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[PDF File]Character vectors
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Character/string – each element in the vector is a string of one or more characters. Built in character vectors are letters and LETTERS which provide the 26 lower (and upper) case letters, respecitively. > y = c("a", "bc", "def") > length(y) [1] 3 > nchar(y) [1] 1 2 3 > y == "a" [1] TRUE FALSE FALSE > y == "b" [1] FALSE FALSE FALSE – Typeset by FoilTEX – 2 Factor A factor- type vector ...
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[PDF File]Syntax Becomes - RStudio
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2014-10-30 · chunk if its dependencies change. Animation anipots 'controls,loop' Extra options for animations (see the animate package). interval 1 The number of seconds to pause between animation frames. Plots dev 'png' The R function name that will be used as a graphical device to record plots, e.g. dev='CairoPDF'. dev.args NULL Arguments to be passed to the device, e.g. dev.args=list(bg='yellow ...
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[PDF File]R Data Import/Export
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This manual was first written in 2000, and the number of scope of R packages has increased a hundredfold since. For specialist data formats it is worth searching to see if a suitable package already exists. 1.1 Imports The easiest form of data to import into R is a simple text file, and this will often be acceptable for problems of small or medium scale. The primary function to import from a ...
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[PDF File]Work with strings with stringr : : CHEAT SHEET
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str_count(string, pattern) Count the number of matches in a string. str_count(fruit, "a") str_locate(string, pattern) Locate the positions of pattern matches in a string. Also str_locate_all. str_locate(fruit, "a") Manage Lengths TRUE TRUE FALSE TRUE 1 2 4 0 3 1 2 start end 2 4 4 7 NA NA 3 4 str_length(string) The width of strings (i.e. number of code points, which generally equals the number ...
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[PDF File]String manipulation with stringr : : CHEAT SHEET
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positions of pattern matches in a string. Also str_locate_all(). str_locate(fruit, "a") str_count(string, pattern) Count the number of matches in a string. str_count(fruit, "a") Manage Lengths TRUE TRUE FALSE TRUE 1 2 4 0 3 1 2 start end 2 4 4 7 NA 3 4 str_length(string) The width of strings (i.e. number of code points, which generally equals
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[PDF File]Working with Time Series Data in R - University of Washington
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number of seconds since the beginning of 1970 as a numeric vector. Does not control for time zones. ... Date objects from a character string representing a date using the as.Date() function. The default format is “YYYY/m/d” or “YYYY-m-d””, where YYYY represents the four digit year, m represents the month digit and d represents the day digit. For example, > my.date = as.Date("1970/1/1 ...
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[PDF File]Overview of Coordinate Reference Systems (CRS) in R
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In R, the notation used to describe the CRS is proj4string from the PROJ.4 library. It looks like this: +init=epsg:4121 +proj=longlat +ellps=GRS80 +datum=GGRS87 +no_defs +towgs84=-199.87,74.79,246.62 There are various attributes of the CRS, such as the projection, datum, and ellipsoid. Some of the options for each variable can be obtained in R with projInfo: 1. Projection: projInfo(type ...
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[PDF File]Quick tricks for sequential string or character names.
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Quick tricks for sequential string or character names. Dr. Jon Starkweather, Research and Statistical Support consultant. This month’s article is just a short piece which may be very useful when working with large data sets. The article offers tips for naming objects which contain a large number of elements. The primary reason for this article is the ability to create a sequential character ...
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[PDF File]encode — Encode string into numeric and vice versa
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The maximum number of associations within each value label is 65,536. Each association in a value label maps a string of up to 32,000 bytes to a number. For plain ASCII text, the number of bytes is equal to the number of characters. If your string has other Unicode characters, the number of bytes is greater than the number of characters.
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[PDF File]To Enter Raw Data into R - Rossman/Chance
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To change any of the data values, you can then use > data.entry(variablename) (you can list any number of variable names here). If you click on the name in the Data Editor window, you can change the variable mode from numeric to character and vice versa. You must close the Data Entry window before you can enter new commands in the R Console. Alternatively, you can enter the data in Excel ...
r convert character to number

R change string to number