## 60 Reputation

17 years, 43 days

## Tex error: 'The function ne() has been.....

Dear All,

I've just started using MapleTA and I'm exploring the Latex capabilities. The test question that I have constructed looks like:

\begin{question}{blanks}
\qutext{Test  \blank[formula]{\var{ans}} Test.}
\code{
$a2=Matrix([[1,2],[3,4]]);$c=LinearAlgebra[MatrixInverse]($a2);$a=rand(5,9,2);
$inc=int(rint(3)+2);$b=$a-$inc;
$ans=int(10^$inc);
}
\end{question}
\end{topic}

However, I get the following error during latex conversion:

## ODEs with pertuabutions at specific time...

Maple
Dear All, I have two odes, dX/dt = -X(t)*Y(t) and dY(t)/dt = X(t)*Y(t) I can solve these numerically using the following code: eq_1:=diff(X(t), t)=-X(t)*Y(t); eq_2:=diff(Y(t),t)=X(t)*Y(t); IC:={eq_1, eq_2,X(0)=10,Y(0)=1}; F:=dsolve(IC, {X(t),Y(t)},type=numeric, method=rosenbrock); h := theta->eval(X(t),F(theta)); h(1); However, I would like to add perturbations at specific time points. For example, at t=10, set X=5, or at t=15, Y=0. How should I do this in maple? Note: my actual situation involves a 100 odes. Thanks, Colin

## Summations involving 0^n...

Maple
Dear All, I seem to be having trouble with 0^n in maple, can someone help? Essentially, I have a complex function that simplifies under certain conditions to
f:=1.*0.^n/factorial(n);
but
sum(f,n=0...0);
gives 0. Whereas,
evalf(subs(n=0,f));
gives 1. Any ideas? Thanks Colin
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