Say for instance I have the following data:

A:=[3 5 1 7 2]
B:=[-4 2 5 1 6]

where A is the x-axis and B the y-axis.

I can generate a plot of all the data, but I now want to plot only the data points [5,2], [1,5] and [2,6]. How can I select only those elements to use in the plot?

I want a 2D plot, and I want to be able so select which ever data I want to use for my plot.  So it's not necessarily only the positive or negative values, I need a function or command to select only certain values from my whole list of values to plot. I had a look at the view option, but with that I can only limit my axes as far as I know and I don't want to place the restriction on my axes, I want to place restrictions on my data points.

I hope that I made myself clear enough?

Thanks!