[R] subsetting

[sayan dasgupta]

try
 t <- subset(r, (r$time == "0h" & r$strain == "ROC"), select= c(time,strain,
gene, deltact)) 
Do ?"&" to understand the difference between  & and && . 



ANJAN PURKAYASTHA wrote:
> 
> Hi,
> I have a data-frame,  r (column names below), that needs subsetting:
> date, time, strain, gene, deltact
> 
> When I try to subset r by applying selection criteria on two columns I get
> an empty data frame. For example I would like to extract all rows that
> have
> time == 0h and strain == ROC.
> So, t <- subset(r, (r$time == "0h" && r$strain == "ROC"), select= c(time,
> strain, gene, deltact)) returns an empty data-frame.
> Is it not possible to subset based on two criteria?
> TIA
> Anjan
> 
> -- 
> ===================================
> anjan purkayastha, phd.
> research associate
> fas center for systems biology,
> harvard university
> 52 oxford street
> cambridge ma
> phone-703.740.6939
> ===================================
> 
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> 
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