How do i understand the output of a solve function?

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Mikkel
Mikkel 2014-5-20
评论： Mikkel 2014-6-9
Hi I have solved two equations and now I would like to calculate/simplify the results, before I turn them from rad's to deg's. But somehow I wont allow me to. My code (so far) looks like this:
syms x
eta = ((30+42)/2)*(pi/180);
gamma = 2*pi/3;
X = solve(1*cos(gamma-eta)-1.2*cos(x-eta),x)
Y = solve(1*sin(gamma-eta)-1.2*sin(x-eta),x)
My results then become
X =
pi/5 + acos(12553449285915085/144115188075855872)
pi/5 - acos(12553449285915085/144115188075855872)
Y =
pi/5 + asin(22394642186961775/27021597764222976)
(6*pi)/5 - asin(22394642186961775/27021597764222976)
what I would like to do is simmelar to
>> pi/5 + acos(12553449285915085/144115188075855872)
ans =
2.1119
>> radtodeg(ans)
ans =
121.0028
But this I can only do from the command window, How do I do this from my code?
  2 个评论
Star Strider
Star Strider 2014-5-20
The obvious suggestion is for you to post the relevant parts of your script ‘.m’ file.
What errors or unexpected results do you get when those commands are part of your script file?
Mikkel
Mikkel 2014-6-9
The unexpected result would be that of the secound section with code.. and what I would like was the theerd code section. But I found that a simple eval(solve(...)) solved my problem.

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采纳的回答

Mischa Kim
Mischa Kim 2014-5-21
Mikkel, use
X = vpa(solve(1*cos(gamma-eta)-1.2*cos(x-eta),x))
Y = vpa(solve(1*sin(gamma-eta)-1.2*sin(x-eta),x))
instead.
  1 个评论
Mikkel
Mikkel 2014-6-9
This seemed to give me the same result. But a eval(solve(...)) gave me the expresion in the form that I was looking for

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