Dear R users,

I have a matrix "final" which looks like this:

final
         oSO4   oNO3       mSO4       mNO3
 [1,]  3.3728 0.2110  1.9517421 1.01883602
 [2,]  0.8249 0.0697  1.5970292 0.11368781
 [3,]  0.2636 0.1004  0.6012445 0.24356332
 [4,]  8.0072 0.3443  6.1016998 3.63207149
 [5,] 13.5079 0.6593 12.4011068 1.55323386
 [6,]  6.1293 0.1989  5.7620926 0.12884845
 [7,]  0.6004 0.0661  0.7375408 0.17218600
 [8,]  0.6912 0.1672  1.1563314 0.13469750
 [9,]  1.0478 0.1504  1.5637809 0.99000758
[10,]  0.4825 0.1160  0.2297545 0.08121805

I would like to create boxplots for this matrix with data binned by
oNO3, oSO4, mNO3 and mSO4, all in the same plot. 

I tried 
boxplot(final), boxplot(final[,1]) etc. But all those commands create
individual plots and not what I am trying to achieve. I was wondering if
there is an R equivalent of the matlab command "hold on" or if there is
a simpler way around this.



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