  7

(* then z should be 9 x 8 *)
let z = Mat.uniform 9 8;;

         C0       C1       C2       C3        C4       C5       C6       C7                                                                                                          R0 0.222671 0.434721 0.650298 0.518921  0.881284 0.802989  0.91419 0.493246                                                                                                          
R1 0.816488 0.249789  0.23474 0.653041  0.903702 0.776013 0.528878 0.786525
R2 0.881226 0.311529 0.215572 0.138114  0.800453 0.869957 0.356799 0.739012
R3 0.285757 0.575163 0.453706 0.856444  0.848671 0.267722 0.811779 0.436114
R4 0.670338  0.27585 0.271778 0.730103  0.485819 0.965297 0.415441 0.329227
R5 0.833202 0.493767 0.874061 0.965179  0.806662 0.191208 0.541577 0.468292
R6 0.457119 0.457139  0.27113 0.136853  0.534103 0.973245   0.8913 0.969978
R7 0.527856 0.856772 0.712637 0.134343 0.0414307  0.51925 0.190386 0.615259
R8  0.79921 0.171861 0.863142 0.279621  0.981742  0.57437 0.638904 0.681927

Plot.plot3d x y z;;