as.mixdata.r

这个包里面含有利用极大似然估计方法来拟合成组数据和条件数据的有限混合分布模型的函数

## last modified 23 Oct 2002 by J. Du

as.mixdata <- function (x) 
{
    if (is.data.frame(x) | is.matrix(x)) {
        k <- nrow(x)
        m <- ncol(x)
        if (sum(is.na(x[, -1])) == 0 & sum(is.infinite(x[, -1])) == 
            0) 
            if (sum(x[, -1] < 0) == 0) {
                if (is.na(x[k, 1])) 
                  x[k, 1] <- Inf
                if (sum(is.na(x[-k, 1])) == 0 & sum(is.infinite(x[-k, 
                  1])) == 0 & sum(x[-k, 1] - x[-1, 1] >= 0) == 
                  0) {
                  if (!(is.na(x[k, 1]) | is.infinite(x[k, 1])) & 
                    is.numeric(x[k, 1])) {
                    x[k + 1, 1] <- Inf
                    x[k + 1, 2:m] <- 0
                  }
                  class(x) <- c("mixdata", "data.frame")
                }
            }
    }
    if (sum(!is.na(match(class(x), "mixdata"))) == 0) 
        NULL
    else x
}