array multiplication

stackoverflow.com - 2012-06-20 21:39:16 - Similar - Report/Block

I'm trying to multiply two arrays without using numpy. But, I receive an error on the line "multi = a[i]*b[j]" stating that the index is out of range. a = [1,2,3] b = [4,5,6] multi = [0,0,0,0,0,0,0,0] for i in a: for j in b: multi = a[i]*b[j] append.multi(y) print multi...

I honestly have no clue how to formulate this pass-by-reference conundrum

stackoverflow.com - 2012-03-27 12:38:18 - Similar - Report/Block

So here's what I see this code doing: An array is made A loop iterates 10 times A new array is created A reference to this new array is saved in the first array 10 arrays now reside in the original array with values 0, 1, 2, 3... What really happens: Code: <?php header('Content-type: text/plain'); $arrays = array(); foreach(range(0, 10...

Javascript indexOf for an array of arrays not finding array

stackoverflow.com - 2012-04-21 17:11:00 - Similar - Report/Block

I have an array with nested arrays that looks like this: var tw = [[3, 0], [11, 0], [3, 14], [11, 14]]; When I try and find if the array contains a passed in array, I always get a result of -1. For example: var test = $.inArray([3, 0], tw); var test2 = tw.indexOf([3, 0]); both return -1, even though the first object in the array is [3,0]...

interview questions in javascript arrays

stackoverflow.com - 2012-07-04 16:22:46 - Similar - Report/Block

i need help in solving javascript questions Task 1: Find Arrays Implement a method that given two arrays as parameters will find the starting index where the second parameter occurs as a sub-array in the array given as the first parameter. E.g.: [4,9,3,7,8], [3,7] should return 2. Suggested effort: up to 20 minutes Task 2: Array conversion...

Sorting Arrays in Efficient way?

stackoverflow.com - 2013-04-23 11:45:12 - Similar - Report/Block

We have two arrays, size n and n+m. The first array has n elements and the second array has m elements. Merge the two arrays and store the result in the second array in a sorted manner and without using extra space ? Tried So Far ? Sorted both my arrays using quick sort and then merged using MergeSort...

Spliting/Slicing array in ruby

stackoverflow.com - 2013-02-22 11:55:05 - Similar - Report/Block

I've found this similar two questions to the one I'm about to ask : Split array up into n-groups of m size? and Need to split arrays to sub arrays of specified size in Ruby This splits array into three arrays with each array having three elements : a.each_slice(3) do |x,y,z| p [x,y,z] end So if I do this (my array size is 1000) : a.each_...

Numpy: How to elementwise-multiply two vectors, shape (n,1) and (n,)?

stackoverflow.com - 2012-03-30 19:53:01 - Similar - Report/Block

Elementwise multiplication of two vectors is no problem if they both have the same shape, say both (n,1) or both (n,). If one vector has shape (n,1) and the other (n,), though, the -operator returns something funny. a = np.ones((3,1)) b = np.ones((3,)) print a * b The resulting nxn-matrix contains A_{i,j}=a_i*b_j. How can I do elementwise...

append a numpy array to a numpy array

stackoverflow.com - 2012-03-19 18:55:24 - Similar - Report/Block

I just started programming in python and am very new to numpy packages.. so still trying to get a hang of it. I have a an numpy_array so something like [ a b c] And then I want to append it into anotehr numpyarray (Just like we create a list of lists) How do we create an array of numpy arrays containing numpy arrays I tried to do the fol...

New to arrays-Create two column array with different column order to sheet?

excelforum.com - 2013-05-02 06:03:17 - Similar - Report/Block

UPDATE: Yes, I know the obvious solution is to alter the worksheet column order instead. But I can't (long story) hence this thread. I am new to arrays and wish to achieve the following: I have worksheet range in Column A & Column B that I want to read into an array of 2 columns wide, X (variable) rows deep. Now for the catch. I need the...

Split a string to form multidimensional array keys?

stackoverflow.com - 2012-05-09 17:21:22 - Similar - Report/Block

I'm creating JSON encoded data from PHP arrays that can be two or three levels deep, that look something like this: [grandParent] => Array ( [parent] => Array ( [child] => myValue ) ) The method I have, which is simply to create the nested array manually in the code requires me to use my 'setOption' function (which handles...

Return a n-by-1 matrix from a multi-dimensional array

stackoverflow.com - 2012-03-30 14:55:16 - Similar - Report/Block

I was quite surprised when I found out that for x <- array(0, c(5,3,1)) , e.g. x[2,,] returns a vector instead of a two-dimensional array matrix Why is it that this array is obviously interpreted as 5 vectors of length 3 instead of 5 3-by-1 arrays? attr(array(0, c(5,3,1)), "dim") yields [1] 5 3 1 as expected, so it seems that the l...

Java pass array to method for calculation and return array

stackoverflow.com - 2012-04-01 23:54:42 - Similar - Report/Block

I came across this post " pass array to method Java " on how to pass an array to a method however when trying to adapt it to my intrest calculator Ive got going I get errors such as "the operator / is undefined for the argument types double[],double" and I am unable to get it resolved. I am also looking to return the whole array since I...

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How do you iterate over an array of character arrays in c?

stackoverflow.com - 2012-01-28 17:13:12 - Similar - Report/Block

Do you have to manually loop through the array once and get a count of the strlen of each character array, sum it, allocate destination with the summed value and then loop over the array again? How do you find the size of the array that contains the arrays of characters so you can iterate over them?...

Renderscript limitation size of array

stackoverflow.com - 2013-04-19 11:37:09 - Similar - Report/Block

I'm doing matrix multiplication in Renderscript. I have my java file which prepares all the arrays. In my Renderscript I have global variables which will be set by the java file. But I have seen there is a limitation. If I want to do a multiplication with 37x37 matrix the results still right. If I do a 38x38 matrix multplication the resul...

store values from string in an array

gamedev.net - 2013-06-08 11:52:59 - Similar - Report/Block

I have a string: map = ("1, 1, 1, 1, 1" + "1, 1, 1, 1, 1" + "1, 1, 1, 1, 1" + "1, 1, 1, 1, 1" + "1, 1, 1, 1, 1"); That I want to store in an array somehow, or be able to store the values of the string in 3 seperate arrays. With these arrays, I'm going to create a map of blocks. I don't know how to set these values though. The x array...

Comparison of methods appending arrays in a foreach loop

stackoverflow.com - 2013-05-05 16:01:36 - Similar - Report/Block

I've set up an array of associative arrays (with dummy data for testing) like this: // To hold dropdown filter options $results['filters'] = array('Client' => array( array('a' => '1') ), 'Project' => array( array('b' => '2') ), 'Status' => array( array('c' => '3') ), 'User' => array( array('d' => '4') ) ); Can anyone tell me why this...

Reading hex string blocks from a file and putting them into an array in java

stackoverflow.com - 2012-04-15 04:12:01 - Similar - Report/Block

I want to read the a file where packets are stored as hex files and store them in arrays. For example, the there are three blocks here and I need to store them in 3 separate arrays. The arrays should contain these hex strings. Could someone please advice me the way to do it correctly? I tried using buffered reader and a string buffer but...

Implementing a Harmonic Product Spectrum algorithm in java

stackoverflow.com - 2012-05-05 15:00:45 - Similar - Report/Block

I am currently working on a guitar tuner program in Java and I am trying to implement a Harmonic Product Spectrum Algorithm in order to determine the fundamental frequency. For the moment, I made a method that downsamples my spectrum by a factor I am now trying to multiply all my different downsampled spectrums together. I am coding in ja...

How do I modify an array while I am iterating over it in Ruby?

stackoverflow.com - 2009-11-21 01:07:20 - Similar - Report/Block

I'm just learning Ruby so apologies if this is too newbie for around here, but I can't work this out from the pickaxe book (probably just not reading carefully enough). Anyway, if I have an array like so: arr = [1,2,3,4,5] ...and I want to, say, multiply each value in the array by 3, I have worked out that doing the following: arr.each {|...

underscore.js - Determine if all values in an array of arrays match

stackoverflow.com - 2012-04-11 18:57:41 - Similar - Report/Block

I have an array of arrays, which looks something like this: [["Some string", "Some other string"],["Some third string", "some fourth string"]] I think I can use the _.all method in Underscore to determine if all of the arrays match 100% (that is all of their values match), but I'm not sure how to write the required iterator to run the c...

Return string from multiple array items

stackoverflow.com - 2013-04-25 14:06:42 - Similar - Report/Block

I have multiple arrays which have code string items in them. I need to match the code from a given string and then return a class name from the matched array. Might be better if I show you want I've got. So below are the arrays and underneath this is the string I need to return if the given string matches a item from within the array. So...

Android - Reading arrays.xml

stackoverflow.com - 2012-02-28 17:08:58 - Similar - Report/Block

I'm new to Android development so please bear with me. I have a set of preferences stored in arrays.xml that looks similar to this: <string-array name="firstname"> <item name="1">Bob</item> <item name="6">Kevin</item> <item name="3">Peter</item> <item name="4">...

Creating new two-dimensional PHP Array where keys match

stackoverflow.com - 2012-04-06 10:53:04 - Similar - Report/Block

I have the following three arrays and need to create a new two-dimensional array where the keys match. Array [0] => Item 0 [1] => Item 1 [2] => Item 2 [3] => Item 3 Array [0] => £35.00 [1] => £60.00 [2] => £24.00 [3] => £79.00 Array [0] => 2 [1] => 1 [2] => 1...

foreach count does not get updated after array_splice

stackoverflow.com - 2012-04-16 12:16:58 - Similar - Report/Block

I have two large arrays: $a = array('a1','a2','a3','a4'); // and so on $b = array('b1'=>'a1', 'b2'=>'a3', 'b3'=>'a1'); // I would like to get the following result: $a = array('a1'=>array('b1', 'b3'), 'a2'=>array(), 'a3'=>array('b2') ); I could just do: foreach($a as $aa){ foreach($b as $bb){ // check with if then add t...

JavaScript sort an array of arrays by the day of the week

stackoverflow.com - 2013-05-15 13:07:55 - Similar - Report/Block

I have the following variable ( console.log(response) "['2013-04-15', 26]", "['2013-04-16', 10]", "['2013-04-17', 51]", "['2013-04-18', 46]", "['2013-04-19', 32]", "['2013-04-20', 50]", "['2013-04-21', 26]", "['2013-04-22', 31]", "['2013-04-23', 48]", "['2013-04-24', 821]", "['2013-04-25', 917]", "['2013-04-26', 949]", "['2013-04-27', 405...

How to create an NSMutableDictionary containing many NSMutableArrays

stackoverflow.com - 2012-04-17 16:18:33 - Similar - Report/Block

I need to dynamically, at run time do the following create a mutable dictionary create x(perhaps thousands) number of arrays that are inside' the dictionary create y (thousands) number of strings for each array. Use the to represent some character pattern for the particular array (ex: 'm-m-' means the array contains strings with two m's...

How to check whether the given object is object or Array in JSON string

stackoverflow.com - 2012-03-22 07:13:28 - Similar - Report/Block

I am getting JSON string from website. I have data which looks like this (JSON Array) {URL:[blah,blah]} but some times this data can be (JSON object) {URL:{try}} I want to do different operations when its object and different when its an array. Till now in my code I was trying to consider only arrays so I am getting following exce...

Undergraduate /6thform: Column Matrices multiplication for DOT PRODUCT

thestudentroom.co.uk - 2013-06-09 11:07:28 - Similar - Report/Block

I understand that for matrices multiplication, you have to have something along these lines for it to work: (m * n) multiplied with (n * p) = (m * p) Where matrix one has m rows and n columns, matrix two has n rows and p columns, thus the resulting matrix has m rows and p columns. However, I've just read that you can multiply two 3 by 1 c...

Make Aptana / Eclipse formatter ignore arrays

stackoverflow.com - 2012-04-19 12:04:01 - Similar - Report/Block

Aptana PHP Formatter - use custom formatting rules I don't want the formatter to add newlines for each element in the array, since that more often than not will make the array readable.. Of course one can add // @formatter:off // @formatter:on statements around it, but is there a better way to make the Aptana formatter ignore (nicely han...

Displaying a 2D array in an NSTableView

stackoverflow.com - 2013-03-18 18:27:11 - Similar - Report/Block

I’m trying to learn Objective C by trying to convert a program I use that I wrote in C. The program works with large 2 plus dimensional arrays and does calculations on them so I need to be able to display 2D arrays in a table format on the UI. The best way I can come up with to do that is to convert my C-style arrays row by row to NSMutab...

Mapping Unequal Arrays with Unset Keys - Facebook Graph API

stackoverflow.com - 2012-03-12 05:12:24 - Similar - Report/Block

Anyone know how to do this? I'm trying to get an array that holds the ID's as the key and the "value" and "created_time" as values associated to the key. If the key has no "value" "but created_time" fill in a "0" for the "value" I tried to map two arrays together. I'm getting the data through the Facebook API as JSON output. After I json_...

Checking if the array in foreach loop is empty or not

stackoverflow.com - 2012-04-05 03:14:57 - Similar - Report/Block

I am trying to check if my array is empty or not but strangely I can't get it working. foreach ($friend as $key => $id){ $friendActivity = $db->friendActivity($id); if (!empty($friendActivity)) { //rest of the code } I have used var_dump($friendActivity) before the if statement and the result is as follow: arra...

Matchmathic for Android

androidzoom.com - 2013-04-18 14:08:08 - Similar - Report/Block

ius information AB Take your math skills to new levels with this fun and addicting multiplication game! Find the longest number combo to match the target number, swipe your finger over the board to multiply the numbers. Use power-ups to your advantage and count... FREE

Comparing elements

stackoverflow.com - 2012-09-23 18:54:15 - Similar - Report/Block

for (index=1; index<=15; index++) { if (undefined != sku[index]) { found = jQuery.inArray(sku[index], mr_sku); if( found == -1){ //not in array alert( sku[index] + " NOT FOUND - delete index " + index ); } else { // in array alert("FOUND"); } Two arrays - sku and mr_sku = trying to find the values from 1 to 15 where not undefine...

MATLAB: fill array with numbers in increments

stackoverflow.com - 2012-03-19 11:56:59 - Similar - Report/Block

I'd like to have a MATLAB array fill a column with numbers in increments of 0.001. I am working with arrays of around 200,000,000 rows and so would like to use the most efficient method possible. I had considered using the following code: for i = 1 : size(array,1) array(i,1) = i * 0.001; There must be a more efficient way of doing thi...

Does a 2D Arraylist exist?

java-forums.org - 2013-02-23 22:25:17 - Similar - Report/Block

I have created 2 regular 1-D Arrays but I want to stick them all into 1 ArrayList. Is this even possible. I want to tidy up the whole thing if possible. I am new to Java and this is for a homework assignment. My three arrays are all Integer Arrays so the ArrayList of Arrays would be of Integers if that makes any sense to anyone. Any help...

PHP looping multidimensional array

stackoverflow.com - 2012-05-04 13:44:40 - Similar - Report/Block

Not entirely sure how to adequately title this problem, but it entails a need to loop through any array nested within array, of which may also be an element of any other array - and so forth. Initially, I thought it was required for one to tag which arrays haven't yet been looped and which have, to loop through the "base" array completely...

Using Python to multiply/divide columns in CSV files

stackoverflow.com - 2012-02-27 17:35:48 - Similar - Report/Block

So I have a number of CSV files with 5 columns of numbers in each file. I would like to perform a few operations (multiplication, division etc.) on each column in each of the CSV files using Python. I am a beginner in python and I am only familiar with the pywinauto module. If any one knows a simple way of doing this, it would be great to...

Remove a string from string array

stackoverflow.com - 2013-03-14 13:23:29 - Similar - Report/Block

I am very beginner in JavaScript. I have an string array like this : 123,432,123,543,123,123 I want to remove the 3dr number from this string. I have found following function to remove a text value from an string array, but it's not working for arrays with duplicated values in them. Array.prototype.removeByValue = function (val) { for (v...

PHP - Changing content dynamically

stackoverflow.com - 2013-02-26 03:03:31 - Similar - Report/Block

Alright, so I have a PHP app that, in essence, fills up an array with references to elements in an XML file, does a shuffle() on the array to randomise it, then cycles through the array, displaying the data from the array (and ergo the XML file) on the screen. My current code works fine - It fills the array, shuffles it, and displays the...


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