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<font face="Courier New, Courier, monospace"><b>Hallo,</b><b><br>
</b><b>To solve the equation of motion for a mass point m in a
constant force field f=[fx; fy; fz] one can use ode(...)
with the function</b><b><br>
</b><b><br>
</b><b>function dz=EoM(t, z, m,f)//z=[x; y; z; vx; vy; vz]
(6 x 1)</b><b><br>
</b><b> dz(1:3)=z(4:6)</b><b><br>
</b><b> dz(4:6)=f/m</b><b><br>
</b><b>endfunction</b><b><br>
</b><b><br>
</b><b>If the motion shall be constrained to a sphere of
constant radius R - is there a way to implement this
constraint into the function. </b><b><br>
</b><b><br>
</b><b>Of course spherical coordinates may be a better choice,
however I am looking for a cartesion solution.</b><b><br>
</b><b><br>
</b><b>Kind regards </b><b><br>
</b><b>Jens</b></font></span></font><font face="Courier New,
Courier, monospace"><b><br>
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