duplicates | 易学教程

Removing Duplicates in an array in C

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问题 The question is a little complex. The problem here is to get rid of duplicates and save the unique elements of array into another array with their original sequence. For example : If the input is entered b a c a d t The result should be : b a c d t in the exact state that the input entered. So, for sorting the array then checking couldn't work since I lost the original sequence. I was advised to use array of indices but I don't know how to do. So what is your advise to do that? For those who

removing duplicate units from data frame

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问题 I'm working on a large dataset with n covariates. Many of the rows are duplicates. In order to identify the duplicates I need to use a subset of the covariates to create an identification variable. That is, (n-x) covariates are irrelevant. I want to concatenate the values on the x covariates to uniquely identify the observations and eliminate the duplicates. set.seed(1234) UNIT <- c(1,1,1,1,2,2,2,3,3,3,4,4,4,5,6,6,6) DATE <- c("1/1/2010","1/1/2010","1/1/2010","1/2/2012","1/2/2009","1/2/2004",

Finding duplicate files via hashlib?

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问题 I know that this question has been asked before, and I've saw some of the answers, but this question is more about my code and the best way of accomplishing this task. I want to scan a directory and see if there are any duplicates (by checking MD5 hashes) in that directory. The following is my code: import sys import os import hashlib fileSliceLimitation = 5000000 #bytes # if the file is big, slice trick to avoid to load the whole file into RAM def getFileHashMD5(filename): retval = 0;

Eliminate duplicates in array (JSONiq)

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问题 I'd like to delete duplicates in a JSONiq array. let $x := [1, 2, 4 ,3, 3, 3, 1, 2, 5] How can I eliminate the duplicates in $x? 回答1: let $x := [1, 2, 4 ,3, 3, 3, 1, 2, 5] return [ distinct-values($x[]) ] 回答2: Use the replace function multiple times: replace($x, "([1-5])(.*)\1", "$1") Here's a fully functional JavaScript equivalent: [1,2,4,3,3,1,2,5].toString().replace(/([1-5]),(\1)/g, "$1").replace(/(,[1-5])(.*)(\1)/g,"$1$2").replace(/([1-5])(.*)(,\1)/g,"$1$2") Here is a generic JavaScript

Excel vba macro copy rows multiple times based on a cell integer value

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Prevent Duplicate SQL entries

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问题 I want to be able to prevent duplicate SQL text field rows. That is, if row 1 has the name field already defined as "John Smith", I don't want it to be able to add another "John Smith" (as common as that name might be). I tried checking if it existed at time of insertion, but the problem is, if you open up two browser windows at the same time and click submit simultaneously, they'll both check, the check will clear, and then they'll both insert if it's close enough together. Oh, and this is

SQL Server : find duplicates in a table based on values in a single column

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问题 I have a SQL Server table with the following fields and sample data: ID employeename 1 Jane 2 Peter 3 David 4 Jane 5 Peter 6 Jane The ID column has unique values for each row. The employeename column has duplicates. I want to be able to find duplicates based on the employeename column and list the ID s of the duplicates next to them separated by commas. Output expected for above sample data: employeename IDs Jane 1,4,6 Peter 2,5 There are other columns in the table that I do no want to

how do i insert multiple values in mysql and avoid duplicates

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问题 How would I insert multiple rows or values and avoid duplicates in the following schema. table schema is id,subject1,subject2,subject3 id is auto incremented. A duplicate would be where all subject1,subject2,subject3 already exist in a record in the exact same order. INSERT INTO "table_name" ("subject1","subject2","subject3") VALUES ("cats", "dogs", "hamsters") VALUES ("squirrels", "badgers", "minxes") VALUES ("moose", "deer", "ocelots") In the table let's say I already have a record for id

Duplicate TCP traffic with a proxy

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I need to send (duplicate) traffic from one machine (port) and to two different machines (ports). I need to take care of TCP session as well. In the beginnig I used em-proxy , but it seems to me that the overhead is quite large (it goes over 50% of cpu). Then I installed haproxy and I managed to redirect traffic (not to duplicate). The overhead is reasonable (less than 5%). The problem is that I could not say in haproxy config file the following: - listen on specific address:port and whatever you find send on the two different machines:ports and discard the answers from one of them. Em-proxy

Remove duplicate CSS declarations across multiple files

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I'm looking to remove duplicate CSS declarations from a number of files to make implementing changes easier. Is there a tool that can help me do that? Right now I'm faced with something like this: styles.css #content { width:800px; height:1000px; background: green; } styles.game.css #content { width:800px; height:1000px; background: blue; } And I want this: styles.css #content { width:800px; height:1000px; background: green; } styles.game.css #content { background: blue; } The total number of lines across all files is well over 10k, so techniques that rely on manual editing aren't an option. I