Error(s) in re-building vignettes:
  ...
--- re-building ‘skyscapeR.Rmd’ using knitr
 ----------- FAILURE REPORT -------------- 
 --- failure: the condition has length > 1 ---
 --- srcref --- 
: 
 --- package (from environment) --- 
skyscapeR
 --- call from context --- 
reduct.compass(loc = georef, mag.az = azimuths, date = "2017/06/13", 
    alt = altitudes)
 --- call from argument --- 
if (class(loc) == "skyscapeR.horizon") {
    hor <- loc
    loc <- loc$georef
} else {
    hor <- NULL
}
 --- R stacktrace ---
where 1: reduct.compass(loc = georef, mag.az = azimuths, date = "2017/06/13", 
    alt = altitudes)
where 2: eval(expr, envir, enclos)
where 3: eval(expr, envir, enclos)
where 4: withVisible(eval(expr, envir, enclos))
where 5: withCallingHandlers(withVisible(eval(expr, envir, enclos)), warning = wHandler, 
    error = eHandler, message = mHandler)
where 6: handle(ev <- withCallingHandlers(withVisible(eval(expr, envir, 
    enclos)), warning = wHandler, error = eHandler, message = mHandler))
where 7: timing_fn(handle(ev <- withCallingHandlers(withVisible(eval(expr, 
    envir, enclos)), warning = wHandler, error = eHandler, message = mHandler)))
where 8: evaluate_call(expr, parsed$src[[i]], envir = envir, enclos = enclos, 
    debug = debug, last = i == length(out), use_try = stop_on_error != 
        2L, keep_warning = keep_warning, keep_message = keep_message, 
    output_handler = output_handler, include_timing = include_timing)
where 9: evaluate::evaluate(...)
where 10: evaluate(code, envir = env, new_device = FALSE, keep_warning = !isFALSE(options$warning), 
    keep_message = !isFALSE(options$message), stop_on_error = if (options$error && 
        options$include) 0L else 2L, output_handler = knit_handlers(options$render, 
        options))
where 11: in_dir(input_dir(), evaluate(code, envir = env, new_device = FALSE, 
    keep_warning = !isFALSE(options$warning), keep_message = !isFALSE(options$message), 
    stop_on_error = if (options$error && options$include) 0L else 2L, 
    output_handler = knit_handlers(options$render, options)))
where 12: block_exec(params)
where 13: call_block(x)
where 14: process_group.block(group)
where 15: process_group(group)
where 16: withCallingHandlers(if (tangle) process_tangle(group) else process_group(group), 
    error = function(e) {
        setwd(wd)
        cat(res, sep = "\n", file = output %n% "")
        message("Quitting from lines ", paste(current_lines(i), 
            collapse = "-"), " (", knit_concord$get("infile"), 
            ") ")
    })
where 17: process_file(text, output)
where 18: knit(input, text = text, envir = envir, quiet = quiet)
where 19: knit2html(..., force_v1 = TRUE)
where 20: (if (grepl("\\.[Rr]md$", file)) knit2html_v1 else if (grepl("\\.[Rr]rst$", 
    file)) knit2pandoc else knit)(file, encoding = encoding, 
    quiet = quiet, envir = globalenv(), ...)
where 21: engine$weave(file, quiet = quiet, encoding = enc)
where 22: doTryCatch(return(expr), name, parentenv, handler)
where 23: tryCatchOne(expr, names, parentenv, handlers[[1L]])
where 24: tryCatchList(expr, classes, parentenv, handlers)
where 25: 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 26: tools:::buildVignettes(dir = "/home/hornik/tmp/R.check/r-devel-gcc/Work/PKGS/skyscapeR.Rcheck/vign_test/skyscapeR", 
    ser_elibs = "/home/hornik/tmp/scratch/RtmpqUDfhN/file558c8a20a0.rds")

 --- value of length: 2 type: logical ---
[1] FALSE FALSE
 --- function from context --- 
function (loc, mag.az, date, magdec, alt, name, ID, HWT.ID) 
{
    if (class(loc) == "skyscapeR.horizon") {
        hor <- loc
        loc <- loc$georef
    }
    else {
        hor <- NULL
    }
    if (NROW(loc) < NROW(mag.az) * 2) {
        loc <- matrix(loc, NROW(mag.az), 2, byrow = T)
    }
    if (!missing(date) & (NROW(date) < NROW(mag.az))) {
        date <- matrix(date, NROW(mag.az), 1, byrow = T)
    }
    if (!missing(alt)) {
        if (NROW(alt) < NROW(mag.az)) {
            alt <- matrix(alt, NROW(mag.az), 1, byrow = T)
        }
    }
    if (missing(magdec) & !missing(date)) {
        magdec <- mag.dec(loc, date)
    }
    prec <- max(nchar(sub(".*\\.", "", as.character(mag.az))))
    true.az <- round(mag.az + magdec, prec)
    df <- c()
    if (!missing(ID)) {
        df$ID <- ID
    }
    if (!missing(name)) {
        df$Name <- name
    }
    df$Latitude = loc[, 1]
    df$Longitude = loc[, 2]
    df$Magnetic.Azimuth = mag.az
    df$Date = date
    df$Mag.Dec = magdec
    df$True.Azimuth = true.az
    if (!missing(HWT.ID)) {
        df$HWT.ID <- HWT.ID
    }
    if (!missing(alt)) {
        message("Altitude values found. Calculating declination...")
        dec <- az2dec(true.az, loc, alt)
        df$Altitude = alt
        df$Declination <- dec
    }
    else if (class(hor) == "skyscapeR.horizon") {
        message("Horizon profile found. Obtaining altitude values and calculating declination...")
        dec <- az2dec(true.az, hor)
        df$Altitude <- hor2alt(hor, true.az)
        df$Declination <- dec
    }
    else {
        message("No altitude values or horizon profile found. Declination values were not calculated.")
    }
    df <- as.data.frame(df)
    return(df)
}
<bytecode: 0x563f9cac06a0>
<environment: namespace:skyscapeR>
 --- function search by body ---
Function reduct.compass in namespace skyscapeR has this body.
 ----------- END OF FAILURE REPORT -------------- 
Fatal error: the condition has length > 1