R help - Sep 2005 - Problems plotting time-series with multiple lines

Dear Sirs,

I want to plot a time series with lines, one for each variable.
I have a dataset with dates, and the values.
How can i plot?
I could plot one variable using index plot, bu i want to put the labels on X 
axis. But i had two problems:
1) The plot function, when i try to plot(x,y), incorectly sort the date (on 
X axis). My dataset has the date in string format "%d/%m/%Y).
If i try to converto to date using
as.Date(Dataset.dates,"%d/%m/%Y)
it interprets the %Y incorrectly.

2) I have 187 rows. So i have to plot only some of the dates, not all.

Please, help me.

Thanks in advance.

Best Regards,

Jos?? Augusto M. de Andrade Jr.

"Computer games don't affect kids; I mean if Pac-Man affected us as
kids,
we'd all be running around darkened rooms, munching magic pills and 
listening to
repetitive electronic music." (Kristian Wilson, Nintendo, Inc. 1989)

On 9/2/05, Jose Augusto Jr - jamaj - terra <jamaj at terra.com.br>
wrote:
> Dear Sirs,
> 
> I want to plot a time series with lines, one for each variable.
> I have a dataset with dates, and the values.
> How can i plot?
> I could plot one variable using index plot, bu i want to put the labels on
X
> axis. But i had two problems:
> 1) The plot function, when i try to plot(x,y), incorectly sort the date (on
> X axis). My dataset has the date in string format "%d/%m/%Y).
> If i try to converto to date using
> as.Date(Dataset.dates,"%d/%m/%Y)
> it interprets the %Y incorrectly.
Please provide a reproducible example.
> 
> 2) I have 187 rows. So i have to plot only some of the dates, not all.
Check out plot.Date, lines.Date and axis.Date.
Also plot.zoo in the zoo package may be of use.

He you checked this example?:
z <- ts(matrix(rt(200 * 8, df = 3), 200, 8), start = c(1961,1), frequency = 
12)
z <- window(z[, 1:3], end = c(1969, 12))
plot(z, plot.type = "single", lty = 1:3, col = 4:2)

It is from the help page of plot.ts

Felipe


"Jose Augusto Jr - jamaj - terra" <jamaj at terra.com.br> wrote
in message
news:001b01c5b032$933e8a90$6300a8c0 at 3k54gri437t...
Dear Sirs,

I want to plot a time series with lines, one for each variable.
I have a dataset with dates, and the values.
How can i plot?
I could plot one variable using index plot, bu i want to put the labels on X
axis. But i had two problems:
1) The plot function, when i try to plot(x,y), incorectly sort the date (on
X axis). My dataset has the date in string format "%d/%m/%Y).
If i try to converto to date using
as.Date(Dataset.dates,"%d/%m/%Y)
it interprets the %Y incorrectly.

2) I have 187 rows. So i have to plot only some of the dates, not all.

Please, help me.

Thanks in advance.

Best Regards,

Jos?? Augusto M. de Andrade Jr.

"Computer games don't affect kids; I mean if Pac-Man affected us as
kids,
we'd all be running around darkened rooms, munching magic pills and
listening to
repetitive electronic music." (Kristian Wilson, Nintendo, Inc. 1989)

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