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description of highlighted code

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SYED
SYED 2024-4-19
回答： Steven Lord 2024-4-19
what does it represent n highlighted area

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回答（2 个）

ScottB
ScottB 2024-4-19
The first line of the highlighted code means the element of matrix dxdt in row 1 column 1 is equal to the second element of the vector X.
The second line means the element of matrix dxdt in row 2 column 1 is equal to the subsequent expression.
Steven Lord
Steven Lord 2024-4-19
From the variable names and the signature, this looks like a function you wrote or were given as part of solving a system of ODEs. If you're not sure how to use this to solve such a system, see the "Solve Nonstiff ODEs" and "Solve Stiff ODEs" topics on that documentation page; they each walk through an example of how to translate the mathematical form of a system of ODEs into a solution using the ODE solver functions like ode45 or ode15s.

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