[support] profile value question

[VJ]

Hi,

I have a profile field whose value is dynamically generated in code.

How do I save the field?

$user->profile_fieldname="node/$nid";
profile_save_profile($user); I have also tried
profile_save_profile($user,"fieldname") but its expecting something for
&$edit.

What is the correct way of saving profile?

Thanks,

V