Thank you all for your replies. This is all very useful information for me!
Ted, thank you very much for the extra explanation and example. Many thanks, rcoder Ted.Harding-2 wrote: > > On 13-Aug-08 16:45:27, rcoder wrote: >> Hi everyone, >> I'm trying to create an "if" conditional statement with two conditions, >> whereby the statement is true when condition 1 AND condition 2 are met: >> >> code structure: >> if ?AND? (a[x,y] <condition1>, a[x,y] <condition2>) >> >> I've trawled through the help files, but I cannot find an example of >> the syntax for incorporating an AND in a conditional IF statement. >> >> Thanks, >> rcoder > > The basic structure of an 'if' statement (from ?"if" -- don't > forget the ".." for certain keywords such as "if") is: > > if(cond) expr > > What is not explained in the ?"if" help is that 'cond' may > be any expression that evaluates to a logical TRUE or FALSE. > > Hence you can build 'cond' to suit your purpose. Therefore: > > if( (<condition 1 on a[x,y]>)&(<condition 2 on a[x,y]>) ) { > <whatever you want to do if (cond1 AND cond2 ) is TRUE> > } > > Example: > > if( (a[x,y]>1.0)&(a[x,y]<2.0) ){ > print("Between 1 and 2") > } > > Hoping this helps, > Ted. > > -------------------------------------------------------------------- > E-Mail: (Ted Harding) <[EMAIL PROTECTED]> > Fax-to-email: +44 (0)870 094 0861 > Date: 13-Aug-08 Time: 19:33:53 > ------------------------------ XFMail ------------------------------ > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > > -- View this message in context: http://www.nabble.com/conditional-IF-with-AND-tp18966890p18970101.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.