Adding arrays

[dennis.sprengers]

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );
}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

[Daz]

On May 7, 4:05 pm, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

Is there any guarantee that the arrays will all be the same length as
one-another? Are they always a set length, or can the lengths vary?

Personally, I would start with making an empty array, which is the
same length as the size of the longest array. Set all values in that
array to 0. Then, loop through each array, and loop through the values
of each array, and add them to the starting array. Now return the
array you just created. Hope that makes sense. Example to follow.

[Daz]

On May 7, 4:05 pm, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

I take that back, I misread your post. Sorry.

Example to follow anyway. :D

[ZeldorBlat]

On May 7, 11:05 am, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

Here's one way. Obviously there are others, also.

function add_arrays_cumu lative($arr) {
$out = array();

for($i = 0; $i < count($arr); $i++) {
if(!isset($out[$i]))
$out[$i] = array();

for($j = 0; $j < count($arr[$i]); $j++)
$out[$i][$j] = $arr[$i][$j] + (isset($out[$i-1][$j]) ?
$out[$i-1][$j] : 0);
}

return $out;
}

[dennis.sprengers]

The length of the array's may vary, as may the number of array's. But
all array's will be of equal length, i.e.

$arr = array(
array(3, 5, 7, 9, 23, 53, 54, 57),
array(2, 4, 6, 8, 23 , 2, 43, 5),
array(1, 3, 5, 7, 56, 45, 8, 54),
array(4, 4, 5, 3, 21, 3, 23, 42),
array(6, 3, 2, 1, 8, 33, 12, 43)
);

is also possible but

$arr = array(
array(3, 5, 7, 9, 23, 53, 54, 57),
array(2, 4, 6, 8, 23 , 2),
);

will never be :-) Hope this helps!

[dennis.sprengers]

Wow, thanks! It works great. I will spend the next hour or so trying
to understand what code you wrote and why I still can't come up with
stuff solutions that :-)

On 7 mei, 17:32, ZeldorBlat <zeldorb...@gma il.comwrote:

On May 7, 11:05 am, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

Here's one way. Obviously there are others, also.

function add_arrays_cumu lative($arr) {
$out = array();

for($i = 0; $i < count($arr); $i++) {
if(!isset($out[$i]))
$out[$i] = array();

for($j = 0; $j < count($arr[$i]); $j++)
$out[$i][$j] = $arr[$i][$j] + (isset($out[$i-1][$j]) ?
$out[$i-1][$j] : 0);
}

return $out;

}

[Daz]

On May 7, 4:40 pm, dennis.spreng.. [e-mail] wrote:

Wow, thanks! It works great. I will spend the next hour or so trying
to understand what code you wrote and why I still can't come up with
stuff solutions that :-)

On 7 mei, 17:32, ZeldorBlat <zeldorb...@gma il.comwrote:

On May 7, 11:05 am, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

Here's one way. Obviously there are others, also.

function add_arrays_cumu lative($arr) {
$out = array();

for($i = 0; $i < count($arr); $i++) {
if(!isset($out[$i]))
$out[$i] = array();

for($j = 0; $j < count($arr[$i]); $j++)
$out[$i][$j] = $arr[$i][$j] + (isset($out[$i-1][$j]) ?
$out[$i-1][$j] : 0);
}

return $out;

}

Here's my version with comments. I posted it anyway, as it would have
been a waste of time for me not to. I think it's identical to the
example above, but it's a little longer...

<?php

$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($inp ut_array) {

// Cteate a new tmp_array in the global scope
// of the function.
$tmp_array;

// Create out array which will be returned
$out_array = array();

// Add the first row of $arr
$out_array[] = $input_array[0];

// For each array from the second array in $arr...
//echo "<pre>",print_r ($input_array[0]),"</pre>";
for ($row = 1; $row < sizeof($input_a rray); $row++) {

// Create a new array
$tmp_array = array();

// Now, for each key in the current $arr row...
for ($key_num = 0; $key_num < sizeof($input_a rray[$row]); $key_num+
+) {

// Add the values of $input_array[$row-1][$key_num] to the values
// of the array in $output_array before ($out_array[$row]
[$key_num])
$tmp_array[$key_num] = $input_array[$row][$key_num] +
$out_array[$row-1][$key_num];
}
// Append the $tmp_array to the $output_array
$out_array[] = $tmp_array;
}
return $out_array;

}

$result= add_arrays($arr );
echo 'Contents of $result: <br />';
echo "<pre>Array 1:<br />",print_r($res ult[0]),"</pre>";
echo "<pre>Array 2:<br />",print_r($res ult[1]),"</pre>";
echo "<pre>Array 3:<br />",print_r($res ult[2]),"</pre>";
?>

[Daz]

On May 7, 4:40 pm, dennis.spreng.. [e-mail] wrote:

Wow, thanks! It works great. I will spend the next hour or so trying
to understand what code you wrote and why I still can't come up with
stuff solutions that :-)

On 7 mei, 17:32, ZeldorBlat <zeldorb...@gma il.comwrote:

On May 7, 11:05 am, dennis.spreng.. [e-mail] wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );

}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

Here's one way. Obviously there are others, also.

function add_arrays_cumu lative($arr) {
$out = array();

for($i = 0; $i < count($arr); $i++) {
if(!isset($out[$i]))
$out[$i] = array();

for($j = 0; $j < count($arr[$i]); $j++)
$out[$i][$j] = $arr[$i][$j] + (isset($out[$i-1][$j]) ?
$out[$i-1][$j] : 0);
}

return $out;

}

Oh, and for the record, ZeldorBlat's example is much safer. My example
was primarily to help you understand one of the possible methods to
achieve what you wanted. I didn't want you to just copy it and use it
as it was. Hopefully my version will have helped you understand the
steps taken to achieve the results you wanted. If you require a better
explanation of anything (in ZeldorBlat's example, or my own), please
don't hesitate to ask.

[dennis.sprengers]

@Daz - thanks! I will really help me understand. I will get back to
you if I'd have any questions :-)

[gosha bine]

de************* *@gmail.com wrote:

Consider the following multi-dimensional array:
---------------------------
$arr = array(
array(3, 5, 7, 9),
array(2, 4, 6, 8),
array(1, 3, 5, 7)
);

function add_arrays($arr ) {
for ($row = 0; $row < count($arr[0]); $row++) {
for ($column = 0; $column < count($arr[$column]); $column++) {
$totals[$row] = $totals[$row] + $arr[$column][$row];
}
}
print_r($totals );
}

add_arrays($arr );
---------------------------
This returns the following array:
Array ( [0] =6 [1] =12 [2] =18 [3] =24 )

These are the totals of the array's in $arr: 6 (3 + 2 + 1, added all
first elements), 12 (5 + 4 + 3, added all second elements), etc. This
took me quite a portion of the day to construct ;) However, I would
like add_arrays to return a multidimensiona l array like this:

Array (
Array ( [0] =3 [1] = 5 [2] = 7 [3] = 9 ) // 1st row
Array ( [0] =5 [1] = 9 [2] =13 [3] =17 ) // 1st row + second
row (i.e. 5 = 3 + 2)
Array ( [0] =6 [1] =12 [2] =18 [3] =24 ) // 1st _ 2nd + 3rd
row (i.e. 6 = 3 + 2 + 1)
)

Could somebody please help me building a function that does just that?
Adding one row to the previous one and adding the result to the output
array? Any help would be greatly apprectiated!

hi, how about

function plus($a, $b) { return $a + $b; }

$res = array(array_shi ft($arr));
foreach($arr as $row)
$res[] = array_map('plus ', end($res), $row);
simple, huh? ;))

--
gosha bine

extended php parser ~ http://code.google.com/p/pihipi
blok ~ http://www.tagarga.com/blok