R help - Aug 2008 - conditional IF with AND

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
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if(cond1 && cond2) {
   ...
}


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

See:

?`&`


On Wed, Aug 13, 2008 at 1:45 PM, rcoder <mpdotbook at gmail.com>
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
> --
> View this message in context:
http://www.nabble.com/conditional-IF-with-AND-tp18966890p18966890.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> R-help at 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.
>


-- 
Henrique Dallazuanna
Curitiba-Paran?-Brasil
25? 25' 40" S 49? 16' 22" O

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.

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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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