[Metalab] OT: Matlab/Scilab/Octave Frage

[Marius Kintel]

On Dec 28, 2007, at 1:40 AM, Clifford Wolf wrote:

> Das Problem ist, dass ich da in der funktion ueber die ich  
> integriere das
> integral von 0 bis x-dt verwende. Ideas or hints anyone?
>

I guess you already know this, but in case you need some hints, this  
is the first thing which comes to mind
(I've long forgotten the math behind this though):

You're obviously trying to solve a RC circuit. Since the voltage in  
question is dependant on the current going through the circuit, which  
again is dependant on the derivate of the voltage, you get a  
differential equation.
Exactly how such software packages solve differential equations  
numerically, I don't know, but I guess you might have to specify the  
equation on some standard form for differential equations, not in form  
of an integral using it's own partial result.

Alternatively, if you google a bit, you'll probably find the resulting  
exponential function and can substitute that one instead, unless this  
is part of a larger, more complicated circuit, and unless you're  
solving it numerically for some other reason.

..or ask Isis how to solve such differential equations analytically ;)

~/= Marius

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