Delete recurring character from Matrix

    Dec 31 2013 | 4:14 pm
    Hey this might be pretty simple but I can't seem to figure it out, I'm pretty new to this. I have a matrix of data imported from the web that looks something like this (only many times longer):
    773 P 428 P -121 P -878 P -946 P -1220 P -1430 P -815 P 2320 P 7180 P 9280 P 10300 P 10800 P 11500 P
    I need to remove the 'P' from every line and find the average of the numbers. I can't offset the matrix because the different lengths of the numbers. Any clues?
    Thanks all! Aaron