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Answer 1

+3 A:

<?php
function increase($n) {
     return is_array($n) ? array_map('increase', $n) : $n * 2;
}

$new_beta = array_map("increase", $beta);

As for constructing the array, there are other methods to do so but I believe this is the most performent and clean.

MitMaro 2009-11-16 12:16:20

Will read about array_map and I will try you code snippet, first time hearing about array_map, thanks for the info.

Newb 2009-11-16 15:33:10

you is suppose to be "your," sorry damn QWERTY.

Newb 2009-11-16 15:33:57

Answer 2

+1 A:

Here is an answer for each question in that section of the book, enjoy!

<?php

// Declare an array alpha of 10 rows and 20 columns of type int
// Initialise the array alpha to 0
$alpha = array(array());
for($i = 0; $i < 10; $i++)
{
    for($j = 0; $j < 20; $j++)
    {
        $alpha[$i][$j] = 0;
    }
}

// Store 1 in the first row and 2 in the remaining rows
for($i = 0; $i < 10; $i++)
{
    for($j = 0; $j < 20; $j++)
    {
        if($i == 0)
        {
            $alpha[$i][$j] = 1;
        }
        else
        {
            $alpha[$i][$j] = 2;
        }
    }
}

// Store 5 in the first column, and make sure that the value in
// each subsequent column is twice the value in the previous column
// (Beware this doesn't build off the initial value of 5 in the first
// column but the previously set values above)
for($i = 0; $i < 10; $i++)
{
    for($j = 0; $j < 20; $j++)
    {
        if($j == 0)
        {
            $alpha[$i][$j] = 5;
        }
        else
        {
            if($j - 1 >= 1)
            {
                $alpha[$i][$j] = $alpha[$i][$j-1] * 2;
            }
        }
    }
}

// Print the array alpha one row per line
print "Printing the array alpha one row per line:<br/>";
for($i = 0; $i < 10; $i++)
{
    for($j = 0; $j < 20; $j++)
    {
        print "[". $alpha[$i][$j] ."] ";
    }

    print "<br/>";
}

print "<br/>";

// Print the array alpha one column per line
print "Printing the array alpha one column per line:<br/>";
for($j = 0; $j < 20; $j++)
{
    for($i = 0; $i < 10; $i++)
    {
        print "[". $alpha[$i][$j] ."] ";
    }

    print "<br/>";
}

?>

Ambrosia 2009-11-16 12:53:58

Thank you for the comments, Ambrosia.

Newb 2009-11-16 15:31:08

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