Periodic Functions

[Jeff Frame]

Hi,

I would like to display a periodic function, such as cos(x), for an
analytic terrain profile.  How would I limit this function to one
period, between two given x values?  For example, say my mountain exists
from x=190 - 210 km, but my display is set from x=170-230 km (to see the
upstream and downstream effects of the terrain).  Currently, I can only
get this function to plot for every period in the display range, whereas
I only want one period displayed.  My ultimate goal is to subtract off
this terrain height to convert heights from above sea level to above
ground level.

Any suggestions??

Thanks,

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Jeffrey Frame
Graduate Research Assistant
Ph.D. Candidate
Department of Meteorology
Penn State University
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