what does this result mean?

[YA_10963798]

Hi there, 

I'm wondering what does the (i) represent in mathcad? 

[Werner_E · Accepted solution]

i is the imaginary unit (the non-real number whose square is -1).

Obviously your results are non-real - maybe somewhere in the calculations you are taking the root of negative numbers or the like ...

[YA_10963798]

Yes you are right. thank you