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## Re: System of two equations of ODE2

**From**: |
Montgomery-Smith, Stephen |

**Subject**: |
Re: System of two equations of ODE2 |

**Date**: |
Tue, 23 Dec 2014 22:24:08 +0000 |

**User-agent**: |
Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 |

On 12/22/2014 02:57 PM, ben wrote:
>* Hi!!*
>* *
>* I'm new on this forum, and also new on OCTAVE.*
>* *
>* I have to do a practise, and i have a big problem. I have two ODEs and i*
>* have to put them in a system(like a vector), and this two ODEs have four*
>* initial conditions. *
>* Has anybody know how to make this??*
>* I now thas the function is lsode, but i have no idea how to make a system*
>* for the two differential equations.*
Is this what you want?
http://tutorial.math.lamar.edu/Classes/DE/SystemsDE.aspx Examples 1 and 2.
This and many similar web pages can be found by googling "convert higher
order ode to first order"
But I am only guessing this is what you want, since you didn't specify
the order of the two given ODEs. If the 2 ODEs are both first order,
then 4 initial conditions is too many.