## 89 Reputation

15 years, 30 days

## 2nd order ODE system...

Maple 14

Hi everyone,

I have a 2nd order system which I want to solve. But the solver outputs no results after evaluation, just returns to the prompt. Do you know what I am doing wrong?

deq1:=diff(x[1](t),t\$2)=k[1]/abs(x[2](t)-x[1](t))^2;
deq2:=diff(x[2](t),t\$2)=k[2]/abs(x[2](t)-x[1](t))^2;
sys_ode:=deq1,deq2;
ICS:=x[1](0)=5, x[2](0)=10, D(x[1])(0)=0.1,D(x[2])(0)=0.2;
dsolve({sys_ode, ICS});

thanks.

## Missing Print Preview and PDF Export...

Maple 14

sorry for this funny question, but where is the "Print Preview" command, it is not under File menu anymore and the export to PDF function is also missing... What am I doing wrong?

running Maple 14 under Max OS X, SL.

cheers.

:-)

## Display Fractions...

Maple 14

Hi,

imagine I have the following line:

(y/2)*(4/3)*sin(x);

can I tell Maple not to merge everything together? I want to have it all seperated, like a separate fraction for y/2 another for 4/3 and then comes the sine, with small spaces between them, indicating multiplication.

thanks.

## Black brackets in 1-D math input...

Maple

Hi everyone,

how do I turn off the black brackets at the beginning of each line in 1-D maple math input? i.e. instead of "[>" only ">" at the beginning of each line?

thanks.

## Unit Command...

Maple

Hi everyone,

when I use:

c:=2e-6*Unit(A*s/V);

then maple answers with the unit [F]. but when I use:

epsilon[0]:=8.85e-12*Unit(A*s/V/m);

then in the middle of a large document, Maple (Version 12) ignores [m] and still gives me [F]. On a blank (new) document the same command results in correct units [m^-3 kg^-1 s^4 A^2]. The behaviour is reproducible.

anyone knows why?

cheers :-)

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