R Codes at TU München

Flashcards and summaries for R Codes at the TU München

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show_query()

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test <- collect(abc)

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collapse()

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copy_to()

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src_mysql(user=’…’, password=’…’, dbname=’…’, host=’…’)

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src_tbls()    

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tbl()    

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dbDisconnect()

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memory.limit()    

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fitted(m2)[1:2]

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gpairs(sat.df) from package(‘gpairs’)

Exemplary flashcards for R Codes at the TU München on StudySmarter:

  1. gives the 5th element of x
  2. gives elements 6 7 8 9 of the vector
  3. gives the second and fifth element of the vector    

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Exemplary flashcards for R Codes at the TU München on StudySmarter:

R Codes

show_query()
one can see the the SQL that dplyr will run (SELECT, FROM, WHERE)

R Codes

test <- collect(abc)
dplyr is forced to retrieve all results from DBMS into R returned as a data frame

R Codes

collapse()

forces execution in DBMS, turns queries into table expression, remaining queries are run against the table described in the collapsed expression

R Codes

copy_to()

creates a table in the database from a local data frame

R Codes

src_mysql(user=’…’, password=’…’, dbname=’…’, host=’…’)
establish connection to the database

R Codes

src_tbls()    
source table from DB

R Codes

tbl()    
table Data form DB

R Codes

dbDisconnect()
disconnect from DB

R Codes

memory.limit()    
check memory limit set by the operating system, windows specific

R Codes

fitted(m2)[1:2]
stores the predictions for observations used to estimate the model… i.e. what would have been the overall satisfaction with the inputs of row 1:2 according to the model

R Codes

gpairs(sat.df) from package(‘gpairs’)
checks all variables for normal distribution <> sat.df$distance with highly skewed distribution

R Codes

  1. gives the 5th element of x
  2. gives elements 6 7 8 9 of the vector
  3. gives the second and fifth element of the vector    
x[5]: gives the 5th element of x x[6:9]: gives elements 6 7 8 9 of the vector
x[c(2,5)]: gives the second and fifth element of the vector

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