[R] xyplot: modify axis tick marks

[Kang Min]

Hi,

I would like to plot time against rainfall data (data is at the end)
using xyplot.

The basic code looks like this: xyplot(rainfall~time, type="a")
When I do this, the graph looks ok except that the x-axis has too many
values. I would just like to display the years and not the months on
the x-axis. I've been fiddling around with 'scales', and read previous
posts about axis problems but I still can't find the solution.

Thanks in advance.

Kang Min

time	rainfall
Jan1993	176.4
Feb1993	69.2
Mar1993	250.5
Apr1993	283.9
May1993	129.9
Jun1993	115.5
Jul1993	240
Aug1993	106.8
Sep1993	61.7
Oct1993	175.5
Nov1993	250.8
Dec1993	308.5
Jan1994	56.9
Feb1994	133.5
Mar1994	288.2
Apr1994	154
May1994	169.6
Jun1994	184.7
Jul1994	53.8
Aug1994	45.1
Sep1994	23.7
Oct1994	84.7
Nov1994	322.2
Dec1994	425.4
Jan1995	349.4
Feb1995	334
Mar1995	67.7
Apr1995	242.3
May1995	84.4
Jun1995	63.7
Jul1995	173.6
Aug1995	211.6
Sep1995	29.5
Oct1995	101.1
Nov1995	372.8
Dec1995	302.5
Jan1996	173.2
Feb1996	180.2
Mar1996	129.7
Apr1996	178.2
May1996	107.5
Jun1996	265.8
Jul1996	162.3
Aug1996	258.4
Sep1996	297
Oct1996	300
Nov1996	180.2
Dec1996	185.5
Jan1997	15.4
Feb1997	105.4
Mar1997	34.3
Apr1997	118.4
May1997	41.6
Jun1997	78.9
Jul1997	18.6
Aug1997	86.6
Sep1997	31.1
Oct1997	78.4
Nov1997	158.3
Dec1997	351.9
Jan1998	268.8
Feb1998	32.5
Mar1998	58.8
Apr1998	187.7
May1998	370.8
Jun1998	198.8
Jul1998	259.2
Aug1998	195
Sep1998	258.2
Oct1998	222.7
Nov1998	107.2
Dec1998	463.4
Jan1999	193.9
Feb1999	67.4
Mar1999	181.4
Apr1999	88.5
May1999	157.1
Jun1999	103.4
Jul1999	225.4
Aug1999	204
Sep1999	125.9
Oct1999	205
Nov1999	241.5
Dec1999	340.5
Jan2000	275.2
Feb2000	237.8
Mar2000	238.3
Apr2000	311.6
May2000	96.8
Jun2000	157.5
Jul2000	116.1
Aug2000	113.5
Sep2000	81.1
Oct2000	120.9
Nov2000	385.7
Dec2000	236
Jan2001	425.8
Feb2001	86.6
Mar2001	297.3
Apr2001	203.3
May2001	164.9
Jun2001	137.1
Jul2001	111.3
Aug2001	158.3
Sep2001	162
Oct2001	252.2
Nov2001	175.3
Dec2001	609
Jan2002	221.2
Feb2002	50.8
Mar2002	55.6
Apr2002	116.5
May2002	236.6
Jun2002	83.1
Jul2002	233.7
Aug2002	54.2
Sep2002	124.2
Oct2002	10.8
Nov2002	307.2
Dec2002	255
Jan2003	444.2
Feb2003	172.9
Mar2003	154.6
Apr2003	159.9
May2003	81.8
Jun2003	50.3
Jul2003	170.4
Aug2003	193.6
Sep2003	205.3
Oct2003	351.4
Nov2003	133.8
Dec2003	273
Jan2004	600.9
Feb2004	31.9
Mar2004	269.4
Apr2004	57.1
May2004	137.6
Jun2004	127.2
Jul2004	166.6
Aug2004	185.2
Sep2004	128.9
Oct2004	125.6
Nov2004	166.2
Dec2004	139.8
Jan2005	163.2
Feb2005	8.4
Mar2005	82.4
Apr2005	81.7
May2005	331.1
Jun2005	82.3
Jul2005	104
Aug2005	58.5
Sep2005	175.7
Oct2005	314.5
Nov2005	362.9
Dec2005	166
Jan2006	454.4
Feb2006	115.5
Mar2006	83.1
Apr2006	239.8
May2006	205.7
Jun2006	236.8
Jul2006	153.8
Aug2006	127.3
Sep2006	83.3
Oct2006	102
Nov2006	185.6
Dec2006	765.9
Jan2007	450.1
Feb2007	105.5
Mar2007	269.1
Apr2007	240.2
May2007	127.2
Jun2007	139
Jul2007	141.7
Aug2007	190.7
Sep2007	149
Oct2007	237.2
Nov2007	367.9
Dec2007	468.6