[R] Matching/checking for occurence when values are double?

[Jorge Cimentada]

Matching 100 to 100.0 or 100.00 or whatever N number of decimales will
always return a TRUE.

The expression your using is correct. A more complete expression would be
kidmomiq[100 == kidmomiq$mom_iq, ].



On Fri, Sep 9, 2016 at 2:01 PM, Matti Viljamaa <mviljamaa at kapsi.fi> wrote:

I need to pick from a dataset those rows that have a double value set to
> 100.
> However since the values in this column are like the following:
>
> [1] 121.11750  89.36188 115.44320  99.44964  92.74571 107.90180
> [7] 138.89310 125.14510  81.61953  95.07307  88.57700  94.85971
> [13]  88.96280 114.11430 100.53410 120.41910 114.42690
> …
>
> Then can I match against 100 or 100.0? Or do I need to match against
> 100.00000 or something else?
>
> E.g. does
>
> 100.0 %in% kidmomiq$mom_iq
>
> produce a truthful match result with this kind of data (I’m getting 0
> occurrences, which might be correct, but I’m not sure)?
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> 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.

	[[alternative HTML version deleted]]