Error(s) in re-building vignettes:
  ...
--- re-building 'vignetteUmom.Rnw' using Sweave
 ----------- FAILURE REPORT -------------- 
 --- failure: the condition has length > 1 ---
 --- srcref --- 
: 
 --- package (from environment) --- 
Umoments
 --- call from context --- 
all_groups(powvect)
 --- call from argument --- 
if (class(mat) != "matrix") mat <- matrix(mat, nrow = 1)
 --- R stacktrace ---
where 1: all_groups(powvect)
where 2: one_combination(c(5, 0, 2, 1), "n_x")
where 3: eval(expr, .GlobalEnv)
where 4: eval(expr, .GlobalEnv)
where 5: withVisible(eval(expr, .GlobalEnv))
where 6: doTryCatch(return(expr), name, parentenv, handler)
where 7: tryCatchOne(expr, names, parentenv, handlers[[1L]])
where 8: tryCatchList(expr, classes, parentenv, handlers)
where 9: tryCatch(expr, error = function(e) {
    call <- conditionCall(e)
    if (!is.null(call)) {
        if (identical(call[[1L]], quote(doTryCatch))) 
            call <- sys.call(-4L)
        dcall <- deparse(call)[1L]
        prefix <- paste("Error in", dcall, ": ")
        LONG <- 75L
        sm <- strsplit(conditionMessage(e), "\n")[[1L]]
        w <- 14L + nchar(dcall, type = "w") + nchar(sm[1L], type = "w")
        if (is.na(w)) 
            w <- 14L + nchar(dcall, type = "b") + nchar(sm[1L], 
                type = "b")
        if (w > LONG) 
            prefix <- paste0(prefix, "\n  ")
    }
    else prefix <- "Error : "
    msg <- paste0(prefix, conditionMessage(e), "\n")
    .Internal(seterrmessage(msg[1L]))
    if (!silent && isTRUE(getOption("show.error.messages"))) {
        cat(msg, file = outFile)
        .Internal(printDeferredWarnings())
    }
    invisible(structure(msg, class = "try-error", condition = e))
})
where 10: try(withVisible(eval(expr, .GlobalEnv)), silent = TRUE)
where 11: evalFunc(ce, options)
where 12: tryCatchList(expr, classes, parentenv, handlers)
where 13: tryCatch(evalFunc(ce, options), finally = {
    cat("\n")
    sink()
})
where 14: driver$runcode(drobj, chunk, chunkopts)
where 15: utils::Sweave(...)
where 16: engine$weave(file, quiet = quiet, encoding = enc)
where 17: doTryCatch(return(expr), name, parentenv, handler)
where 18: tryCatchOne(expr, names, parentenv, handlers[[1L]])
where 19: tryCatchList(expr, classes, parentenv, handlers)
where 20: tryCatch({
    engine$weave(file, quiet = quiet, encoding = enc)
    setwd(startdir)
    output <- find_vignette_product(name, by = "weave", engine = engine)
    if (!have.makefile && vignette_is_tex(output)) {
        texi2pdf(file = output, clean = FALSE, quiet = quiet)
        output <- find_vignette_product(name, by = "texi2pdf", 
            engine = engine)
    }
    outputs <- c(outputs, output)
}, error = function(e) {
    thisOK <<- FALSE
    fails <<- c(fails, file)
    message(gettextf("Error: processing vignette '%s' failed with diagnostics:\n%s", 
        file, conditionMessage(e)))
})
where 21: tools:::buildVignettes(dir = "/home/hornik/tmp/R.check/r-devel-clang/Work/PKGS/Umoments.Rcheck/vign_test/Umoments", 
    ser_elibs = "/tmp/Rtmpavn9hs/file786850beccc5.rds")

 --- value of length: 2 type: logical ---
[1] FALSE  TRUE
 --- function from context --- 
function (powvect) 
{
    K <- length(powvect)
    m <- sum(powvect)
    groupings <- groups(m)
    perms <- perm_categories(powvect)
    excl <- paste("[^", letters[1:K], "]", sep = "")
    mat <- matrix("", ncol = m + 2)
    for (g in 1:length(groupings)) {
        grp <- groupings[[g]]
        for (p in 1:length(perms)) {
            permgroup <- substring(perms[p], c(1, cumsum(grp[-length(grp)]) + 
                1), cumsum(grp))
            if (any(permgroup == "a")) 
                next
            newrow <- sort(sapply(permgroup, sort_str))
            mat <- rbind(mat, c(newrow, rep("", m - length(newrow)), 
                length(newrow), calculate_coef(newrow, K, excl)))
        }
    }
    all_empty <- apply(mat, 2, function(s) all(s == ""))
    mat <- unique(mat[, !all_empty])[-1, ]
    if (class(mat) != "matrix") 
        mat <- matrix(mat, nrow = 1)
    colnames(mat) <- c(paste("group", 1:(ncol(mat) - 2)), "d", 
        "coef")
    return(mat)
}
<bytecode: 0x2a33bf8>
<environment: namespace:Umoments>
 --- function search by body ---
Function all_groups in namespace Umoments has this body.
 ----------- END OF FAILURE REPORT -------------- 

Error: processing vignette 'vignetteUmom.Rnw' failed with diagnostics:
 chunk 7 
Error in if (class(mat) != "matrix") mat <- matrix(mat, nrow = 1) : 
  the condition has length > 1

--- failed re-building 'vignetteUmom.Rnw'

SUMMARY: processing the following file failed:
  'vignetteUmom.Rnw'

Error: Vignette re-building failed.
Execution halted