R/dlnormMixAlt.R

In EnvStats: Package for Environmental Statistics, Including US EPA Guidance

dlnormMixAlt <-
function (x, mean1 = exp(1/2), cv1 = sqrt(exp(1) - 1), mean2 = exp(1/2),
    cv2 = sqrt(exp(1) - 1), p.mix = 0.5)
{
    names.x <- names(x)
    arg.mat <- cbind.no.warn(x = as.vector(x), mean1 = as.vector(mean1),
        cv1 = as.vector(cv1), mean2 = as.vector(mean2), cv2 = as.vector(cv2),
        p.mix = as.vector(p.mix))
    for (i in c("x", "mean1", "cv1", "mean2", "cv2", "p.mix")) assign(i,
        arg.mat[, i])
    na.index <- is_na_matrix(arg.mat)
    if (all(na.index))
        y <- rep(NA, length(x))
    else {
        if (any(c(mean1[!na.index], mean2[!na.index], cv1[!na.index],
            cv2[!na.index]) < .Machine$double.eps))
            stop("All values of 'mean1', 'mean2', 'cv1', and 'cv2' must be positive.")
        if (any(p.mix[!na.index] < 0 | p.mix[!na.index] > 1))
            stop("All values of 'p.mix' must be between 0 and 1.")
        y <- (1 - p.mix) * dlnormAlt(x, mean1, cv1) + p.mix *
            dlnormAlt(x, mean2, cv2)
    }
    if (!is.null(names.x))
        names(y) <- rep(names.x, length = length(y))
    else names(y) <- NULL
    y
}