Function "solve" returns a struct

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Marina Carnemolla
Marina Carnemolla 2019-7-28
编辑： Stephan 2019-7-28
Hi, I have the following equation:
where are defined by syms.
I need to find in that equation, so my solution should be:
I have used the following code:
sol=solve(equation==0, cos(q1))
However, what I get in my console is:
sol =
struct with fields:
q1: [0×1 sym]
q2: [0×1 sym]
Then I added:
sol.q1
and I got in the console:
ans =
Empty sym: 0-by-1

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回答（1 个）

Stephan
Stephan 2019-7-28
编辑：Stephan 2019-7-28
syms a1 a2 q1 q2
eq = a1*cos(q1) + a2*cos(q1)*cos(q2) - a2*sin(q1)*sin(q2) == 0
sol = isolate(eq,cos(q1))
pretty(sol)

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