average

I am writing a function for getting the average of the clocks it takes to call a specific void (*)(void) aka void -> void function a specific number of times. I am worried that it if the sample size gets too large, the sum of the observations will overflow and make the average invalid. is there a standard approach to removing the possibility of sum overflowing in these kinds of problems? Note: I understand that this example is too naive to conclude anything about performance; I am interested eliminating the possibility of sum overflow, not concluding anything performance wise. Note2: I also

Here's a sample of my matrix: A B C D E 1 0 0 1 1 0 0 0 0 0 0 0 1 1 0 0 2 1 You can think of each row as a respondent and each column as an item on a questionnaire. My goal is to take an average of the sum of each row (i.e. total score for each respondent) without creating a new column AND accounting for the fact that some or all of the entries in a given row are empty (e.g., some respondents missed some items [see row 5] or didn't complete the questionnaire entirely [see row 3]). The desired solution for this matrix = 1.67, whereby [1+0+0+1+1 = 3] + [0+0+0+0+0 = 0] + [0+0+1+1+0 = 2]/3 == 5/3

I am using a query that takes an average of all the records for each given id... $query = "SELECT bline_id, AVG(flow) as flowavg FROM blf WHERE bline_id BETWEEN 1 AND 30 GROUP BY bline_id ORDER BY bline_id ASC"; These records are each updated once daily. I would like to use only the 10 most recent records for each id in my average. Any help would be qreatly appreciated. blf table structure is: id | bline_id | flow | date Another option is to simulate ROW_NUMBER(). This statement creates a counter and resets it every time it encounters a new bline_id. It then filters out any records that aren't

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 also the average time these transactions occurred CREATED_ON which is datetime I still have not find a

this is my table: I want to fetch records of Those Vendor which contain ServiceDescription "Plaster" or Skills "Plaster" or is in Category "Plaster" and also want to calculate averagerating of those Vendor. note:If there is no review Of any vendor then also that records should come. this is my query: select * from UserDetails u ,VendorInCategory v ,CategoryMaster c ,Review rv where v.CategoryId=c.Id and u.Id=r.UserId and u.Id=rv.VendorId and v.VendorId=u.Id and ((u.ServiceDescription like '%Plaster%' ) or (u.Skills like '%Plaster%') or (c.Name like '%Plaster%')) here problem in above query is

I am reading a .csv file, want to extract certain values from it and write these to a new result.csv (B) file. I tried doing this with the code (A), which is only partially working. In the definition i put all the variables from which i want to eventually extract the matching values out of the .csv file i am reading. (except for "record_id" and "abbreviation", because i will fill these manually) Now by running code (A), it generates the following output in the result.csv: Current output record_id abbreviation patient_id step_count distance ambulation_time velocity cadence normalized_velocity