array-difference

I have two arrays, for example: array1=numpy.array([1.1, 2.2, 3.3]) array2=numpy.array([1, 2, 3]) How can I find the difference between these two arrays in Python, to give: [0.1, 0.2, 0.3] As an array as well? Sorry if this is an amateur question - but any help would be greatly appreciated! This is pretty simple with numpy , just subtract the arrays: diffs = array1 - array2 I get: diffs == array([ 0.1, 0.2, 0.3]) mark jay You can also use numpy.subtract It has the advantage over the difference operator, - , that you do not have to transform the sequences (list or tuples) into a numpy arrays —

I get array to string conversion error for the following line: $diff = array_diff($stockist, $arr); Here, $arr is an array decoded from a JSON file. Using the is_array() function I was able to verify that both parameters are arrays. Can someone point me the problem $stockist = array(); while (!feof($file_handle)) { $line_of_text = fgetcsv($file_handle); $query = "SELECT * FROM reorderchart WHERE medicine = '" . trim($line_of_text[3]) . "' ORDER BY medicine"; $result = mysql_query($query); if (trim($line_of_text[2]) - trim($line_of_text[1]) <= 0) { while ($row = mysql_fetch_array($result)) {

I have the following two arrays: $array_one = array('colorZero'=>'black', 'colorOne'=>'red', 'colorTwo'=>'green', 'colorThree'=>'blue', 'colorFour'=>'purple', 'colorFive'=>'golden'); $array_two = array('colorOne', 'colorTwo', 'colorThree'); I want an array from $array_one which only contains the key-value pairs whose keys are members of $array_two (either by making a new array or removing the rest of the elements from $array_one ) How can I do that? I looked into array_diff and array_intersect , but they compare values with values, and not the values of one array with the keys of the other. If

I've got two arrays of Tasks - created and assigned. I want to remove all assigned tasks from the array of created tasks. Here's my working, but messy, code: @assigned_tasks = @user.assigned_tasks @created_tasks = @user.created_tasks #Do not show created tasks assigned to self @created_not_doing_tasks = Array.new @created_tasks.each do |task| unless @assigned_tasks.include?(task) @created_not_doing_tasks << task end end I'm sure there's a better way. What is it? Thanks :-) hobodave You can subtract arrays in Ruby: [1,2,3,4,5] - [1,3,4] #=> [2,5] ary - other_ary → new_ary Array Difference

What's the fastest/best way to compare two arrays and return the difference? Much like array_diff in PHP. Is there an easy function or am I going to have to create one via each() ? or a foreach loop? Tats_innit Working demo http://jsfiddle.net/u9xES/ Good link (Jquery Documentation): http://docs.jquery.com/Main_Page {you can search or read APIs here} Hope this will help you if you are looking to do it in JQuery. The alert in the end prompts the array of uncommon element Array i.e. difference between 2 array. Please lemme know if I missed anything, cheers! Code var array1 = [1, 2, 3, 4, 5, 6];