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Attempt to evaluate real logarithm of negative number.
Posted 21 mars 2017, 11:15 UTC−4 Results & Visualization 1 Reply
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Hi, All
I got this error when I run the simulation:
" Attempt to evaluate real logarithm of negative number.
- Function: log
Failed to evaluate variable.
- Variable: comp1.semi.Efp
- Defined as: comp1.semi.Ev-(comp1.semi.Vth*log(comp1.semi.P/(comp1.semi.gamma_p*comp1.semi.Nv))) "
I tried to calculate the component in log (i.e., comp1.semi.P/(comp1.semi.gamma_p*comp1.semi.Nv) ) in Comsol Results and the result shows that this component indeed a positive number with a order about 10^-4~10^-9. If so, why I still face this error?
Can anybody help?
Best regards
I got this error when I run the simulation:
" Attempt to evaluate real logarithm of negative number.
- Function: log
Failed to evaluate variable.
- Variable: comp1.semi.Efp
- Defined as: comp1.semi.Ev-(comp1.semi.Vth*log(comp1.semi.P/(comp1.semi.gamma_p*comp1.semi.Nv))) "
I tried to calculate the component in log (i.e., comp1.semi.P/(comp1.semi.gamma_p*comp1.semi.Nv) ) in Comsol Results and the result shows that this component indeed a positive number with a order about 10^-4~10^-9. If so, why I still face this error?
Can anybody help?
Best regards
1 Reply Last Post 21 mars 2017, 15:13 UTC−4
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Posted:
8 years ago
You appear to be using one of the applications that I'm not very familiar with, but I'll risk appearing ignorant and offer you a suggestion:
Are you *sure* that for ALL cases (e.g., locations, time steps, frequencies, etc), that may be being subjected to evaluation(s):
1) The number in question is never negative.
2) The number in question is never zero.
3) The number in question is purely real, not complex (not sure if this reqrmt is critical or not)
Are you *sure* that for ALL cases (e.g., locations, time steps, frequencies, etc), that may be being subjected to evaluation(s):
1) The number in question is never negative.
2) The number in question is never zero.
3) The number in question is purely real, not complex (not sure if this reqrmt is critical or not)