[R] find position

[Dimitris Rizopoulos]

try this:

which(a == 0.4)[1]


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
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Web: http://med.kuleuven.be/biostat/
      http://www.student.kuleuven.be/~m0390867/dimitris.htm


Quoting gallon li <gallon.li at gmail.com>:

> find the position of the first value who equals certain number in a vector:
>
> Say a=c(0,0,0,0,0.2, 0.2, 0.4,0.4,0.5)
>
> i wish to return the index value in a for which the value in the vector is
> equal to 0.4 for the first time. in this case, it is 7.
>
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