Speeding up Plotting Lines Using the Mapping Package

Hi, I've got a bunch of GPS data from runs of a car and want to plot it nicely on a map with delays between each point. I've tried using wmline in a loop plotting it piecewise, but it's very slow and hangs after plotting a few hundred points. Does anyone have any suggestions on speeding it up?

Plotting it as points also works as there's enough data for that to work but I don't want the big markers from the wmmarker command though the additional data would be useful (I've also got velocity, speed, heading, etc.). My mapping code is below:

for(i=2:size(lat,1))
  wmline([lat(i-1,1)/10^7,lat(i,1)/10^7],[long(i-1,1)/10^7,long(i,1)/10^7]);
  pause(0.1);
end

Answer 1

[Chad Greene]

Why use a loop? You should be able to do

 wmline(lat*1e-7,long*1e-7)

without any loops at all. If you must use a loop, you can speed it up by removing that 0.1 second pause each time through the loop.