grepl

问题 Sample of dataset: diag01 <- as.factor(c("S7211","J47","J47","K729","M2445","Z509","Z488","R13","L893","N318","L0311","S510","A047","D649")) diag02 <- as.factor(c("K590","D761","J961","T501","M8580","R268","T831","G8240","B9688","G550","E162","T8902","E86","I849")) diag03 <- as.factor(c("F058","M0820","E877","E86","G712","R32","A408","E888","G8220","C794","T68","L0310","M1094","D469")) diag04 <- as.factor(c("E86","C845","R790","I420","G4732","R600","L893","R509","T913","C795","M8412","G8212",

问题 I have a single long string variable with 3 obs. I was trying to create a field prob to extract the specific string from the long string. the code and message is below. data aa: "The probability of being a carrier is 0.0002422359 " " an BRCA1 carrier 0.0001061067 " " an BRCA2 carrier 0.00013612 " enter code here aa$prob <- ifelse(grepl("The probability of being a carrier is", xx)==TRUE, word(aa, 8, 8), ifelse(grepl("BRCA", xx)==TRUE, word(aa, 5, 5), NA)) Warning message: In aa$prob <- ifelse

问题 I have a single long string variable with 3 obs. I was trying to create a field prob to extract the specific string from the long string. the code and message is below. data aa: "The probability of being a carrier is 0.0002422359 " " an BRCA1 carrier 0.0001061067 " " an BRCA2 carrier 0.00013612 " enter code here aa$prob <- ifelse(grepl("The probability of being a carrier is", xx)==TRUE, word(aa, 8, 8), ifelse(grepl("BRCA", xx)==TRUE, word(aa, 5, 5), NA)) Warning message: In aa$prob <- ifelse

问题 I have a column of 50k rows of tweets named text from a csv file (the tweets consists of sentences, phrases etc). I'm trying to count frequency of several words in that column. Is there an easier way to do it vs what I'm doing below? # Reading my file tweets <- read.csv('coffee.csv', header=TRUE) # Doing a grepl per word (This is hard because I need to look for many words one by one) coffee <- grepl("coffee", text$tweets, ignore.case=TRUE) mugs <- grepl("mugs", text$tweets, ignore.case=TRUE)

问题 I have a column of 50k rows of tweets named text from a csv file (the tweets consists of sentences, phrases etc). I'm trying to count frequency of several words in that column. Is there an easier way to do it vs what I'm doing below? # Reading my file tweets <- read.csv('coffee.csv', header=TRUE) # Doing a grepl per word (This is hard because I need to look for many words one by one) coffee <- grepl("coffee", text$tweets, ignore.case=TRUE) mugs <- grepl("mugs", text$tweets, ignore.case=TRUE)

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 1 year ago . Improve this question I'm starting to do a lot of string matching in my work and I'm curious as to what the differences between the three functions are, and in what situations someone would use one over the other. 回答1: stringr is a "A consistent, simple and easy to use set of

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 1 year ago . Improve this question I'm starting to do a lot of string matching in my work and I'm curious as to what the differences between the three functions are, and in what situations someone would use one over the other. 回答1: stringr is a "A consistent, simple and easy to use set of

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 1 year ago . Improve this question I'm starting to do a lot of string matching in my work and I'm curious as to what the differences between the three functions are, and in what situations someone would use one over the other. 回答1: stringr is a "A consistent, simple and easy to use set of

问题 I am checking if a string contains any special characters. This is what I have, and its not working, if(grepl('^\\[:punct:]', val)) So if anybody can tell me what I am missing, that will be helpful. Special characters ~ ` ! @# $ % ^ & * | : ; , ." | 回答1: As @thelatemail pointed out in the comments you can use: grepl('[^[:punct:]]', val) which will result in TRUE or FALSE for each value in your vector. You can add sum() to the beginning of the statement to get the total number of these cases.

问题 I am checking if a string contains any special characters. This is what I have, and its not working, if(grepl('^\\[:punct:]', val)) So if anybody can tell me what I am missing, that will be helpful. Special characters ~ ` ! @# $ % ^ & * | : ; , ." | 回答1: As @thelatemail pointed out in the comments you can use: grepl('[^[:punct:]]', val) which will result in TRUE or FALSE for each value in your vector. You can add sum() to the beginning of the statement to get the total number of these cases.