Compilers

An Introduction to R Software for Statistical Modelling & by Kuhnert&Venable

By Kuhnert&Venable

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Any operation on an NA results in an NA. na() function can be used to check for missing values in an object. number functions in a similar way as shown above. c CSIRO Australia, 2005 Course Materials and Exercises R and the Tinn-R Editor 38 These values come about usually from a division by zero or taking the log of zero. > value1 <- 5/0 > value2 <- log(0) > value3 <- 0/0 > cat("value1 = ",value1," " value2 = ",value2, value3 = ",value3,"\n") value1 = Inf value2 = -Inf value3 = NaN Arithmetic and Logical Operators The last few sections used a variety of arithmetic and logical operators to evaluate expressions.

Number functions in a similar way as shown above. c CSIRO Australia, 2005 Course Materials and Exercises R and the Tinn-R Editor 38 These values come about usually from a division by zero or taking the log of zero. > value1 <- 5/0 > value2 <- log(0) > value3 <- 0/0 > cat("value1 = ",value1," " value2 = ",value2, value3 = ",value3,"\n") value1 = Inf value2 = -Inf value3 = NaN Arithmetic and Logical Operators The last few sections used a variety of arithmetic and logical operators to evaluate expressions.

Each high-level plotting command starts plotting on a new figure. When all figures are exhausted, a new page is generated. The mfg graphics parameter keeps track of the row c CSIRO Australia, 2005 Course Materials and Exercises Graphics: An Introduction 64 and column of the current figure and the dimensions of the figure array. By setting this parameter unusual figure arrangements can be achieved. Other Graphics Parameters Some other useful graphics parameters include • ask=T: R asks before producing the graphic.

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