s="helptopic">Difference of two angles</span></p><p>
<strong>d</strong> = <span style="color:red">angdiff</span>(<strong>th1</strong>, <strong>th2</strong>) returns the difference between angles <strong>th1</strong> and <strong>th2</strong> on
the circle.  The result is in the interval [-pi pi).  If <strong>th1</strong> is a column
vector, and <strong>th2</strong> a scalar then return a column vector where <strong>th2</strong> is modulo
subtracted from the corresponding elements of <strong>th1</strong>.

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