Help In understanding Multi Dimentional Arrays

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By : user3865267

Date : January 10 2021, 01:57 PM

like below fixes the issue You can see your three dimensional array as 3 bidimensional array of 4x5 elements, or 12 one dimensional array of 5 elements.
That's why you have 12 rows in your output.

code :

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Casting between multi- and single-dimentional arrays

By : Joris Witteman

Date : March 29 2020, 07:55 AM

To fix this issue This came up from this answer to a previous question of mine. Is it guaranteed for the compiler to treat array[4][4] the same as array[16]? , From the C++ standard, referring to the sizeof operator:

code :

sizeof(double[4]) = 4*sizeof(double)

sizeof(double[4][4]) = 4*sizeof(double[4])

sizeof(double[4][4]) = 4*4*sizeof(double) = 16*sizeof(double) = sizeof(double[16])

Changing values of multi dimentional arrays

By : user3594552

Date : March 29 2020, 07:55 AM

I wish did fix the issue. I have the results of a mysql query in a multi dimentional array as follows: , What have you tried? Something like this should work.

code :

foreach ($result as $i => $item)
{
    if ($item->userlevel == 5)
        $result[$i]->name = 'modified name';
}

ClassCastException on Multi-Dimentional Arrays in Java

By : user3006235

Date : March 29 2020, 07:55 AM

will be helpful for those in need You shouldn't be casting. Pass an Integer[][] to toArray. Something like

code :

Integer[][] toArray = mdArrayList.toArray(new Integer[][] {});
System.out.println(Arrays.deepToString(toArray));

[[1, 2], [3, 4], [5, 6], [7, 8]]

Sum and Average in multi-dimentional arrays with php

By : user3793295

Date : March 29 2020, 07:55 AM

fixed the issue. Will look into that further I'm trying to get sum and average of visitors from the following multi-dimensional array : , Use this

code :

<?php

$mainarray = array('visitors' => Array(
        '2015-06-12' => Array(Array('value' => 29)),
        '2015-06-11' => Array(Array('value' => 55))));
$sum = 0;
$count = 0;

$visitor =  $mainarray['visitors'];
foreach ($visitor as $key => $val) {
    $sum += $val[0]['value'];
    $count++;
}
echo "Sum is " . $sum."<br>";
$average = ($sum / $count);
echo "Average is " .$average."<br>";;
?>

How to create multi-dimentional arrays in R

By : Håkon Eide

Date : March 29 2020, 07:55 AM

like below fixes the issue R's arrays follow more the mathematical array object of generalized N-dimensional structure (with matrix as a special array of 2-D structure) where all elements maintain same types, similar to Python numpy array or Matlab array.
Your suggested object is more akin to PHP, Perl, or Ruby multidimensional arrays (or Python lists/dictionary) which are really hash tables under the hood, and the best counterpart in R will be a named list such as below. Here you can nest lists with named objects all containing different types (character, numeric, logical, etc.). Do note: booleans in R are ALL CAPS.

code :

list(game_no = list(winner = TRUE,
                    state_no = list(state = list("x", "y", ...))
                    state_no = list(...)
                   )
     )