[gradsusr] wave model plotting

[bala vasanthakumar]

Hi all  can any one help me out regarding plotting of wave model through grads.as i am plotting wave direction and speed, through grads, and the problem is the arrow which is plotting was 180 deg opposite. can any one kindly help me out regarding how to plot the arrows towards the direction. 
'd  sin(dirpwsfc*3.14159/180);cos(dirpwsfc*3.14159/180)'the above said display i am using to plot the direction of the wave 
thanking u 
P BalavasanthakumarSr. ManagerSDSBangalore
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