[R] Question about error message - or is it a bug?

[Carmen Meier]

Hi to all ... the same code, but another question.

I changed only the type='n' to type='l' and debugged the function xy.coords.
with type = 'l' :
there are the correct values of x and y inside the function xy.coords
but the y value is filled with NA seems that the length is matching now 
because of the NAs

with type = 'n' :
there are the wrong values of x in the function xy.coords
and the y value is not filled with NA
So there is a length mismatch additionally to the wrong x values

Maybe anybody could evaluate whether this is an error (some kind of 
misunderstanding)  from me or a bug

Regards Carmen
see codes below

#------------------- Code -------------------------------------------


time <- 
c("2:25:00","2:26:00","2:27:00","2:28:00","2:29:00","2:30:00","2:31:00",
     "2:32:00","2:33:00","2:34:00","2:35:00","2:36:00","2:37:00","2:38:00",
 
"2:39:00","2:40:00","2:41:00","2:42:00","2:43:00","2:44:00","2:45:00",
 
"2:46:00","2:47:00","2:48:00","2:49:00","2:50:00","2:51:00","2:52:00",
 
"2:53:00","2:54:00","2:55:00","2:56:00","2:57:00","2:58:00","2:59:00",
 
"3:00:00","3:01:00","3:02:00","3:03:00","3:04:00","3:05:00","3:06:00",
 
"3:07:00","3:08:00","3:09:00","3:10:00","3:11:00","3:12:00","3:13:00",
          "3:14:00")
y <- c(0,10)
plot(times(time), y, type='n')


#------------------ Debugging ---------------------------------------
debug(xy.coords)
plot(times(time), y, type='l')


debug: if (is.null(y)) {
     ylab <- xlab
     if (is.language(x)) {
         if (inherits(x, "formula") && length(x) == 3) {
             ylab <- deparse(x[[2]])
             xlab <- deparse(x[[3]])
             y <- eval(x[[2]], environment(x), parent.frame())
             x <- eval(x[[3]], environment(x), parent.frame())
         }
         else stop("invalid first argument")
     }
     else if (inherits(x, "ts")) {
         y <- if (is.matrix(x))
             x[, 1]
         else x
         x <- stats::time(x)
         xlab <- "Time"
     }
     else if (is.complex(x)) {
         y <- Im(x)
         x <- Re(x)
         xlab <- paste("Re(", ylab, ")", sep = "")
         ylab <- paste("Im(", ylab, ")", sep = "")
     }
     else if (is.matrix(x) || is.data.frame(x)) {
         x <- data.matrix(x)
         if (ncol(x) == 1) {
             xlab <- "Index"
             y <- x[, 1]
             x <- seq_along(y)
         }
         else {
             colnames <- dimnames(x)[[2]]
             if (is.null(colnames)) {
                 xlab <- paste(ylab, "[,1]", sep = "")
                 ylab <- paste(ylab, "[,2]", sep = "")
             }
             else {
                 xlab <- colnames[1]
                 ylab <- colnames[2]
             }
             y <- x[, 2]
             x <- x[, 1]
         }
     }
     else if (is.list(x)) {
         xlab <- paste(ylab, "$x", sep = "")
         ylab <- paste(ylab, "$y", sep = "")
         y <- x[["y"]]
         x <- x[["x"]]
     }
     else {
         if (is.factor(x))
             x <- as.numeric(x)
         xlab <- "Index"
         y <- x
         x <- seq_along(x)
     }
}
Browse[1]>
debug: if (inherits(x, "POSIXt")) x <- as.POSIXct(x)
Browse[1]>
debug: if (length(x) != length(y)) {
     if (recycle) {
         if ((nx <- length(x)) < (ny <- length(y)))
             x <- rep(x, length.out = ny)
         else y <- rep(y, length.out = nx)
     }
     else stop("'x' and 'y' lengths differ")
}
Browse[1]> x
  [1] 0.1006944 0.1013889 0.1020833 0.1027778 0.1034722 0.1041667 
0.1048611 0.1055556 0.1062500
[10] 0.1069444 0.1076389 0.1083333 0.1090278 0.1097222 0.1104167 
0.1111111 0.1118056 0.1125000
[19] 0.1131944 0.1138889 0.1145833 0.1152778 0.1159722 0.1166667 
0.1173611 0.1180556 0.1187500
[28] 0.1194444 0.1201389 0.1208333 0.1215278 0.1222222 0.1229167 
0.1236111 0.1243056 0.1250000
[37] 0.1256944 0.1263889 0.1270833 0.1277778 0.1284722 0.1291667 
0.1298611 0.1305556 0.1312500
[46] 0.1319444 0.1326389 0.1333333 0.1340278 0.1347222
attr(,"format")
[1] "h:m:s"
Browse[1]> y
  [1]  0 10 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 
NA NA NA NA NA NA NA NA
[31] NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA
Browse[1]>
#----------------------------------------------------------------------

debug(xy.coords)
plot(times(time), y, type='n')



debug: if (length(x) != length(y)) {
     if (recycle) {
         if ((nx <- length(x)) < (ny <- length(y)))
             x <- rep(x, length.out = ny)
         else y <- rep(y, length.out = nx)
     }
     else stop("'x' and 'y' lengths differ")
}
Browse[1]>
debug: if (recycle) {
     if ((nx <- length(x)) < (ny <- length(y)))
         x <- rep(x, length.out = ny)
     else y <- rep(y, length.out = nx)
} else stop("'x' and 'y' lengths differ")
Browse[1]>
Fehler in xy.coords(x, y, xlabel, ylabel, log) :
         'x' and 'y' lengths differ
 > x
  [1] 2 1 0 0 0 1 0 0 0 3 3 3
 > y
[1]  0 10