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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