Question 939713
How do I write |t| as an algebraic expression?
<pre>
There are two ways:

(1) As the non-negative square root of a square

{{{abs(t)}}}{{{""=""}}}{{{sqrt(t^2)}}}

(2) As a piecewise function:

{{{abs(t) = system(matrix(2,3,t,if,t>=0,-t,if,t<0)) }}}

Edwin</pre>