Togaware DATA MINING
Desktop Survival Guide
by Graham Williams
Google

If Statement



> if (!file.exists("mydata.RData")) 
  { write(myiris, file="mydata.RData") }

The body of the if statement is a single statement (so in the above example the curly brackets are not necessary). The curly brackets are used to collect a number of statements into a single compound statement as the body for the if.



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