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Ordinary differential equation

I have to solve a system of ordinary differential equations of the form: I've tried to solve this with ode45 with no success so far: I get the following error message: Oliver Amundsen 2 11 My bet would be that at least one of g , a , v0 , or d remain uninitialized, thus []. Using these "coefficients" will yield an empty vector for dyds.

Your equations are singular. I don't know if this is the source of your error, but it will be a problem. It is not best practice to use global variables here.

For transfer of Parameters with ode45 see: You were right they were empty. Now it works and I get the value of both variables, but I get this error message: The values of the global variables are vectors of 1x, so that's why I used the.

Systems of Ordinary Differential Equations - EqWorld

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Solve a system of several ordinary differential equations in several variables by using the dsolve function, with or without initial conditions. To solve a single differential equation, see Solve Differential Equation. First, represent u and v by using syms to create the symbolic functions u t and v t.

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Solve the system using the dsolve function which returns the solutions as elements of a structure. If dsolve cannot solve your equation, then try solving the equation numerically. To access u t and v t , index into the structure S. Alternatively, store u t and v t directly by providing multiple output arguments. The constants C1 and C2 appear because no conditions are specified. The dsolve function finds values for the constants that satisfy these conditions.