zero

问题 I need to replace "0" row data in pandas with the previous rows non-zero value IF and ONLY IF, the value in the row following the "0" is non zero. I.e. 101 92 78 0 107 0 0 would become: 101 92 78 78 107 0 0 Any ideas how to do this would be much appreciated :-) Thanks! 回答1: using shift you could do In [608]: df.loc[(df.val == 0) & (df.val.shift(-1) != 0), 'val'] = df.val.shift(1) In [609]: df Out[609]: val 0 101.0 1 92.0 2 78.0 3 78.0 4 107.0 5 0.0 6 0.0 回答2: This is answer is similar to

问题 I have a simple numpy array. array([[10, 0, 10, 0], [ 1, 1, 0, 0] [ 9, 9, 9, 0] [ 0, 10, 1, 0]]) I would like to take the median of each column, individually, of this array. However, there are a few 0 values in various places which I would like to ignore in the calculation of the medians. To further complicate, I would like to keep the columns with only 0 entries as having the median of 0 . In this manner, those columns would serve as a bit of a place holder, keeping the dimensions of the

问题 I have a simple numpy array. array([[10, 0, 10, 0], [ 1, 1, 0, 0] [ 9, 9, 9, 0] [ 0, 10, 1, 0]]) I would like to take the median of each column, individually, of this array. However, there are a few 0 values in various places which I would like to ignore in the calculation of the medians. To further complicate, I would like to keep the columns with only 0 entries as having the median of 0 . In this manner, those columns would serve as a bit of a place holder, keeping the dimensions of the

问题 In FacetWP Plugin (for Wordpress) I want to sort my results after 'price', so I added a new custom filter, described in their documentation. Currently, the sort results are looking like this: 4.450 € 399 € 3.990 € I think, the code doesn't recognizes the last zero value. This is my code: add_filter( 'facetwp_sort_options', function( $options, $params ) { $options['price_desc'] = array( 'label' => 'Price (Highest)', 'query_args' => array( 'orderby' => 'price', 'meta_key' => 'price', 'order' =>

问题 I am trying to convert a std::vector of BYTES (or unsigned char) to a std::string. The problem I have is when the first element of the vector is a 0, then this returns an empty string after the conversion. I have tried the 2 methods below. Both string1 and string2 return an empty string. The result I am expecting is a string that starts with 2 x 0s followed by several other characters. // vector of BYTE, contains these 7 elements for example: (0,30,85,160,155,93,0) std::vector<BYTE> data; //

问题 I am taking a beginner Python class and the instructor has asked us to countdown to zero without using recursion. I am trying to use a for loop and range to do so, but he says we must include the zero. I searched on the internet and on this website extensively but cannot find the answer to my question. Is there a way I can get range to count down and include the zero at the end when it prints? Edit: def countDown2(start): #Add your code here! for i in range(start, 0, -1): print(i) 回答1: The

问题 Program finds integeres between commas like "2,33,5" -> 2 33 5. The problem is why is it working if I put for example string like "0,12,4". shouldn't the stringstream put 0 into tmp so the loop was like while(0) at the beginning? vector<int> parseInts(string str) { stringstream ss(str); //getting string vector<int> result; char ch; int tmp; while(ss >> tmp) { //while(IS IT INTEGER ALREADY OR NOT?) result.push_back(tmp); ss >> ch; } return result; 回答1: shouldn't the stringstream put 0 into tmp

问题 I have created a code which basically generates a random 20 digit number. Code below: import random from random import randint n=20 def digit(n): range_start = 10**(n-1) range_end = (10**n)-1 return randint(range_start, range_end+1) print(digit(n)) The output of this code for example is: 49690101904335902069 Now given this code I'm just wondering how I can go about to counting the number of zeros in the output, so essentially I'm trying to create a new function called count_zero(): , but I

问题 I have two tables one Employee and mailing Subscriptions Employee looks like this: Name (pk) | Surname | Age mailing Subsriptions MailId (pk)| EmployeeName (fk)|Description | Date I wanted to subscription number for each customer, therefore I tried the following query: Select COUNT(c.Name) From Employee INNER JOIN mailingSubscriptions as m ON c.Name = m.EmployeeName; It will give me all counts for each Employee that has an entry in the mailing subscription. My problem is that I want to see

问题 I am currently using a formula to calculate a variable, which looks like: =(Fields!MontantInitialRegime.Value/Fields!MontantInitial.Value)*Fields!SoldeFacture.Value It works well, except for the cases where both numerator and denominator equal zero. I've done some research and I've tried to solve it by using the formula below, which doesn't work. =IIF(Fields!MontantInitialRegime.Value = 0, Fields!SoldeFacture.Value, Fields!MontantInitialRegime.Value / IIF(Fields!MontantInitial.Value = 0,