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Hi...

How can I create a vector of state space variables by a loop to get

[x(1), x(2), x(3),.....x(21)]

I need this vector to use it in ODE15 as state space variables vector multiplied by other matrices forming DAEs.

Thanks

John D'Errico
on 15 Mar 2015

Edited: John D'Errico
on 15 Mar 2015

The problem is, you apparently do not appreciate the basics of MATLAB.

One does not create a vector of (symbolic) variables to use in a tool like ode15s. ode15s takes a vector of NUMERIC starting values. It then returns a predicted solution based on the equations you pose, at a given set of times.

There are no symbolic variables that you need to create or define or allocate here. Really, it is best that you start reading the basic tutorials about variables and how to call functions, etc. These are fundamental concepts in MATLAB.

Regardless, as the help for sym indicates:

A = sym('A',[M N])

This creates M-by-N vectors or matrices of symbolic scalar variables.

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