[R] conditional IF with AND

[rcoder]

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) <Ted.Harding at manchester.ac.uk>
> Fax-to-email: +44 (0)870 094 0861
> Date: 13-Aug-08                                       Time: 19:33:53
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