deviation

C# Why are timer frequencies extremely off?

由 跟風遠走 提交于 2020-01-09 13:08:50
问题 Both System.Timers.Timer and System.Threading.Timer fire at intervals that are considerable different from the requested ones. For example: new System.Timers.Timer(1000d / 20); yields a timer that fires 16 times per second, not 20. To be sure that there are no side-effects from too long event handlers, I wrote this little test program: int[] frequencies = { 5, 10, 15, 20, 30, 50, 75, 100, 200, 500 }; // Test System.Timers.Timer foreach (int frequency in frequencies) { int count = 0; //

C# Why are timer frequencies extremely off?

由 大兔子大兔子 提交于 2020-01-09 13:07:47
问题 Both System.Timers.Timer and System.Threading.Timer fire at intervals that are considerable different from the requested ones. For example: new System.Timers.Timer(1000d / 20); yields a timer that fires 16 times per second, not 20. To be sure that there are no side-effects from too long event handlers, I wrote this little test program: int[] frequencies = { 5, 10, 15, 20, 30, 50, 75, 100, 200, 500 }; // Test System.Timers.Timer foreach (int frequency in frequencies) { int count = 0; //

C# Why are timer frequencies extremely off?

由 白昼怎懂夜的黑 提交于 2020-01-09 13:07:42
问题 Both System.Timers.Timer and System.Threading.Timer fire at intervals that are considerable different from the requested ones. For example: new System.Timers.Timer(1000d / 20); yields a timer that fires 16 times per second, not 20. To be sure that there are no side-effects from too long event handlers, I wrote this little test program: int[] frequencies = { 5, 10, 15, 20, 30, 50, 75, 100, 200, 500 }; // Test System.Timers.Timer foreach (int frequency in frequencies) { int count = 0; //

I want to calculate each column's sample deviation in data

由 ↘锁芯ラ 提交于 2020-01-06 12:39:04
问题 I am doing cluster analysis based on data "college" which consists of 3 nominal and 20 numeric variables. # select the columns based on the clustering results cluster_1 <- mat[which(groups==1),] #"cluster_1" is a data set which is made by cluster analysis consisting of 125 observations. rbind(cluster_1[, -(1:3)], colMeans(cluster_1[, -(1:3)])) #This is process of calculating each column's mean and attach the means to the bottom of the data set, "cluster_1". Now what I want to know is how to

Calculating moving average/stdev in SAS?

由 霸气de小男生 提交于 2019-12-17 19:30:03
问题 Hye guys, I included a screenshot to help clarify my problem: http://i40.tinypic.com/mcrnmv.jpg. I'm trying to calculate some kind of moving average and moving standard deviation. The thing is I want to calculate the coefficients of variation (stdev/avg) for the actual value. Normally this is done by calculating the stdev and avg for the past 5 years. However sometimes there will be observations in my database for which I do not have the information of the past 5 years (maybe only 3, 2 etc).

Finding the difference between consecutive numbers in a list (Python)

由 北城以北 提交于 2019-12-07 11:36:25
问题 Given a list of numbers, I am trying to write a code that finds the difference between consecutive elements. For instance, A = [1, 10, 100, 50, 40] so the output of the function should be [0, 9, 90, 50, 10] . Here is what I have so far trying to use recursion: def deviation(A): if len(A) < 2: return else: return [abs(A[0]-A[1])] + [deviation(A[1: ])] The output I get, however, (using the above example of A as the input) is [9, [90, [50, [10, None]]]] . How do I properly format my brackets? (I

Finding the difference between consecutive numbers in a list (Python)

由 本秂侑毒 提交于 2019-12-05 15:08:11
Given a list of numbers, I am trying to write a code that finds the difference between consecutive elements. For instance, A = [1, 10, 100, 50, 40] so the output of the function should be [0, 9, 90, 50, 10] . Here is what I have so far trying to use recursion: def deviation(A): if len(A) < 2: return else: return [abs(A[0]-A[1])] + [deviation(A[1: ])] The output I get, however, (using the above example of A as the input) is [9, [90, [50, [10, None]]]] . How do I properly format my brackets? (I've tried guessing and checking but I this is the closest I have gotten) And how do I write this where

Calculating moving average/stdev in SAS?

由 大兔子大兔子 提交于 2019-11-28 11:44:07
Hye guys, I included a screenshot to help clarify my problem: http://i40.tinypic.com/mcrnmv.jpg . I'm trying to calculate some kind of moving average and moving standard deviation. The thing is I want to calculate the coefficients of variation (stdev/avg) for the actual value. Normally this is done by calculating the stdev and avg for the past 5 years. However sometimes there will be observations in my database for which I do not have the information of the past 5 years (maybe only 3, 2 etc). That's why i want a code that will calculate the avg and stdev even if there is no information for the
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