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Feb
26
comment Why does FindMinimum return 'The function value Null is not a real number'?
@Lupacante This works OK on V9 and V10. Confirmed.
Feb
26
reviewed Leave Open How to specify the domain of a variable?
Feb
26
reviewed Leave Open Ghost trails with Animate?
Feb
26
answered NestList and RandomChoice from a list of functions
Feb
26
comment Can't get solution to a system of recurrence equeations
Welcome to Mathematica.SE! I suggest the following: 0) Browse the common pitfalls question 1) As you receive help, try to give it too, by answering questions in your area of expertise. 2) Read the faq! 3) When you see good questions and answers, vote them up by clicking the gray triangles, because the credibility of the system is based on the reputation gained by users sharing their knowledge. Also, please remember to accept the answer, if any, that solves your problem, by clicking the checkmark sign!
Feb
26
comment Can't get solution to a system of recurrence equeations
@vpprof See edit, please
Feb
26
revised Can't get solution to a system of recurrence equeations
added 372 characters in body
Feb
26
comment Why does FindMinimum return 'The function value Null is not a real number'?
@Lupacante What Mathematica version are you using?
Feb
26
comment Can't get solution to a system of recurrence equeations
@vpprof You need to set a starting point ... from that you can calculate upwards OR downwards
Feb
26
answered Can't get solution to a system of recurrence equeations
Feb
26
comment Can't get solution to a system of recurrence equeations
You are setting the fs at zero and at one. The recursive relationship you're using is based on previous values. So, there is no way for Mma to calculate (for example) f1[-2]
Feb
26
comment Why does FindMinimum return 'The function value Null is not a real number'?
@bills I hate those Do[]s :)
Feb
26
comment Computing launch parameters for hitting a point in 3D with projectile under influence of wind
@Julian Pretty simple. For each possible target point you can sample the {Ux,Uy,Uz} space with params[target, U] and then build up an Interpolation[] for each one of {v,theta,phi}. Or use NonLinearModelFit[] if you know or presume some particular functional dependence.
Feb
26
revised Computing launch parameters for hitting a point in 3D with projectile under influence of wind
added 23 characters in body
Feb
26
comment Computing launch parameters for hitting a point in 3D with projectile under influence of wind
@Julian Take a look now
Feb
26
revised Computing launch parameters for hitting a point in 3D with projectile under influence of wind
deleted 110 characters in body
Feb
26
comment Why does FindMinimum return 'The function value Null is not a real number'?
@Lupacante It works as is here. Try it after starting a fresh Mathematica session
Feb
26
comment Computing launch parameters for hitting a point in 3D with projectile under influence of wind
@Julian You only need to make a function from my answer.
Feb
26
answered Why does FindMinimum return 'The function value Null is not a real number'?
Feb
26
revised Linearization of differential equation - need tips for the use of Series function
deleted 603 characters in body