The C programming language was not really designed with multi-dimensional arrays in mind. C sort of works with 2D arrays, but remember that they are either arrays of arrays or arrays of pointers to arrays. Get this wrong, and you will get lots of errors, or worse, segmentation faults.
3D arrays are a nightmare! Don't do it in C! Use a language better suited to multi-dimensional arrays, or an OO language with a tried-and-tested multi-dimensional array class. If you have to use C, don't use 3D arrays - emulate them instead!
Code:
typedef struct arr_str{
int *arr; /* pointer to array */
int xDim; /* size of X dimension */
int yDim; /* size of Y dimension */
int zDim; /* size of Z dimension */
} threeDeeArr, *threeDeeArrPtr;
int getIndex(threeDeeArrPtr array, int x, int y, int z)
{
int index;
index = x * array.xDim;
index = (index + y) * array.yDim;
return index + z;
}
int getFromIndex(threeDeeArrPtr array, int x, int y, int z)
{
return array->arr[getIndex(array, x, y, z)];
}
void putAtIndex(threeDeeArrPtr array, int x, int y, int z, int val)
{
array->arr[getIndex(array, x, y, z)] = val;
}
my calculations of a 3D array are probably off, you will have to test that I got it right. The above code does not include the initialisation or destruction "methods" required before you can actually use this struct in anger. Once the indexing is correctly calculated the above struct will be much easier to use in C than proper 3D arrays.
Hi,
I am trying to assign an array as a value to one of the array element, I mean
I have an array @KS and array @kr.
I want array @KS to hold @kr as an element.
So I am doin this
$KS=@kr;
But the value stored is number of elements in the @kr array.
Can... (2 Replies)
Suppose there are two arrays of arrays:
@A = ( , , , );
@B = ( , , , , );
For each of $A, $A, $A..., I want to find the corresponding one in @B (match the letter, like $A eq $B), and print out both the second item, for example, $A and $B.
How can I do this in perl? grep + map? Hope I... (1 Reply)
PHP question...I posted this on the Web Development forum, but maybe this is a better place!
I have an SQL query that's pulled back user IDs as a set of columns. Rather than IDs, I want to use their names.
So I have an array of columns $col with values 1,7,3,12 etc and I've got an array $person... (3 Replies)
Hi All
I need to get <STDIN> from a user. the <STDIN> is a range of number delimited by "," (comma) and can be with range delimited by "-".
Example: 1,2,3,4-9,12,15,34-36,70
Now I need to get this from the user and go on each number and "Do something"... but when trying to do this as above... (2 Replies)
here is what i have...
i=1
while read line
do
if grep -i-q "create procedure"<<<$line
then
startline="$line"
endline="blahblah"
Get procedure name into a variable named procName
procName="procedure name is stored"
do some... (2 Replies)
hello,
i need a bit of help on how to do this effectively in bash without a lot of extra looping or massive switch/case
i have a long array of M elements and a short array of N elements, so M > N always. M is not a multiple of N.
for case 1, I want to stretch N to fit M
arrayHuge
H = (... (2 Replies)
I hate I'm asking for help again. Unfortunately it seems there just aren't any links I can find on making an array that holds a bunch of two dimensional arrays. Maybe my google-fu is lacking. Basically I have a header file like this:
#define MATRIX 10
int white_l1;
int white_l2;
int... (2 Replies)
Le sigh... Hopefully this will be the last time I have to ask for help on this topic. For a while now I've been working with a 1d array that holds 2d arrays. For reference you can view here. Now I'm just trying to loop through the elements with the following:
#include <stdio.h>
void... (3 Replies)
So I need to Write an array processing program using a Linux shell programming language to perform the following.
Load array X of 20 numbers from an input file X.
Load array Y of 20 numbers from an input file Y.
Compute array Z by multiply Xi * Yi then compute the square-root of this... (2 Replies)
Discussion started by: sarapham409
2 Replies
LEARN ABOUT PHP
collator_asort
COLLATOR_ASORT(3) 1 COLLATOR_ASORT(3)Collator::asort - Sort array maintaining index association
Object oriented style
SYNOPSIS
public bool Collator::asort (array &$arr, [int $sort_flag])
DESCRIPTION
Procedural style
bool collator_asort (Collator $coll, array &$arr, [int $sort_flag])
This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is
used mainly when sorting associative arrays where the actual element order is significant. Array elements will have sort order according to
current locale rules.
Equivalent to standard PHP asort(3).
PARAMETERS
o $coll
-Collator object.
o $arr
-Array of strings to sort.
o $sort_flag
- Optional sorting type, one of the following:
o Collator::SORT_REGULAR - compare items normally (don't change types)
o Collator::SORT_NUMERIC - compare items numerically
o Collator::SORT_STRING - compare items as strings
Default $sort_flag value is Collator::SORT_REGULAR. It is also used if an invalid $sort_flag value has been specified.
RETURN VALUES
Returns TRUE on success or FALSE on failure.
EXAMPLES
Example #1
collator_asort(3)example
<?php
$coll = collator_create( 'en_US' );
$arr = array(
'a' => '100',
'b' => '50',
'c' => '7'
);
collator_asort( $coll, $arr, Collator::SORT_NUMERIC );
var_export( $arr );
collator_asort( $coll, $arr, Collator::SORT_STRING );
var_export( $arr );
?>
The above example will output:
array (
'c' => '7',
'b' => '50',
'a' => '100',
)array (
'a' => '100',
'b' => '50',
'c' => '7',
)
SEE ALSO
Collator constants, collator_sort(3), collator_sort_with_sort_keys(3).
PHP Documentation Group COLLATOR_ASORT(3)