average

问题 I have an array: array = ["0:00:31", "0:00:52", "0:01:05", "0:00:55", "0:01:33", "0:00:05", "0:00:01", "0:05:10", "0:02:40", "0:03:03", "0:01:33", "0:00:00"] and I need to average all of the times in the array that are not equal to "0:00:00" . "0:00:00" should just be thrown out. What's the best way to do this? I'm currently looping through the array, removing all of the 0:00:00 values, turning the strings into integers and doing an average - But it seems like a lot of code for what I'm

问题 "Using awk to bin values in a list of numbers" provide a solution to average each set of 3 points in a column using awk. How is it possible to extend it to an indefinite number of columns mantaining the format? For example: 2457135.564106 13.249116 13.140903 0.003615 0.003440 2457135.564604 13.250833 13.139971 0.003619 0.003438 2457135.565067 13.247932 13.135975 0.003614 0.003432 2457135.565576 13.256441 13.146996 0.003628 0.003449 2457135.566039 13.266003 13.159108 0.003644 0.003469 2457135

问题 I have a time series data where I want to perform aggregation on it by average function. Aggregation should be performed in 10-minute intervals: (HH-1):50, HH:00, HH:10, HH:20, HH:30, HH:40 or alternatively in 10-minute intervals: (HH-1):51, HH:01, HH:11, HH:21, HH:31, HH:41. Note: hourly mean of 5 o'clock is average of (4):51, 5:01,5:11, 5:21, 5:31, 5:41 values. The problem is that a data-set includes the variables with odd and even frequencies in time. So, I cannot assign an aggregation for

问题 I want to calculate average of time-in for a user for particular duration , i have timestamp values for each time-in . To calculate average i want to add all timestamps and divide by no of days . But sum of all timestamps gives wrong input so i want convert timestamps to seconds so i can add them and calculate average . I am using following code . $timeInTotalSec = 0; $timeInTotalSec += intval(date("H",$punchintime)) * 60 * 60; $timeInTotalSec += intval(date("i",$punchintime)) * 60;

问题 As an example I will have this table from MySQL Id | Name | Grade 1 | Grade 2 | Average 1. | Jack | 9 | 10 | 2. | Jimmy | 9 | 8 | 2. | Emmy | 9 | 7 | So, in the Average field from this table, I need to calculate the AVERAGE from the Grade 1 and Grade 2 fields. I tried a lot of possiblities which I know they are wrong like: UPDATE table_name SET Average=AVG(Grade 1 + Grade 2) I there a way to do this? Can anyone help me? Thanks! 回答1: You need to add the fields together and divide by the number

问题 I'm looking for a way to calculate "global" or "relative" values during a MapReduce process - an average, sum, top etc. Say I have a list of workers, with their IDs associated with their salaries (and a bunch of other stuff). At some stage of the processing, I'd like to know who are the workers who earn the top 10% of salaries. For that I need some "global" view of the values, which I can't figure out. If I have all values sent into a single reducer, it has that global view, but then I loose

问题 I am very new to the WebGL subject. What I want to do is to calculate the average color of 6 different framebuffers like the ones below in the picture. Now I am wondering what the best way to go about it would be? I tried to do gl.readPixels(0, 0, 256, 256, gl.RGBA, gl.UNSIGNED_BYTE, pixelValues); but that seems to be very slow... Is there a way that this can happen on the graphics card? this is how the FBO is set up - I have this from a tutorial: ... 回答1: You have two options Write a

问题 I have a sample of some kind that can create somewhat noisy output. The sample is the result of some image processing from a camera, which indicates the heading of a blob of a certain color. It is an angle from around -45° to +45°, or a NaN , which means that the blob is not actually in view. In order to combat the noisy data, I felt that exponential smoothing would do the trick. However, I'm not sure how to handle the NaN values. On the one hand, involving them in the math would result in a

问题 I am working on a small project in the lab with an Arduino Mega 2560 board. I want to average the signal (voltage) of the positive-slope portion (rise) of a triangle wave to try to remove as much noise as possible. My frequency is 20Hz and I am working with a data rate of 115200 bits/second (fastest recommended by Arduino for data transfer to a computer). The raw signal looks like this: My data is stored in a text file, with each line corresponding to a data point. Since I do have thousands

问题 I'm trying to implement system-wide login throttling and I need to calculate the daily average number of failed login attempts from the last 3 months. I'm currently inserting a record on every login fail, each with a timestamp. How can I do this in MySQL? Thanks in advance for your help 回答1: SELECT AVG(cnt) FROM (SELECT COUNT(*) AS cnt FROM mytable WHERE `date` BETWEEN DATE_SUB(NOW(), INTERVAL 3 MONTH) AND NOW() GROUP BY DATE(`date`)) x Assuming you have a table mytable with field date of