On 2011-02-17 07:36, Maas James Dr (MED) wrote:

I'm using the range command to get the minimum and maximum values of an array 
as in

x<- range(array_y)

which gives me two values such as

[1] -2 9

I need to be able to test if this range of values includes a third value.  For 
example I'd like to query

1) does the range of -2 to 9 include 3, answer TRUE
2) does the range of -2 to 9 include -6, answer FALSE?

All values could be negative or positive.  Is there a R function that will test 
this or do I need to programme it?  I have searched but not found one.

Here too you can use findInterval():

  findInterval( -2, range(array_y) ) == 1

You may want to set the 'rightmost.closed' argument to TRUE.

Peter Ehlers


Thanks

J

===============================
Dr. Jim Maas
University of East Anglia

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