percentage | 易学教程

How should a certain percentage of evenly-distributed elements of a Python list be extracted?

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问题 I have a list of data points. For the full run of my program, I'll use all of the data points, but for testing of the code, I want to use only a small percentage of them in order that the program run in a short time. I do not want simply to take the first n elements of the list, though; I want to select an even distribution of the elements from the list. So, if I'm using 50% of the data points, I might want to select from the list of data points every second data points. Basically, I want to

Divide two counts from one select

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问题 I have a table like this: date(timestamp) Error(integer) someOtherColumns I have a query to select all the rows for specific date: SELECT * from table WHERE date::date = '2010-01-17' Now I need to count all rows which Error is equal to 0(from that day) and divide it by count of all rows(from that day). So result should look like this Date(timestamp) Percentage of failure 2010-01-17 0.30 Database is pretty big, millions of rows.. And it would be great if someone know how to do this for more

Calculate percentage between two values

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问题 I have two columns that hold numbers for which I am trying to calculate the difference in % between and show the result in another column but the results seem to be wrong. This is the code in question. SELECT GenPar.ParameterValue AS ClaimType, COUNT(Submitted.ClaimNumber) AS SubmittedClaims, COUNT(ApprovalProvision.ClaimNumber) AS ApprovedClaims, COUNT(Declined.ClaimNumber) AS DeclinedClaims, COUNT(Pending.ClaimNumber) AS PendingClaims, ISNULL(SUM(SubmittedSum.SumInsured),0) AS

css calc number division

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问题 If I use a calculator, 2/3 is 0.6666666667 which is about 67% . However if I try to do the same thing with css calc I get an error. width: calc(2 / 3); Is there a working way for this? I don't think it looks that good writing it like 0.666666666667 . Any ideas are welcome. 回答1: The problem is with calc(2 / 3) you will just get a number without an unit. CSS can't display just a number as width. This would be like if you set width: 3 which obviously doesn't work. If you want the percentage you

How to calculate percentages of sum of sub-arrays so that their sum is strictly 100 using C# decimal

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问题 Let's say I have an array of integers. Lets logically divide it into just two parts for simplification. Let's say total sum of all elements of array is 2860800 . Let's say sum of all elements of left half is 2834387 . Let's say sum of all elements of right half is 26413 . Now calculating left half's percentage by 100m * leftHalfSum / totalSum gives 99.07672678970917225950782998 . Similarly, right half's percentage by 100m * rightHalfSum / totalSum is 0.9232732102908277404921700224 . Now, if I

How to print the percentage of zipping a file python

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问题 I would like to get the percentage a file is at while zipping it. For instance it will print 1%, 2%, 3%, etc. I have no idea on where to start. How would I go about doing this right now I just have the code to zip the file. Code: zipPath = zipfile.ZipFile("Files/Zip/" + pic + ".zip", "w") for root, dirs, files in os.walk(filePath): for file in files: zipPath.write(os.path.join(root, file), str(pic) + "\\" + file) print("Done") zipPath.close() 回答1: Unfortunately, you can't get progress on the

Elegant way to generate a random value regarding percentage?

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问题 I have N values (integer). I'd like to know what is the most elegant way to randomly pick one of those values regarding a percentage. For example, for a 3 values example: Value 1 has 30% chance to get picked Value 2 has 12% chance to get picked Value 3 has 45% chance to get picked I need this for a program i'm developing with Java but a pseudo code algorithm or a code in any other language would be ok. 回答1: One way of doing this without calculating values to use is double d = Math.random() *

video.js size to fit div

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问题 I have a video in a div with a 40% width. In the html, width="100%" height="auto" makes the video disappear. Setting a specific size in pixels won't fit the div . Leaving the html blank leaves the video the wrong size and with black bars on the sides. I've tried the suggestions in most other posts, but can't seem to get it to work. <div id="box"><video id="trialvid" class="video-js vjs-default-skin" controls preload="auto" width="auto" height="auto" poster="images/reelthumbnail.jpg" data

c# progress bar percentage

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I have a progress bar in a winform c# application and I sue that as a progress indicator. The progress bar can have a different Maximum size depending on the amount of user input (which can go over 100) so this is how I set it up: this.pbLoadingWrite.Maximum = Input.Length; this.pbLoadingWrite.Step = 1; then just update the progress bar with: this.pbLoadingWrite.PerformStep(); All works fine but I would like to display a % number on top of the progress bar for better visibility. Since the Input.Length can be > 100, what's the syntax for displaying the percentage? Are there any helper functions

Normalize data by use of ratios based on a changing dataset in R

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问题 I am trying to normalize a Y scale by converting all values to percentages. Therefore, I need to divide every number in a column by the first number in that column. In Excel, this would be equivalent to locking a cell A1/$A1, B1/$A1, C1/$A1 then D1/$D1, E1/$D1... The data needs to first meet four criteria (Time, Treatment, Concentration and Type) and the reference value changes at every new treatment. Each treatment has 4 concentrations (0, 0.1, 2 and 50). I would like for the values