[R] Contour plot

[lkchan]

Hi, I would like to make a contour plot with the data below, x-axis= Day
(increasing order, day number is out of 365 days of a year), y-axis= Depth
(varies), and z=pH. I tried to use filled.contour function, but not sure the
proper way to ordinate my z results into a matrix with different x and y
length. After that, if I attempted to plot the data, the x and y values are
not in ascending order...so a filled contour plot cannot be made. Any help
is appreciated!

Thanks!

Leo 

Day	Month	Depth	pH
23	Jan	0	4.9
23	Jan	3	4.93
23	Jan	7	5.05
52	Feb	0	4.93
52	Feb	3	4.92
52	Feb	7	5.54
86	Mar	0	4.93
86	Mar	3	5.09
86	Mar	7	5.32
115	Apr	0	4.92
115	Apr	3	4.88
115	Apr	7	5.385
142	May	0	4.99
142	May	2	4.805
142	May	5	5.31
142	May	7	5.41
169	Jun	0	4.935
169	Jun	2	4.66
169	Jun	3	4.96
169	Jun	7	5.55
198	Jul	0	5.19
198	Jul	3	5.1
198	Jul	5	5.59
198	Jul	7	5.8
225	Aug	0	5.05
225	Aug	2	4.88
225	Aug	5	5.31
225	Aug	7	5.53
225	Sep	0	4.78
225	Sep	2	4.76
225	Sep	5	5.22
225	Sep	6	5.4
282	Oct	0	4.8
282	Oct	3	4.91
282	Oct	5	5.185
282	Oct	6	5.32
319	Nov	0	5.06
319	Nov	3	5.05
319	Nov	7	5.11

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