[R] Problems producing a simple plot

[Steve Murray]

Dear R Users,
 
I have a data frame of the nature:
 
> head(aggregate_1986)
  Latitude Mean Annual Simulated Runoff per 1° Latitudinal Band
1      -55                                            574.09287
2      -54                                            247.23078
3      -53                                            103.40756
4      -52                                             86.99991
5      -51                                             45.21980
6      -50                                             55.92928
  Mean Annual Observed Runoff per 1° Latitudinal Band
1                                            491.9525
2                                            319.6592
3                                            237.8222
4                                            179.5391
5                                            105.2968
6                                            136.6124
 
 
I am hoping to plot columns 2 and 3 against Latitude. I understand that you have to do this by plotting one column at a time, so I have been starting by attempting the following, but receiving errors:
 
> plot(aggregate_1986[1] ~ aggregate_1986[2], type="l")
Error in model.frame.default(formula = aggregate_1986[1] ~ aggregate_1986[2],  : 
  invalid type (list) for variable 'aggregate_1986[1]'
 
 
Or...
 
 
>  plot(aggregate_1986[1],aggregate_1986[2], type="l")
Error in stripchart.default(x1, ...) : invalid plotting method
 
 
I'm obviously doing something fundamentally wrong (!). I'd be grateful for any suggestions as to how I should go about this.
 
Many thanks,
 
Steve