Two dimensional array initialization

[Dadi]

Hi,

I can make a simple initialization work like this:

Object[,] ONE_ROW = {{"Vodafone", "55501601001970 16"}};

But, now I want to create another array that consists of multiple copies of ONE_ROW like this (will not compile):

Object[,] TWO_ROWS = {ONE_ROW, ONE_ROW}; // Works in Java ;-)

This yields "Incorrectl y structured array initializer"!!

This, however, is a correct implementation using hard-coded data:

Object[,] TWO_ROWS = {{"Vodafone", "55501601001970 16"}, {"Vodafone", "55501601001970 16"}};

Any ideas?

Regards,
Dadi.

[Jon Skeet [C# MVP]]

Re: Two dimensional array initialization

Dadi <dadi@hugur.i s> wrote:[color=blue]
> I can make a simple initialization work like this:
>
> Object[,] ONE_ROW = {{"Vodafone", "55501601001970 16"}};
>
> But, now I want to create another array that consists of multiple copies
> of ONE_ROW like this (will not compile):[/color]

It sounds like you want jagged arrays then, rather than rectangular
arrays. If you do:

Object[][,] TWO_ROWS = {ONE_ROW, ONE_ROW}; I believe it'll work.

(Haven't tried it though...)

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Daniel Billingsley]

Re: Two dimensional array initialization

Actually Jon I think he wants

Object[][] TWO_ROWS =

a jagged array of ONE_ROW arrays. Your code would be a jagged array of 2D
rectangular arrays which I don't think was the intent, wouldn't it?

I've been wrong about arrays before so maybe I am again.

"Jon Skeet [C# MVP]" <skeet@pobox.co m> wrote in message
news:MPG.19ed1c 1f41a818b498981 9@msnews.micros oft.com...[color=blue]
> Dadi <dadi@hugur.i s> wrote:[color=green]
> > I can make a simple initialization work like this:
> >
> > Object[,] ONE_ROW = {{"Vodafone", "55501601001970 16"}};
> >
> > But, now I want to create another array that consists of multiple copies
> > of ONE_ROW like this (will not compile):[/color]
>
> It sounds like you want jagged arrays then, rather than rectangular
> arrays. If you do:
>
> Object[][,] TWO_ROWS = {ONE_ROW, ONE_ROW}; I believe it'll work.
>
> (Haven't tried it though...)
>
> --
> Jon Skeet - <skeet@pobox.co m>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too[/color]

[Jon Skeet [C# MVP]]

Re: Two dimensional array initialization

Daniel Billingsley <dbillingsley@N O.durcon.SPAAMM .com> wrote:[color=blue]
> Actually Jon I think he wants
>
> Object[][] TWO_ROWS =
>
> a jagged array of ONE_ROW arrays. Your code would be a jagged array of 2D
> rectangular arrays which I don't think was the intent, wouldn't it?[/color]

I don't know - the intent wasn't very clear! However, my code would
give a single array of 2D rectangular arrays.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Daniel Billingsley]

Re: Two dimensional array initialization

That's what I said, isn't it? :)

I meant your overall array [][,] would be jagged, as opposed to simply 3D
[,,].

Yes, no, maybe so? (Trying to see if I'm starting to grasp this terminology
as well as I think I am.)

"Jon Skeet [C# MVP]" <skeet@pobox.co m> wrote in message
news:MPG.19efa7 9e5318480a98984 3@msnews.micros oft.com...
[color=blue][color=green]
> > ... Your code would be a jagged array of 2D
> > rectangular arrays which I don't think was the intent, wouldn't it?[/color]
>
> I don't know - the intent wasn't very clear! However, my code would
> give a single array of 2D rectangular arrays.
>[/color]

[Jon Skeet [C# MVP]]

Re: Two dimensional array initialization

Daniel Billingsley <dbillingsley@N O.durcon.SPAAMM .com> wrote:[color=blue]
> That's what I said, isn't it? :)[/color]

Not quite - it's definitely *not* a jagged array *of* 2D rectangular
arrays, in the same way that int[] isn't a jagged array of ints, it's
just an array of ints, if you see what I mean.
[color=blue]
> I meant your overall array [][,] would be jagged, as opposed to simply 3D
> [,,].[/color]

I'm not sure whether I'd say the overall array is jagged or not - it's
certainly not rectangular, but it's not jagged in the normal sense
either.

Fortunately this is unlikely to actually be an issue very often :)

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Daniel Billingsley]

Re: Two dimensional array initialization

Hmm... I thought jagged simply meant an array of arrays... what did you mean
by the "normal sense" of jagged usage?

an array of ints is 1 dimensional, and not relevant to this discussion in my
mind.

an array of arrays, or an array of arrays of arrays, or an array of 2D
arrays, are all "jagged" I would think by definition, no?

[,] defines 2D array, definitely not jagged
[][] defines array of arrays, definitely jagged

[][,] defines an array of 2D arrays, jagged, right?
[][][] defines an array of arrays of arrays, jagged, right?
[,,] defines a 3D array, not jagged, right?

"Jon Skeet [C# MVP]" <skeet@pobox.co m> wrote in message
news:MPG.19efdf 018284f12f98984 4@msnews.micros oft.com...[color=blue]
> Daniel Billingsley <dbillingsley@N O.durcon.SPAAMM .com> wrote:[color=green]
> > That's what I said, isn't it? :)[/color]
>
> Not quite - it's definitely *not* a jagged array *of* 2D rectangular
> arrays, in the same way that int[] isn't a jagged array of ints, it's
> just an array of ints, if you see what I mean.
>[color=green]
> > I meant your overall array [][,] would be jagged, as opposed to simply[/color][/color]
3D[color=blue][color=green]
> > [,,].[/color]
>
> I'm not sure whether I'd say the overall array is jagged or not - it's
> certainly not rectangular, but it's not jagged in the normal sense
> either.
>
> Fortunately this is unlikely to actually be an issue very often :)
>
> --
> Jon Skeet - <skeet@pobox.co m>
> http://www.pobox.com/~skeet
> If replying to the group, please do not mail me too[/color]

[Jon Skeet [C# MVP]]

Re: Two dimensional array initialization

Daniel Billingsley <dbillingsley@N O.durcon.SPAAMM .com> wrote:[color=blue]
> Hmm... I thought jagged simply meant an array of arrays... what did you mean
> by the "normal sense" of jagged usage?[/color]

I'd say that a jagged array of "X"s is an array of arrays of "X"s.
[color=blue]
> an array of ints is 1 dimensional, and not relevant to this discussion in my
> mind.[/color]

Ah, but it is in mine. Here's a jagged array of ints:

int[][] x;

That means a jagged array *of* arrays is similarly:

Something[][][] x;

That's a jagged array of (Something[]).

Just

Something[][] x;

is a jagged array of (Something) instead.

In this case we have:

Something[][,];

which is a one-dimensional array of (Something[,]), rather than a
jagged array of Something[,]. It may or may not (see below) count as a
jagged array of Something. Semi-jagged perhaps?
[color=blue]
> an array of arrays, or an array of arrays of arrays, or an array of 2D
> arrays, are all "jagged" I would think by definition, no?[/color]

Not sure. Possibly, possibly not. My main point was that it wasn't a
jagged array of 2D arrays, but now we're getting into deeper water :)

I keep flip-flopping on whether or not I'd consider it jagged in
general. I think I probably would, on balance, contrary to my previous
post.

--
Jon Skeet - <skeet@pobox.co m>

http://www.pobox.com/~skeet

If replying to the group, please do not mail me too

[Daniel Billingsley]

Re: Two dimensional array initialization

I'm sure where you landed when you flip-flopped, so I don't know if we're
still disagreeing. :)

"Jon Skeet [C# MVP]" <skeet@pobox.co m> wrote in message
news:MPG.19f0d4 f1f86a491798985 8@msnews.micros oft.com...[color=blue]
> Daniel Billingsley <dbillingsley@N O.durcon.SPAAMM .com> wrote:[color=green]
> > Hmm... I thought jagged simply meant an array of arrays... what did you[/color][/color]
mean[color=blue][color=green]
> > by the "normal sense" of jagged usage?[/color]
>
> I'd say that a jagged array of "X"s is an array of arrays of "X"s.[/color]

Yes I agree. MS defines a jagged array as "an array whose elements are
arrays." But there is no specification of what that second "of arrays"
looks like - 1D, 2D, 3D doesn't change the definition.

[color=blue]
> Something[][,];
>
> which is a one-dimensional array of (Something[,]), rather than a
> jagged array of Something[,]. It may or may not (see below) count as a
> jagged array of Something. Semi-jagged perhaps?[/color]

Is Something[,] not an array? Then that makes Something[][,] an
array of arrays, and therefore jagged by definition, just as MS explains a
bit further down on that same doc page:

"It is possible to mix jagged and multidimensiona l arrays. The following is
a declaration and initialization of a single-dimensional jagged array that
contains two-dimensional array elements of different sizes:

int [] [,] myJaggedArray = new int [] [3,] { new int [,] " blah blah blah
[color=blue]
>
> Not sure. Possibly, possibly not. My main point was that it wasn't a
> jagged array of 2D arrays, but now we're getting into deeper water :)[/color]

Sure looks to me like MS just said [][,] is a jagged array of 2D arrays.

I'm sorry, I'm not trying to be a smart alec proving you wrong per se.. it's
just that I find myself completely confused and wrong enough that when I
think I've got something nailed for once I've got to cling to it
desperately. LOL.

[Daniel Billingsley]

Re: Two dimensional array initialization

I meant I'm *NOT* sure, of course. I've been typing like a retard all day.
Need coffee.

"Daniel Billingsley" <dbillingsley@N O.durcon.SPAAMM .com> wrote in message
news:usg1G01jDH A.1408@TK2MSFTN GP11.phx.gbl...[color=blue]
> I'm sure where you landed when you flip-flopped, so I don't know if we're
> still disagreeing. :)
>[/color]