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Help In understanding Multi Dimentional Arrays


Help In understanding Multi Dimentional Arrays

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

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

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

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

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

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(...)
                   )
     )
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