average

问题 I'm trying to calculate the average of a certain array which contains points (x,y). is it possible to use thrust to find the average point represented as a (x,y) point? i could also represent the array as a thrust::device_vector<int> when each cell contains the absolute position of the point, meaning i*numColumns + j though I'm not sure that the average number represents the average cell. Thanks! 回答1: #include <iostream> #include <thrust/device_vector.h> #include <thrust/reduce.h> struct add

问题 I want to get three different average values from one column (value_to_count) inside one table where all of those average values has a different WHERE clause (according to time). Example Data: ###services#### Table service_id value_to_count time ----------- ----------------------- --------- 604 2054 04:04:50 604 3444 05:00:15 604 2122 07:12:50 604 2144 09:10:50 604 2001 13:12:53 602 2011 15:00:12 602 2115 17:22:35 602 1411 20:22:12 602 1611 21:04:52 602 2111 23:43:45 I'm using this query at

问题 I am trying to write a function to determine the average of an arbitrary number of arguments, all of which have the same type. For learning purposes I am trying to do this using a variadic-templated function. This is what I have so far: template<typename T, class ... Args> T Mean(Args ... args) { int numArgs = sizeof...(args); if (numArgs == 0) return T(); // If there are no arguments, just return the default value of that type T total; for (auto value : args...) { total += value; } return

问题 I have a image with about 50 to 100 small contours. I wish to find the average intensity[1] of each of these contours in real-time[2]. Some of the ways I could think of was Draw contour with FILLED option for each contour; use each image as a mask over the original image, thus find the average. But I presume that this method won't be real-time at first glance. Study OpenCV implementation of drawContour function with the FILLED option and access the pixels enclosed by the contour in the same

问题 Thanks for your responses. Yes, I was looking for the weighted average. rate = [14.424, 14.421, 14.417, 14.413, 14.41] amount = [3058.0, 8826.0, 56705.0, 30657.0, 12984.0] I want the weighted average of the top list based on each item of the bottom list. So, if the first bottom-list item is small (such as 3,058 compared to the total 112,230), then the first top-list item should have less of an effect on the top-list average. Here is some of what I have tried. It gives me an answer that looks

问题 I have a simple query that I want an average on. This is what it looks like now, and I want to know the average of my count per Opname_OpnameID. SELECT Opname_OpnameID, count(*) as 'behandelingen per opname' FROM behandeling GROUP BY Opname_OpnameID 回答1: If you want the average count, presumably over the entire table, then just do exactly that: SELECT AVG(cnt) AS total_avg FROM ( SELECT COUNT(*) AS cnt FROM behandeling GROUP BY Opname_OpnameID ) t; 回答2: You can use count(distinct) and not use

问题 I have a long list with some values. I want to define a function that take the list and calculates the average for every 24 values in the list, and returns the average values as a list. How do I do this? I have 8760 elements in the list, and the list returned should give 8760/24=365 elements. hourly_temp = ['-0.8', '-0.7', '-0.3', '-0.3', '-0.8', '-0.5', '-0.7', '-0.6', '-0.7', '-1.2', '-1.7...] #This goes on, it's 8760 elements def daily_mean_temp(hourly_temp): first_24_elements = hourly

问题 I am trying to generate a report and the following code does not produce the desired results which gives me 2 lines rather than one. The ScoreTypeID could have values of 22, 52, 3 or 4 . if it is 22 or 52, I need the average and if not I need to show 0. Any idea what may be the problem ? Thanks. CASE WHEN FAS1.ScoreTypeID = 22 THEN avg(fas1.totalscore) WHEN FAS1.ScoreTypeID = 52 THEN avg(fas1.totalscore) ELSE 0 END AS 'Total Score', 回答1: I think in your full query, you are missing the GROUP

问题 Somebody already helped me with this query but I made an adaptation and I get a problem : SELECT AVG(tyd.price) AS avg_price, COUNT(tyd.id_product) AS cnt, tyd.id_marchand, tyd.id_product, catalog.price AS c_price, tyd.price AS t_price, tyd.amount AS t_am, pro_tyd.amount AS p_am, pro_tyd.price AS p_price, catalog.img_src, tyd.step, tyd.login AS tyd_l FROM catalog INNER JOIN tyd ON catalog.id_marchand = tyd.id_marchand AND catalog.id_product = tyd.id_product AND tyd.step = "1" INNER JOIN pro

问题 I have the following query in MSSQL: select TRANSACTION_TYPE_ID ,COUNT(TRANSACTION_TYPE_ID)AS NUMBER_OF_TRANSACTIONS ,CAST(SUM(AMOUNT)AS DECIMAL (30,2)) AS TOTAL FROM [ONLINE_TRANSACTION] WHERE CONVERT(CHAR(8), CREATED_ON, 114) >='17:30' AND AMOUNT IS NOT NULL AND TRANSACTION_TYPE_ID !='CHEQUE-STOP-TRANS-TYPE' GROUP BY TRANSACTION_TYPE_ID ORDER BY TRANSACTION_TYPE_ID I want to show the type of transactions TRANSATION_TYPE_ID as above the total amount of each type of transaction as above BUT