[R] How to pass value to an argument in a function which is an argument to the main function

[David Winsemius]

On May 7, 2010, at 3:30 PM, Jun Shen wrote:

> Dear all,
>
> I constructed this function called my.boxplot.stats by replacing  
> fivnum()
> with quantile() in function boxplot.stats(). So I can try different  
> quantile
> methods in bwplot(). The problem is I couldn't pass different values  
> to the
> "type" argument to my.boxplot.stats, which in turn is an argument in
> bwplot(). Now I just have to manually change the "type" value in
> my.boxplot.stats. What I would like to do is call bwplot() like
>
> bwplot(CL~DOSE,data=patab,stats=my.boxplot.stats(type=7)),
>

You have defined a function with an argument of x that does not have a  
default value, so it throws an error when you call it with no value  
for x. (It's not complaining about the type argument.)

-- 
David.


> But I got an error:
> Error in my.boxplot.stats(type = 7) : element 1 is empty;
>   the part of the args list of 'is.na' being evaluated was:
>   (x)
>
> Thanks a lot.
>
> Jun Shen from Millipore Corporation
>
> ========================================================
> my.boxplot.stats<-function (x, coef = 1.5, *type=6*, do.conf = TRUE,  
> do.out
> = TRUE)
> {
>    if (coef < 0)
>        stop("'coef' must not be negative")
>    nna <- !is.na(x)
>    n <- sum(nna)
>    stats <- stats::quantile(x, type=type,na.rm = TRUE)
>    iqr <- diff(stats[c(2, 4)])
>    if (coef == 0)
>        do.out <- FALSE
>    else {
>        out <- if (!is.na(iqr)) {
>            x < (stats[2L] - coef * iqr) | x > (stats[4L] + coef *
>                iqr)
>        }
>        else !is.finite(x)
>        if (any(out[nna], na.rm = TRUE))
>            stats[c(1, 5)] <- range(x[!out], na.rm = TRUE)
>    }
>    conf <- if (do.conf)
>        stats[3L] + c(-1.58, 1.58) * iqr/sqrt(n)
>    list(stats = stats, n = n, conf = conf, out = if (do.out) x[out &
>        nna] else numeric(0L))
> }
>
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>
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David Winsemius, MD
West Hartford, CT