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Question: Error Differential equation

Question:Error Differential equation

giel.vdb 12 Maple
array constants error convert linear
November 04 2009
0
Hi, I'm trying to solve a non-linear difference equation numerically, but I receive following error: "Error, (in DEtools/convertsys) unable to convert to an explicit first-order system" I filtered the essential parts out of my code: a:=t->T(t)/m(t)-G0*m_aarde/(R_aarde+y(t))^2;

ss:=dsolve({Diff(y(t),t,t)=a(t),y(t0)=0,diff(y(t),t)(0)=0},{y(t)},numeric,method=gear,output=array([seq(k,k=1..astappen)])); So far, I checked wether the used constants (m_aarde, R_aarde, t0 and G0) are defined properly, and they are. I suppose there's a problem with the conditions "y(t0)=0,diff(y(t),t)(0)=0". I tried different combinations, but it always resulted in an error. Anyone has an idea how to solve this? Thanks in advance. Giel
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