You can use sum() with a generator expression: with open(‘data.txt’) as f: print sum(1 for _ in f) Note that you cannot use len(f), since f is an iterator. _ is a special variable name for throwaway variables, see What is the purpose of the single underscore “_” variable in Python?. You can use len(f.readlines()), … Read more
Seems like you expected the query to return running totals, but it must have given you the same values for both partitions of AccountID. To obtain running totals with SUM() OVER (), you need to add an ORDER BY sub-clause after PARTITION BY …, like this: SUM(Quantity) OVER (PARTITION BY AccountID ORDER BY ID) But … Read more
It’s best if you used an alias for your SUM: SELECT SUM(`field`) as `sum` FROM `table_name` And then, you’ll be able to fetch the result normally by accessing the first result row’s $row[‘sum’].
You can extend your strategy to an arbitrary number of sub-regions, and reduce them recursively, using tasks: #include<vector> #include<iostream> using namespace std; const int n = 10000; const int baseLength = 100; int f(int ii) { return ii; } int recursiveSumBody(int * begin, int * end){ size_t length = end – begin; size_t mid = … Read more
In case you want the sample to follow a uniform distribution, the problem reduces to generate N random numbers with sum = 1. This, in turn, is a special case of the Dirichlet distribution but can also be computed more easily using the Exponential distribution. Here is how: Take a uniform sample v1 … vN … Read more
Use function array_reduce() to combine the items having the same city: $input = array( array(‘city’ => ‘NewYork’, ‘cash’ => ‘1000’), array(‘city’ => ‘Philadelphia’, ‘cash’ => ‘2300’), array(‘city’ => ‘NewYork’, ‘cash’ => ‘2000’), ); $output = array_reduce( // Process the input list $input, // Add each $item from $input to $carry (partial results) function (array $carry, … Read more
So, first you need $amountsArray to get assigned the values you listed, somehow. Then: $bankTotals = array(); foreach($amountsArray as $amount) { $bankTotals[$amount[‘name’]] += $amount[‘amount’]; } Output: (Demo) Warning: Undefined array key “Bank BRI” Warning: Undefined array key “Bank BCA” Warning: Undefined array key “Bank CIMB Niaga” Warning: Undefined array key “Bank BNI” Warning: Undefined array … Read more
I don’t think there’s any built-in function that would let you sum the values of a multidimensional array. However, here’s a way of doing it using a lambda-style function. Let’s suppose this is your array: [items] => Array ( [0] => Array ( [ID] => 11 [barcode] => 234334 [manufacturer] => Dell [model] => D630 … Read more
If I understand you correct you want to place in the footer getCol and footerData methods: var grid = $(“#list”), sum = grid.jqGrid(‘getCol’, ‘amount’, false, ‘sum’); grid.jqGrid(‘footerData’,’set’, {ID: ‘Total:’, amount: sum}); The getCol can be used to calculate the sum of all numbers from the ‘amount’ column and with respect of footerData you can place … Read more