# MATLAB Help me with coupled ode45 equations in matlab

#### sophieji

Help me with coupled ode45 equations in matlab plz

I have no idea to turn these into matlab code, and here is the porblem:
y(1)' = y(2)
y(2)' = - (r+re)/(L+le)*y(2) - y(1)/c*(l+le)
y(3)' = y(4)
y(4)' = -c*y(4).^2 /m+L*y(2).^2/(2*m)
where
re = ro+Rpr*z+Lpr*z'
le = Lo+Lpr*z
the rest parameters are given numbers, and z is the changing position, the variable.
the given task is like this, two differential equations:
(L+le)*q''+(r+re)*q'+q/c=0
z''+c*(z')^2/m=Lpr*(q').^2/(2*m)
I appreciate your help!

Related Math Software Workshop News on Phys.org

### Want to reply to this thread?

"Help me with coupled ode45 equations in matlab"

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving