average

问题 I have a CSV file, format as follows: City,Job,Salary Delhi,Doctors,500 Delhi,Lawyers,400 Delhi,Plumbers,100 London,Doctors,800 London,Lawyers,700 London,Plumbers,300 Tokyo,Doctors,900 Tokyo,Lawyers,800 Tokyo,Plumbers,400 Lawyers,Doctors,300 Lawyers,Lawyers,400 Lawyers,Plumbers,500 Hong Kong,Doctors,1800 Hong Kong,Lawyers,1100 Hong Kong,Plumbers,1000 Moscow,Doctors,300 Moscow,Lawyers,200 Moscow,Plumbers,100 Berlin,Doctors,800 Berlin,Plumbers,900 Paris,Doctors,900 Paris,Lawyers,800 Paris

问题 I have an integer property which is updated every second with a signal-strength value ranging from 0 - 100. I'd like to be able to keep an ongoing measure of the moving average over the last 10, 25, 50 measurements. What's the most efficient way of doing this? I'm currently thinking of implementing a set of FIFO queues using NSMutableArray and popping the leading value every time I add a new one at the end once the array has the requisite number of entries. However, I'm not sure if there's a

问题 I am trying to calculate average for an array of floats. I need to use indices because this is inside a binary search so the top and bottom will move. (Big picture we are trying to optimize a half range estimation so we don't have to re-create the array each pass). Anyway I wrote a custom average loop and I'm getting 2 places less accuracy than the c# Average() method float test = input.Average(); int count = (top - bottom) + 1;//number of elements in this iteration int pos = bottom; float

问题 I am using the averageifs function, and have one column where I need to calculate the average if either of the criteria are true. I have tried using the OR function, and tried the curly brackets, but both give me errors. =AVERAGEIFS(N1:N612,I1:I612,{"FL","IF"}) There are more ranges, but the coding for those is fine. To be clear, I want to return an average if column "I" contains (specifically) the letters FL, OR the letters IF. Any other letters should mean that entry is not averaged. TIA!

问题 I am using the averageifs function, and have one column where I need to calculate the average if either of the criteria are true. I have tried using the OR function, and tried the curly brackets, but both give me errors. =AVERAGEIFS(N1:N612,I1:I612,{"FL","IF"}) There are more ranges, but the coding for those is fine. To be clear, I want to return an average if column "I" contains (specifically) the letters FL, OR the letters IF. Any other letters should mean that entry is not averaged. TIA!

问题 If I have an array of DateTime values: List<DateTime> arrayDateTimes; What's the way to find the average DateTime among them? For instance, if I have: 2003-May-21 15:00:00 2003-May-21 19:00:00 2003-May-21 20:00:00 the average should be: 2003-May-21 18:00:00 回答1: If you have large list you can use below method var count = dates.Count; double temp = 0D; for (int i = 0; i < count; i++) { temp += dates[i].Ticks / (double)count; } var average = new DateTime((long)temp); 回答2: This shouldn't

问题 If I have an array of DateTime values: List<DateTime> arrayDateTimes; What's the way to find the average DateTime among them? For instance, if I have: 2003-May-21 15:00:00 2003-May-21 19:00:00 2003-May-21 20:00:00 the average should be: 2003-May-21 18:00:00 回答1: If you have large list you can use below method var count = dates.Count; double temp = 0D; for (int i = 0; i < count; i++) { temp += dates[i].Ticks / (double)count; } var average = new DateTime((long)temp); 回答2: This shouldn't

问题 I've created a view that contains: student_full_name subject_code result Jennifer Higgins CS1234 81 Jennifer Higgins CS1235 90 Kal Penn CS1234 70 Kal Penn CS1235 60 Han Solo CS1234 45 Han Solo CS1235 70 I am trying to get: Average result of each student so like say Jennifer Higgins enrolled in CS1234 and CS1235. Her average mark would be 85.50. Then Jennifer Higgins marks would be compared to the average mark of all enrolments So totalling up the AVG(result) for all subjects. The query would

问题 Code: ArrayList <Integer> marks = new ArrayList(); String output = "Class average:" + calculateAverage() + "\n" + "Maximum mark:" + calculateMaximum() + "\n" +"Minimum mark:" + calculateMinimum() + "\n" + "Range of marks:" + range; analyzeTextArea.setText(output); private double calculateAverage(double [] marks) { double sum = 0; for (int i=0; i< marks.length; i++) { sum += marks[i]; } return sum / marks.length; } Disregard the other things inside the string (minimum, maximum, and range) but

问题 as far as i understood the AVG() function ignores NULL Values. So AVG(4,4,4,4,4,NULL) --> 4 In my case i don´t want this to happen. I need a solution like that: AVG(4,4,4,4,4,NULL) --> 3,33 without replacing the NULL values directly in the table itself. Is there any way to do this? 回答1: Use coalesce() to return the real value of zero for null columns: select avg(coalesce(some_column, 0)) from ... 回答2: You are correct about the behavior of AVG - use COALESCE to convert the NULLs to 0 in the