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Any way to detect division by zero?

asked 2010-12-08 19:02:45 +0200

Shu gravatar image

updated 2010-12-09 15:04:33 +0200

niles gravatar image

In Sage, is there any way (function call) to check whether a given expression will produce division by zero error. Is something like the following possible?

if IsDivisionByZero(expr): return False

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answered 2010-12-08 19:17:53 +0200

You can use Python try...except blocks to catch a ZeroDivisionError. For example, I define the two functions

def foo(x):
    return 1/x

def bar(x):
        return 1/x
    except ZeroDivisionError:
        # error handling: do whatever you want here
        print "Returning positive infinity..."
        return Infinity

This is what the output looks like when giving various inputs into these two functions.

sage: foo(1)
sage: foo(0)
Traceback (click to the left of this block for traceback)
ZeroDivisionError: Rational division by zero
sage: bar(1)
sage: bar(0)
Returning positive infinity...

You can use try...except blocks outside of function definitions as well.

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answered 2010-12-08 19:14:32 +0200

Something like this:

def temp(x):
        return 3/x
    except ZeroDivisionError:
        return False


sage: temp(2)
sage: temp(0)
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Asked: 2010-12-08 19:02:45 +0200

Seen: 2,972 times

Last updated: Dec 09 '10