Array of Arrays

I know that I can create an array of arrays because of Wave's fantastic tutorial, thus:

MyArray[][] = [  [1,2,3,4],[5,6,7],[8,9,0] ]

and that I would access the relevant sub-array as:

MyArray[ArrayNumber][Position]

Ok, I would like to use this facility to hold integer path positions, and so the array will be created/re-initialised in my level_init() routine. I would normally re-dimension an array using:

MyArray = MyArray[..NEWSIZE]

so my questions are as follows:

1. if I re-dimension the big array holding all the sub arrays will it clear out/free up/garbage collect all previously dimensioned sub-arrays and any data that they hold (which is what I want to happen)? If so, what is the syntax for doing that?

2. Can I declare the big holding array without knowing the size of the sub-arrays, and then re-dimension the sub-arrays as I need them? Again, what would be the required syntax?

To make it clearer, the workflow would be something like this:

'pseudo code

open level data file
Read in WAVE_COUNT

re-dimension MyArray to be WAVE_COUNT-1 arrays of sub_arrays

for x=0 to WAVE_COUNT-1
     re-dimension sub_array[x] to newsize
     read path data into sub_array[x]
next

I hope that this makes sense! :-)

yucky problem, does this help:

Local a[][]=[New Int[2],New Int[3],New Int[7]]

' cull last entry from each dimension

Local b[]

For i=0 Until a.length
	b=a[i]
	If b b=b[..b.length-1]
	a[i]=b
Next

' and test

For b=EachIn a
	Print b.length
Next