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Full Discussion: Multiply elements of 2 arrays together into another array
Top Forums UNIX for Beginners Questions & Answers Multiply elements of 2 arrays together into another array Post 303034202 by sarapham409 on Sunday 21st of April 2019 07:51:39 PM
Old 04-21-2019
Multiply elements of 2 arrays together into another array
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 computation.

What I have done so far is loading the input file X.txt and Y.txt into array X & Y. I try to compute the multiplication and insert it into array Z but I keep getting a syntax error. This complicates me from moving on to compute the square root of the elements in Z.

Code:
#!/bin/bash

oldIFS="$IFS"
IFS=$'\n' X=($(<X.txt))
IFS="$oldIFS"

for each in "${X[@]}"
do
	echo "$each"
done

count=${#X[@]}

oldIFS="$IFS"
IFS=$'\n' Y=($(<Y.txt))
IFS="$oldIFS"

for each in "${Y[@]}"
do
	echo "$each"
done


for ((i=0;i<count;i++));do
	Z[$i]=$("${X[$i]} * ${Y[$i]}")
done

for each in "${Z[@]}"
do
	echo "$each"
done

 

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LEARN ABOUT PHP

array_intersect

ARRAY_INTERSECT(3)							 1							ARRAY_INTERSECT(3)

array_intersect - Computes the intersection of arrays

SYNOPSIS

       array array_intersect (array  $array1, array  $array2, [array  $...])

DESCRIPTION

       array_intersect(3)  returns  an	array  containing all the values of $array1 that are present in all the arguments. Note that keys are pre-
       served.

PARAMETERS

	      o $array1
		- The array with master values to check.

	      o $array2
		- An array to compare values against.

	      o $...
		- A variable list of arrays to compare.

RETURN VALUES

	Returns an array containing all of the values in $array1 whose values exist in all of the parameters.

EXAMPLES

       Example #1

	      array_intersect(3) example

	      <?php
	      $array1 = array("a" => "green", "red", "blue");
	      $array2 = array("b" => "green", "yellow", "red");
	      $result = array_intersect($array1, $array2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [a] => green
		  [0] => red
	      )

NOTES

       Note

	       Two elements are considered equal if and only if (string) $elem1 === (string) $elem2. In words: when the string	representation	is
	      the same.

SEE ALSO

       array_intersect_assoc(3), array_diff(3), array_diff_assoc(3).

PHP Documentation Group 													ARRAY_INTERSECT(3)
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