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20 janv. 2016 · Think about this: OP might still call "e" Euler's constant right now, just because nobody here want to tell him the difference of terms or everybody here just don't care. Sorry I was math major in college so maybe that's why I am little more sensitive to the so called "terminology". I know stack overflow is a place for solving practical issues, but I am still surprised that how different ...
22 févr. 2012 · If the numbers in your vector are varying lengths, make sure to use justified = "none" or else there will be spaces padding them to the same length. format(1e6, scientific=FALSE) returns "1000000" while as.character(1e6) returns "1e+06", so there is a difference between the two methods.
5 juil. 2011 · CommentedJun 23, 2021 at 10:44. 18. For a Entity Relationship Diagram using Oracle SQL Developer: File → Data Modeler → Import → Data Dictionary → Select database connection → Next → Select schema/database (Check All Selected) → Next → Select object to import (if All Selected was not checked) → Next → Finish.
6 janv. 2016 · A little history. The /r stands for return or carriage return which owes its history to the typewriter. A carriage return moved your carriage all the way to the right so you were typing at the start of the line. The /n stands for new line, again, from typewriter days you moved down to a new line.
handling special characters e.g. accents in R. Ask Question Asked 12 years, 7 months ago. Modified 6 years, 3 months ago. Viewed 53k times Part of R Language Collec ...
This is easy to understand if you imagine a typewriter in front of you: \n - rotates the typewriter one line down \r - returns a carriage, i.e. moves the typewriter roller or printer printhead so that the next character is at the beginning of the line instead of at the end. –
Data <- subset( Data, select = -a ) and to remove the b and d columns you could do. Data <- subset( Data, select = -c(d, b ) ) You can remove all columns between d and b with: Data <- subset( Data, select = -c( d : b ) As I said above, this syntax works only when the column names are known.
25 nov. 2014 · 2. %>% is the pipe operator from magrittr, widely used in other Tidyverse and compatible packages. The basic way to understand it is it takes the left-hand side (LHS) and turns it into the first argument of the right-hand side (RHS). x %>% f(y) is special syntax that is essentially f(x,y).
26 août 2011 · @naught101 I wouldn't consider it unusual by R's standards. Vector recycling is a common property of R functions. Keep in mind that 'blah' is a vector of length 1. The recycling property makes it easy to do something like paste0("blah", 1:3) to get "blah1" "blah2" "blah3". –
Careful here if your data is not all of the same type. Passing through a matrix means that all data will be coerced into a common type. I.e. if you have one column of character data and one column of numeric data the numeric data will be coerced to string by matrix() and then both to factor by data.frame(). –
