Differences between the different solve/zeros commands?

10232014, 11:36 PM
Post: #1




Differences between the different solve/zeros commands?
What are the differences between the different solve/zeros commands and which commands are recommended when?
Trying to solve this for x but cant find a working command: ARG((e^(0.3*i*x))/(x^2i*x))=165 Any help would be really appreciated! 

10242014, 01:05 AM
Post: #2




RE: Differences between the different solve/zeros commands?  
10242014, 06:18 AM
Post: #3




RE: Differences between the different solve/zeros commands?  
10242014, 08:04 AM
Post: #4




RE: Differences between the different solve/zeros commands?
This equation has no solution. If you take exp(0.3*i*x), x must be in radians, therefore argument should be rescaled in pi..pi.
fsolve(arg((e^(0.3*i*x))/(x^2i*x))=165*pi/180,x=10..10) returns 2 solutions. 

10252014, 10:01 PM
Post: #5




RE: Differences between the different solve/zeros commands?
(10242014 08:04 AM)parisse Wrote: This equation has no solution. If you take exp(0.3*i*x), x must be in radians, therefore argument should be rescaled in pi..pi. Thanks! When is fsolve recommended and when is other commands recommended for solving? Any other cases radians must be selected? 

10262014, 07:34 AM
Post: #6




RE: Differences between the different solve/zeros commands?
fsolve is recommended if you want a numeric answer, solve if you want a symbolic answer (but solve can only find roots for polynomiallike equations).


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