Equation-Defined Device cannot handle a^x when 0<x<1

[domispace]

Hello, Using Equation-Defined Devices (EDDs) featuring I1=(V1)^x when x is not an integer >=0. It works for ^0, ^1, ^2, ^n. Edit: also works for ^x too, e.g. ^2.1, ^(4/3)... It does not work for ^-1, ^-2 or ^(3/4), or ^0.8. Does it make sense to modify the EDD capability? i.e, is there another way to produce, for instance, a current that is proportional to the voltage at power(x) which make this request unuseful? Thanks.

[in3otd]

I think it does not converge when the exponent is less than 1, where the first derivative has a discontinuity at zero. A quick hack could be to add a small constant so the discontinuity moves elsewhere. "Of course" it will likely fail to converge again if you hit the discontinuity.

[domispace]

Thanks a lot! The trick seems to work. I have modified the title from "Equation-Defined Device cannot handle a^x when x is not an integer x>=0" to "Equation-Defined Device cannot handle a^x when 0<x<1", because using ^x with x>=1 without the trick (small amount added) works fine.