Marc, I see. Thanks. Xiaohua On 7/12/05, Marc Schwartz (via MN) <[EMAIL PROTECTED]> wrote: > > On Tue, 2005-07-12 at 16:22 +0200, ecoinfo wrote: > > Hi R users, > > Maybe the question is too simple. > > In a IF ... ELSE ... statement "if(cond) cons.expr else alt.expr", IF > and > > ELSE should be at the same line? > > For example, > > if (x1==12) > > { > > y1 <- 5 > > }else > > { > > y1 <- 3 > > } > > is right, while > > if (x1==12) > > { > > y1 <- 5 > > } > > else # Error: syntax error > > { > > y1 <- 3 > > } > > is wrong? > > Thanks > > Note the following from the Details section of ?"if" > > "Note that it is a common mistake to forget to put braces ({ .. }) > around your statements, e.g., after if(..) or for(....). In particular, > you should not have a newline between } and else to avoid a syntax error > in entering a if ... else construct at the keyboard or via source. For > that reason, one (somewhat extreme) attitude of defensive programming is > to always use braces, e.g., for if clauses." > > > One other approach is the following: > > if (x1 == 12) > { > y1 <- 5 > } else { > y1 <- 3 > } > > Note the presence of both braces on the 'else' line. > > HTH, > > Marc Schwartz > > >
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