Hi, I would like to make a contour plot using R with the following information (data at the end): x-axis= arranged according to day (from 1 to 365, labels= use months; up to 365 days in one year), y-axis= depth (labels from 0 at the top to 7 at the bottom; this is a water depth profile), and z-axis= pH. So, this would be a pH contour plot of different dates throughout a year, with pH measured at different depths (0 meter to 7 meters). I tried to use various contour plot packages, but always have trouble with y axis data that are not arranged in ascending order thus failed to make a matrix for data in the z-axis (pH). So, I used akima to make a matrix (data.interp<-interp(x,y,z,duplicate="mean")) but the results is a square matrix- Not sure if the data is correct. So, any help/suggestion would be great! An example image that I would like to make is here: http://neuer.lab.asu.edu/images/10_data/roosevelt_temp.JPG

Thanks so much!

Leo


Data:
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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