[Gambas-user] Something i do not understand

[Tobias Boege]

On Mon, 08 Dec 2014, Fabien Bodard wrote:
>   Dim grad As Float[][][]
> 
> grad = New Float[][width, height]
> grad[x][y] = [0.2, 0.2]
> 
> give me a 'bad number of dimention error' .. why ????
> 

The syntax

  Float[][width, height]

does not exist in Gambas. Multi-dimensional arrays are only implemented
for native datatypes (Float, etc.), not for classes like Float[]. Even if
it was implemented, Float[][A, B] would still yield a 2-dimensional array
of Float[] objects whereas Float[][][] would be a 1-d array of Float[][]
objects. Those two things are different / incompatible.

If you want to use

  Dim grad As Float[][][]

you must do

  grad = New Float[][][](size1)  ' size1 so that x < size1
  grad[x] = New Float[][](size2) ' size2 so that y < size2
  grad[x][y] = [0.2, 0.2]

See attached script.

Regards,
Tobi

-- 
"There's an old saying: Don't change anything... ever!" -- Mr. Monk
-------------- next part --------------
#!/usr/bin/gbs3

Public Sub Main()
  Dim grad As Float[][][]
  Dim x, y As Integer

  x = 2
  y = 1

  ' Ensure that no "out of bounds" is raised
  grad = New Float[][][](x + 1)
  grad[x] = New Float[][](y + 1)
  grad[x][y] = [0.2, 0.2]
End