[R] Automatic routine - help

Gabor Grothendieck
Wed, 23 Jun 2004 16:10:14 -0000

You already have a few solutions but here is one more:

   (z >= 0 & z <= 1) * z + (z > 1)

It uses the fact that TRUE and FALSE act as 1 and 0 in arithmetic.

Slightly shorter but trickier is:

   (z*z <= z) * z + (z > 1)

which uses the fact that z*z <= z only in the interval [0,1] .

Monica Palaseanu-Lovejoy <monica.palaseanu-lovejoy <at>
stud.man.ac.uk> writes:

:
: Hi,
:
: I would like to write a little automatic routine in R, but i am a too
: much of a beginner for that. I will appreciate any help regarding this
: particular problem.
:
: Let伮抯 suppose I have a data.frame with j columns (from 1 to n) and i
: rows (from 1 to p). I would like to write a procedure which reads
: every column j (j from 1 to n) and compare each value with the
: interval [0,1]. If z(i,j) is less than 0, then replace z(i,j) with 0. If z
(i,j)
: is greater than 1, then replace z(i,j) with 1. If z(i,j) is inside the
: interval [0,1] then don伮抰 change. In the end I would like to have a
: new data.frame with the new values.
:
: I am not sure how complicated or long such a procedure might be,
: so I will be very grateful for any help.
:
: Thank you in advance,
:
: Monica
:
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