Solve the Pendulum problem 2θ¨=-2sinθ-3θ˙
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回答（2 个）
Write your equation as a system of two first-order equations and use ode45 to solve.
Sam Chak
2023-9-7
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Hi @Nirupa
If you are determined to learn solving differential equations using MATLAB, there are various examples in the following links:
You will appreciate what MATLAB/Simulink and various useful toolboxes can do for you.
For my coursemates, who struggle with comprehending that 
can be equivalently rewritten as:
can be equivalently rewritten as:
where 
and 
, I usually recommend the popular Polymath to them as a start for tackling differential equations with ease. It is a Graphical User Interface (GUI)-based math solver where the user simply needs to:
and , I usually recommend the popular Polymath to them as a start for tackling differential equations with ease. It is a Graphical User Interface (GUI)-based math solver where the user simply needs to:- Enter a math problem (1st-order differential equations and initial values) in plain text, and
- Press the 'Solve' button to get a numeric solution.
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