[R] as.Date and ylim in empty plot

Ogbos Okike
2018-09-19T14:55:04Z

Dear Experts,
I generated the plot attached. Every other thing is OK except the black
horizontal lines which should appear like points or dots as the coloured
ones. I can't understand why.

I tried to change it to look like dots by calling empty plots so that I
will add them as points.

Since I have a range of date that can fall any where within 2005, I tried:

plot(1, type="n", xlab="", ylab="",
xlim=c(as.Date("2005-01-01"),as.Date("2005-12-31")),
ylim=c(-.5, -10))

ylim worked fine but xlim instead of appearing like date as indicated on
the x-axes of the attached plot, translated to ordinary numbers (12800,
12900,13000, 13100).

All the data is of the same format:
2005-01-04 -2.76105935648091
2005-01-19 -9.60813496025994
2005-01-22 -7.92101965866777
2005-02-19 -1.61308152604905
2005-02-24 -1.51497015807712
2005-05-09 -2.06465797304654
2005-05-11 -1.14840389007051
2005-05-16 -3.85281900888504
2005-06-13 -1.18659683796617
2005-06-17 -3.48787712566258
2005-06-22 -1.14223758296308
2005-07-18 -4.96013018907366
2005-08-03 -1.24313324914368
2005-08-07 -2.96672894841722
2005-08-10 -1.11868063781156
2005-08-25 -1.46453734930983
2005-09-13 -8.00895215754776
2005-09-15 -6.63439065989452
2005-10-13 -2.25054996925846
2005-12-15 -1.08933890547705

Thank you so much for your input.

Best regards
Ogbos