sum

问题 I am trying to create a function where: The output list is generated from random numbers from the input list The output list is a specified length and adds to a specified sum ex. I specify that I want a list that is 4 in length and adds up to 10. random numbers are pulled from the input list until the criteria is satisfied. I feel like I am approaching this problem all wrong trying to use recursion. Any help will be greatly appreciated!!! EDIT: for more context on this problem.... Its going

问题 I am trying to create a function where: The output list is generated from random numbers from the input list The output list is a specified length and adds to a specified sum ex. I specify that I want a list that is 4 in length and adds up to 10. random numbers are pulled from the input list until the criteria is satisfied. I feel like I am approaching this problem all wrong trying to use recursion. Any help will be greatly appreciated!!! EDIT: for more context on this problem.... Its going

问题 This question already has answers here : How to aggregate objects properties? (6 answers) Closed 4 months ago . So I was working on the some column merging and filtering,but I am having trouble calculating 2 object keys (columns) from an array of objects and then mapping that result to an object key to a new array Example: var foodRevenue = [{ "Month": "2011-01", "week1_Revenue": "100.00", "week2_Revenue": "300.51", "Week3_Reenue": "200.09", "Month1_TotalRevenue": "0" }]; I want to calculate

问题 This question already has answers here : How to aggregate objects properties? (6 answers) Closed 4 months ago . So I was working on the some column merging and filtering,but I am having trouble calculating 2 object keys (columns) from an array of objects and then mapping that result to an object key to a new array Example: var foodRevenue = [{ "Month": "2011-01", "week1_Revenue": "100.00", "week2_Revenue": "300.51", "Week3_Reenue": "200.09", "Month1_TotalRevenue": "0" }]; I want to calculate

问题 I am trying to convert a Spreadsheet from Excel to Google Sheets. Most formulas have worked as expected, with the exception of this formula: =SUM('J Slater:Job Sheet'!C6) I am using it to sum a specific cell over a range of sheets this formula allows sheets to be added between the range an also be added to the sum cell without any change to the formula. I can't find a way of replicating this in Google Sheets. 回答1: You can do this with custom functions in Google sheets: Script: /** * @returns

问题 I have a nxm matrix and I need to find the maximum of sum of its values in distinct rows and columns. For example considering the following Matrix: m1 m2 m3 n1 1 2 3 n2 4 5 6 n3 7 8 9 n4 10 11 12 The max will be 12+8+4 = 24 Note that finding the max and eliminating all values belonging to that column or row is not a good solution as it doesn't work for all cases. The exception for above will be the following: m1 m2 n1 17 1 n2 18 15 If you find 18 and remove 17 and 15, the sum will be 18+1 =

问题 I have a nxm matrix and I need to find the maximum of sum of its values in distinct rows and columns. For example considering the following Matrix: m1 m2 m3 n1 1 2 3 n2 4 5 6 n3 7 8 9 n4 10 11 12 The max will be 12+8+4 = 24 Note that finding the max and eliminating all values belonging to that column or row is not a good solution as it doesn't work for all cases. The exception for above will be the following: m1 m2 n1 17 1 n2 18 15 If you find 18 and remove 17 and 15, the sum will be 18+1 =

问题 How to perform a sum just for a list of indices over numpy array, e.g., if I have an array a = [1,2,3,4] and a list of indices to sum, indices = [0, 2] and I want a fast operation to give me the answer 4 because the value for summing value at index 0 and index 2 in a is 4 回答1: You can use sum directly after indexing with indices : a = np.array([1,2,3,4]) indices = [0, 2] a[indices].sum() 回答2: The accepted a[indices].sum() approach copies data and creates a new array, which might cause problem

问题 I have this json strings [{"count": 9, "name": "fixkit", "label": "Repair Kit"}, {"count": 1, "name": "phone", "label": "Telefoon"}] [{"count": 3, "name": "phone", "label": "Telefoon"}] [{"count": 5, "name": "kunststof", "label": "Kunststof"}, {"count": 6, "name": "papier", "label": "Papier"}, {"count": 2, "name": "metaal", "label": "Metaal"}, {"count": 2, "name": "inkt", "label": "Inkt"}, {"count": 3, "name": "kabels", "label": "Kabels"}, {"count": 2, "name": "klei", "label": "Klei"}, {

问题 I have a database like this: Question table: QId | Title ---------- 1 | SR 4 | TR 9 | AA Answer table: RId | QId ---------- 2 | 1 3 | 1 5 | 4 6 | 4 7 | 1 8 | 4 Vote table: PubId | Type ------------- 2 | P 3 | N 3 | N 1 | P 1 | N 5 | P 4 | P 2 | N 2 | P I want to calculate the score of every question. The score of a question is the difference between positive and negative votes on that question and all of its answers. For example the score of question 1 (with answers as 2, 3 and 7) with QId of