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Tutorial how to use R
When you quit R program you can save the workspace so that all objects created during the current session are available next time you work with R. ls() #to list all objects stored in the current workspace. rm(x) #to remove object x from workspace. matrix1 # to list the content of …
r dataframe column types

[DOCX File]Lab 2: Manipulating Dataframes - SAGE Publications Inc
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The “dataframe” is one of the most essential data structures used in R. It is conceptually equivalent to a database “relation” and to the typical rectangular dataset with variables as columns and cases as rows. For this activity, you will gain some skill with manipulating a dataframe.
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University of Washington
John Miyamoto, Version 3/26/2013. This list was current on 4/5/2013. After this date, the current list is maintained in '\r\rdoc\funlist.htm'. To load this file into Word, use the
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[DOC File]R notes for BIOL 7083, Community Ecology, Fall 2003
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R makes use of “NA” to indicate a blank or missing value, so before reading in a data set with blanks or missing values, replace each blank or missing value with “NA” (not including the quotes). Note that for many R functions to work properly with a data set with missing values, the argument na.rm=T must be included, e.g.: > mean(x, na ...
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[DOC File]Assignment 1: Introduction to R - University of Idaho
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Assignment 1: Introduction to R. This assignment is an opportunity to try the R statistical package and to start to learn some of its behaviors and options. Text like this will be general comments. Text like this will be my commands to R, the R prompt is a "greater than" …
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[DOC File]R code from chapter 8 of the book - Horvath Lab UCLA
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the SFT index R^2 (y-axis) as a function of different powers beta (x-axis). While R^2 tends to go up with higher powers, there is not a strictly monotonic relationship. Right hand side: the mean connectivity (y-axis) is a strictly decreasing function of the power beta (x-axis). The result is shown in the Figure.
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[DOC File]Using R version 2 - University of Colorado Boulder
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, you will see the created dataset, a matrix of data with the two variables defining the columns and the five rows defined by the five individual people on whom we have measured these two variables. The other way to enter data is to put them into an Excel spreadsheet that you then save as a .txt file and then you can directly import this into R.
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[DOCX File]Summarising categorical variables in R
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R needs to know which variables are categorical variables and the labels for each value which can be specified using the factor command. variable
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[DOCX File]BASICS OF R - University of South Carolina
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R is an “object oriented” interactive language. I am sure all the CSCE majors reading this can give me a better definition of the term “object oriented” (and I hope you will), but in my non-CSCE way of thinking it means that data in R are organized into specific structures called “objects”, of different types, and these objects share similar qualities, or “attributes”.
r dataframe column types

[DOCX File]R arithmetic operations - Boston University
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Return the number of rows or columns of vector, matrix or dataframe. row.names Retrieve or set the names of the rows . R script file. R script is usually saved in a file with extension .R (or .r). # - serves as a comment indicator (every character on the line after #-sign is ignored.
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R list columns of dataframe