fsolve bug?

03012014, 12:08 AM
Post: #1




fsolve bug?
Using fsolve to find the roots of the equation: x + 4.5sin(x) = 5, I can get the
two roots [1.0645, 6.0481], but I am unable to get the third root 2.5716 no matter how close a guess I set x to. For example, if I enter fsolve(x+4.5sin(x) = 5, x = 2.5716), I get 1.0645 as the root. Is there a way to solve this equation for all of its roots in CAS mode? fsolve should do it. 

03012014, 12:26 AM
Post: #2




RE: fsolve bug?
I posted too soon, my apologies. fsolve requires a minimum and maximum value
for the guess. If I enter fsolve(x+4.5sin(x) = 5,x,1..7), I get all of the roots. Sorry about that. I tried to delete this post, but the forum wouldn't let me. 

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