average

问题 I'm new at php and mysql stuff and i'm trying to use an avg function but i don't know how to. I'm trying to do something like this: mysql_connect(localhost,$username,$password); @mysql_select_db($database) or die ("Did not connect to $database"); mysql_query("AVG(column1) FROM table1 ") or die(mysql_error()); mysql_close(); echo AVG(column1); (Q1)I'd like to see the value printed in the screen, but i'm getting nothing but an error message. How could I print this average on the screen ? (Q2)If

问题 i need to print out average height from a .txt file. How do I write it in an easy way? The .txt file has these numbers: 12 14 59 48 45 12 47 65 152 this is what i've got so far: import math text = open(r'stuff.txt').read() data = [] with open(r'stuff.txt') as f: for line in f: fields = line.split() rowdata = map(float, fields) data.extend(rowdata) biggest = min(data) smallest = max(data) print(biggest - smallest) 回答1: To compute the average of some numbers, you should sum them up and then

问题 I have a problem in showing the decimals on the average. It keeps showing .00 or .1. I tried to put it in double, but I still get the same results.Also, I want to include the first integer that I input to the sum, but I have no idea how.Please help: import java.io.*; import java.util.*; public class WhileSentinelSum { static final int SENTINEL= -999; public static void main(String[] args) { // Keyboard Initialization Scanner kbin = new Scanner(System.in); //Variable Initialization and

问题 how to execute a "MySQL" query for all values that are in my column ? Here is my table Table A |----------------------|---------------------|------------------| | id | CL | horse | |----------------------|---------------------|------------------| | 1 | 1er | C.Ferland | | 2 | 5e | Abrivard | | 3 | 3e | P. Hawas | |----------------------|---------------------|------------------| I want the output to be: +------------+--------+---------+---------+-----------+ | horse | Top_1 | Top_2_3 | TOP_4_5

问题 Right now i have an array that is three dimensions. I have 200 rows, 200 columns and 24 "slices" in the third dimension dim=c(200,200,24) What I need is an average of the slices resulting in a new matrix. I need a 200 by 200 matrix and the values are the result of averaging up the appropriate slices. So in the location that would be row 1, col 1, I need the average of all the row 1's and col 1's from my array. Is there a way to do this? 回答1: Here's one attempt using a simple example: test <-

问题 I have a dataframe of OHLCV data. I would like to know if anyone knows any tutorial or any way of finding ADX(Average directional movement ) using pandas? import pandas as pd import yfinance as yf import matplotlib.pyplot as plt import datetime as dt import numpy as nm start=dt.datetime.today()-dt.timedelta(59) end=dt.datetime.today() df=pd.DataFrame(yf.download("MSFT", start=start, end=end)) The average directional index, or ADX, is the primary technical indicator among the five indicators

问题 I need to calculate seasonal averages for my data every year, the calculation of average is not in the same calendar year. I have defined season by date and am looking to calculate average temperature, precipitation etc for that time period every year (eg 12/21/1981 to 02/15/1982 , 12/21/1982 to 02/15/1983 ) and so on. Is there an efficient way of doing this in R? Below is my data: library(xts) seq <- timeBasedSeq('1981-01-01/1985-06-30') Data <- xts(1:length(seq),seq) Thanks 回答1: If we push

问题 I have a formula in a Google Sheet that is averaging the values in a row... =AVERAGEIF(A2:L2,"<>0") Simple, right? However, I cannot figure out how to get the ARRAYFORMULA to work for this. =ARRAYFORMULA(AVERAGEIF(A2:L,"<>0") That formula only averages all of the cells in the range, instead of returning the average for each row. What am I missing? 回答1: you were close. try: =ARRAYFORMULA(QUERY(TRANSPOSE(QUERY(TRANSPOSE(A2:L), "select "&TEXTJOIN(",", 1, IF(LEN(A2:A), "avg(Col"&ROW(A2:A)-ROW(A2)

问题 I have a data frame of character times that I need to average by provider, but I'm not sure how to average them using just the time without the date. For the example below: provider time USA 9:26:46 USDA 9:26:18 USDA 9:10:17 OIL 10:00:00 USA 6:20:56 USDA 7:19:13 OIL 11:00:00 The correct output for OIL would be the average between 10:00 and 11:00, and would look like: provider average OIL 10:30 Does anyone know how to average just time without incorporating date using POSIX? 回答1: mean works as

问题 I have rating table which have rating for every product given by user, I am retrieving all rating records, but at the same time I want to get avg rating based on per product but I am unable to get ouptput Query : $this->db->select('ratings.*'); $this->db->select('select AVG(ratings) as avg_rating from ratings group by product_id'); $this->db->from('ratings'); $this->db->join('users','users.id=ratings.user_id'); $this->db->get()->result(); Rating table id user_id product_id rating 1 4 1 4 2 5