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vuishl

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15 years, 63 days
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These are questions asked by vuishl

Nested loop is not executed, at least no...

vuishl 103 Maple
loop
May 21 2010
2 1

Seems that I don't know how to organize a nested loop.

Simple example:

for i by 2 to 19 do

for k from 2 to 26 do

A := i*k

end do

end do

Nothing is returned here (when I expected a list of different values for A).

___________________

How to draw many plots (that are drawn i...

vuishl 103 Maple
plot
May 19 2010
1 0

Hi everyone.

For example, I have

...

plo[i] := plot([u[i](t), v[i](t), t = k[i] .. k[i+1]])

...

Now I want to draw all these plots on the same picture:

with(plots):display([plo[1],plo[2],plo[3],..........................................]);

How can I place all plots in brackets? Number of iterations varies, and there are a lot of sets of iterations, so I need a universal way to do it.

Tried to use Array() but didn't suceed.

Thanks for help!

Approximation causes a problem in my loo...

vuishl 103 Maple
May 16 2010
0 0

Hi everyone.

I have a loop in which initial data of ODE is found on every iteration and is substituted to find new solution. The system is striking 1 or -1 and x'(t) changes its sign, to -x'(t)

I do it this way (k[i] stands for the values of time t):

Approximation causes a problem in my loo...

vuishl 103 Maple
May 16 2010
1 0

Hi everyone.

I have a loop in which initial data of ODE is found on every iteration and is substituted to find new solution. The system is striking 1 or -1 and x'(t) changes its sign, to -x'(t)

I do it this way (k[i] stands for the values of time t):

Cannot substitute initial data (in ODE) ...

vuishl 103 Maple
assign error
May 07 2010
1 3

In my system initial data is changed on every iteration. I find new equation, then find when some condition is met, calculate new initial data and go on with it. But there are errors in the very beginning.

Example:

ODE := diff(diff(x(t), t), t)+.2*(diff(x(t), t))-x(t) = 0.8*sin(t)
t[1] := 0;
ics[1] := x(t[1]) = .2, (D(x))(t[1]) = 5
X[1] := dsolve({ODE, ics[1]})

I encounter two problems:

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