R/numdec.R

In admisc: Adrian Dusa's Miscellaneous

# Copyright (c) 2019 - 2023, Adrian Dusa
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`numdec` <- function(x, each = FALSE, na.rm = TRUE, maxdec = 15) {
    maxdec <- min(15, maxdec)
    pN <- possibleNumeric(x, each = TRUE)
    if (sum(na.omit(pN)) == 0) {
        stopError("'x' should contain at least one (possibly) numeric value.")
    }
    if (is.character(x)) {
        x <- asNumeric(x)
    }
    result <- rep(NA, length(x))
    wpN <- which(pN)
    x <- abs(x[wpN])
    x <- x - floor(x) 
    x <- sub("0\\.", "",
        sub("0+$", "", 
            format(x, scientific = FALSE, digits = max(7, maxdec))
        )
    )
    if (any(w9 <- grepl("999999", x))) {
        x[w9] <- sub(
            "0+", "1", 
            sub("(*)999999.*", "\\1", x[w9]) 
        )
    }
    if (any(w0 <- grepl("000000", x))) {
        x[w0] <- sub("(*)000000.*", "\\1", x[w0])
    }
    result[wpN] <- nchar(x)
    if (each) {
        return(pmin(result, maxdec))
    }
    return(min(maxdec, max(result, na.rm = na.rm)))
}