That should work, but I just confirmed that it appears to be a bug. I'm guessing it's doing a divide by zero when x is zero. We'll get a fix into a future release. In the meantime you can approximate using something like y=1/(x+0.000001) - not a perfect solution but at least it'll get you closer.
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Originally Posted by Kozy
Can the gCalc graph functions with asymptotic behavior? Because whenever I try to graph 1/x or any variation, it gives me an error? Is this just a setting that can be changed, or is it an incapability with the gCalc? If so, is this something that is going to be changed?