Multiplying from two array variable in PHP

Question

Let say.. I have data like this

wij = [0.5, 0.30, 0.25, 0.15, 0.25]

and

enter image description here

As you see.. each data in wij is represent from C1 until C5 from table above

C1=0.5, C2=0.30, C3=0.25, C4=0.15, C5=0.25

So.. i create the wij into array-variable like this:

$wij = array(0.5, 0.30, 0.25, 0.15, 0.25);

and A1 until A5 rows into array-variable:

$nij = array(
    array(150, 15, 2, 2, 3);
    array(500, 200, 2, 3, 2);
    array(200, 10, 3, 1, 3);
    array(350, 100, 3, 1, 2);
);

I want to multiplying each data from wij with data from A1 until A5 rows, so it will be look like this:

A1 = (0.5*150)+(0.30*15)+(0.25*2)+(0.15*2)+(0.25*3)

A2 = (0.5*500)+(0.30*200)+(0.25*2)+(0.15*3)+(0.25*2)

A3 = (0.5*200)+(0.30*10)+(0.25*3)+(0.15*1)+(0.25*3)

A4 = (0.5*350)+(0.30*100)+(0.25*3)+(0.15*1)+(0.25*2)

I don't have any clue how to do it using for-loops or foreach-loops. Because each rows in table is not always have 4 data like from table above, it can always 5 rows or more, so I guess it will be work if using for-loops.

ssorfonos · Accepted Answer · 2015-02-21 18:20:17Z

1

<?php 
$wij = array(0.5, 0.30, 0.25, 0.15, 0.25);
$array1 = array(150, 15, 2, 2, 3);
$array2 = array(500, 200, 2, 3, 2);
$array3 = array(200, 10, 3, 1, 3);
$array4 = array(350, 100, 3, 1, 2);
$arrays = array($array1,$array2,$array3,$array4);
$as = array(0,0,0,0);


for($i = 0;$i<4;$i++)
{
    for($t = 0;$t<5;$t++)
    {
    $as[$i] += ($wij[$t]*$arrays[$i][$t]);
    }
    echo "</br>".$as[$i];   
}

?>

I can explain for-loop, if you want.

answered Feb 21, 2015 at 18:20

ssorfonos

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2 Comments

pankijs Over a year ago

interesting style, I would write arrays in array, looks much cleaner than 5 variables insreted in array.

pankijs Over a year ago

also use foreach loops, better because array size may differ

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