How Can I Use plot2d code for presence of singularities?

• Subject: How Can I Use plot2d code for presence of singularities?
• From: Edwin Woollett
• Date: Sun, 23 Dec 2012 12:46:38 -0800

If I use plot2d(1/sin(x),[x,-1,1]), I immediately get the
screen response:

    "plot2d: expression evaluates to non-numeric value
                 somewhere in plotting range."

How can I use the plot2d code (only) to capture this
message, and thus quickly detect a singularity in
an arbitrary function (either in interactive use or
in a user defined function)?

Ted Woollett

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