Bon soir Etienne,
Like I say, "Inverting" an array is a chore, it's far easier to invert the pointers...
but if you must do it:-
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For loop to control the first dimension using $i
For loop to control the second dimension using $j
$temp = $array[ $i ][ $j ];
$array[ $i ][ $j ] = $array[ $j ][ $i ];
$array[ $j ][ $i ] = $temp;
Ok?
=dn
> thx a lot for your answer,
>
> in fact i only have to return one of the 15 datas, so it makes one column...
> anyway, i already coded a solution with a while. My question was just to
> know if it was possible to do it without repeating 1000000 times the same
> processing.
>
> In fact i begin to believe that it is not possible to reverse the 2
> dimensions of an array...
>
> If you have a solution for me i m interested, even if it takes a lot of
> processor ressources because i will have a dedicated server and there wont
> be more than 30 users, not at the same time (that s for a stat intranet)...
> just to correct my unprecision again, there will be 1M datas to process not
> 15 because the array i ve to process is the result of my mysql query and
> that this query will only return a single column of datas (count(*) )
>
> Helllpppp :)
>
> Etienne
>
>
> ----- Original Message -----
> From: "DL Neil" <[EMAIL PROTECTED]>
> To: "Etienne Durand" <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Thursday, January 31, 2002 10:44 AM
> Subject: Re: [PHP-DB] how to reverse a hudge multidimensional array?
>
>
> > Etienne,
> >
> > > Well i hope someone will be able to give me a solution...
> > > Here s my problem:
> > > I'm working with a hudge mysql table (about 15 columns and 1000000
> rows...)
> > >
> > > in fact i ve got to count the number of couples `ncompte`/`naffaire` in
> the
> > > table and finaly calculate the number of couples that appear once,
> twice....
> > >
> > > here is the query i do:
> > > $result = mysql_query("SELECT count(*) FROM datas GROUP BY `ncompte`,
> > > `naffaire`");
> > >
> > > its result like something like this:
> > > count(*) naffaire ncompte
> > > 4 affaire1 compte1
> > > 4 affaire2 compte2
> > > 1 affaire3 compte3
> > > 2 affaire4 compte4
> > > 1 affaire5 compte5
> > >
> > > (plus many more)
> > >
> > >
> > > my final result should be:
> > > $result[1] : 2
> > > $result[2] : 1
> > > $result[4] : 2
> > >
> > > I manage to do this quite easily but i use a while instruction...
> > >
> > > while($row = mysql_fetch_array($result)) {
> > > array_push($suite, $row["count(*)"]);
> > > }
> > >
> > > As my table is very long the while takes a lot of time to complete...
> > > So my question is : Is there a solution to return my array as follow :
> > >
> > > 1 2 3 1 4 7
> > > 4 5 6 ===>> 2 5 8 ???
> > > 7 8 9 3 6 9
> > >
> > > It would allow me to not have to use this long long while....
> > > So if someone could telle me how to modify my query or what instructions
> to
> > > use to do that...
> >
> >
> > =there are various functions in PHP to 'reverse' arrays, but I must
> confess that I have never used them.
> > Regardless, if there is one to suit your purpose, it will surely consume
> CPU time to achieve the swap-over of
> > 15M items.
> >
> > =your example "my final result should be:" talks of enumerated arrays, so
> I shall assume this is the way you
> > always use them.
> >
> > =you want to somehow achieve:
> > array[1][1] = array [1][1];
> > array[1][2] = array [2][1];
> > array[1][3] = array [3][1];
> > etc
> > (you know that you can't do the above, right!?)
> >
> > =thereafter the array would be processed by using a mechanism such as two
> nested FOR loops to iterate through
> > the row/column elements of the array, eg
> >
> > for ( i=1; i<15; i++ );
> > for ( j=1; j<1000000; j++ );
> > process( array[i][j] );
> > etc
> >
> > =can you leave the array where it is, and adjust the way the iterations
> are managed? Instead of proceeding
> > methodically by counting 'up', count 'down', eg
> >
> > for ( i=15; i>0; i-- );
> > for ( j=1000000; j>0; j-- );
> > process( array[i][j] );
> > etc
> >
> > =Regards,
> > =dn
> >
> >
> >
>
>
>
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