The Math Forum

Search All of the Math Forum:

Views expressed in these public forums are not endorsed by NCTM or The Math Forum.

Math Forum » Discussions » Software » comp.soft-sys.matlab

Notice: We are no longer accepting new posts, but the forums will continue to be readable.

Topic: Using Solve/FSolve for Multiple Trig Equations
Replies: 7   Last Post: May 4, 2013 8:44 AM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
Nasser Abbasi

Posts: 6,677
Registered: 2/7/05
Re: Using Solve/FSolve for Multiple Trig Equations
Posted: May 1, 2013 2:24 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

On 5/1/2013 11:16 AM, Jung wrote:
> Hello,
> I am trying to solve for:
> y
> r
> p
> in the following equations where I, J, K are known.
> I = siny * sinr + cosy * sinp * cosr
> J = -siny * cosr + cosy * sinp * sinr
> K = cosy * cosp
> The code I have used is:
> syms r p y i j k
> S = solve(i == sin(y)*sin(r)+cos(y)*sin(p)*cos(r), j == -sin(y)*cos(r)+cos(y)*sin(p)*sin(r), k == cos(y)*cos(p))
> S.r
> S.p
> S.y
> but I cannot seem to get a result.

it is normally very hard to obtain analytical solutions for
trig equations since these are nonlinear and involves inverse functions
with branch cuts as well. So to solve for 'y','p', and 'r'
about, you might want to try a numerical approach.

But I am not an expert in this.


Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© The Math Forum at NCTM 1994-2018. All Rights Reserved.