Re-Dim (*solved*)

Boriel, can I use Dim in a SUB to reinitialise a global array?

DIM grid (3,3) as uByte

SUB reinitialiseGrid ()
DIM grid (3,3) as uByte => { {0,1,2,3}, {4,5,6,7}, {8,9,10,11}, {12,13,14,15} }
END SUB

Is that legal, or is it trying to make a local variable?

Experimenting says it's a local copy

Must be some way to reinitialise this. Is that a use for "byref" ?

[boriel]

Passing arrays in a parameter is not supported (yet).
The best way to do this is:

  Code:

DIM MyArray As ... => ...
...
...
MyOtherArray = MyArray 'Copies MyArray into MyOtherArray


Is that what you meant?

That will work. Didn't realise it was that simple to make a copy of the array - can make a working copy, and recopy over whenever we want to start again. (I was thinking I might have to do something manual with memcopy @address...)

Very nice, Boriel. ZX Basic never ceases to amaze me as to how powerful it is - and you keep adding more!

  Code:

DIM grid (4) as uByte => {0,1,2,3,4}
gridcopy=grid


Cannot assign an array to an escalar variable

Hmm.

Okay. If I dim gridcopy first, that bit works - but

1> It fails to copy the data. the first print out of gridcopy still shows 0,0,0,0
2> It fails to compile at the second copy, when I try to reinitialise it again: 40: Array 'grid' has 1 dimensions, not 0

  Code:

DIM grid (4) as uByte => {0,1,2,3,4}
DIM gridcopy(4) as uByte

gridcopy=grid

ink 1
for n=0 to 4
print grid (n);" ";
next n

print
print

ink 2
for n=0 to 4
print gridcopy (n);" ";
next n

print
print

gridcopy(0)=10
gridcopy(1)=20
gridcopy(2)=30
gridcopy(3)=40

ink 1
for n=0 to 4
print grid (n);" ";
next n

print
print

ink 2
for n=0 to 4
print gridcopy (n);" ";
next n
 
gridcopy=grid

print
print

ink 1
for n=0 to 4
print grid (n);" ";
next n

print
print

ink 2
for n=0 to 4
print gridcopy (n);" ";
next n

 

[boriel]

This is probably a bug (not a very tested feature, I guess).
Will check it, and see...

[boriel]

Ack: this is a bug. Fixing...

Update: I think It's now fixed.
Can you check it? (download 1.2.8 s785 or newer)

I don't think so.

1.2.9-s798

grid = 0,1,2,3,4

gridcopy = grid

print gridcopy gives 0,0,0,0,0

So no, data still isn't being copied from one array to the other.

[boriel]

Ok. Try now, downloading 1.2.9s801. I've fixed more cases (complete test coverage).

The above quoted code now does indeed show the array being copied correctly, changed correctly, and then recopied over correctly.

Awesome. Thanks!