## 652 Reputation

16 years, 279 days

## second attempt...

I was able to reproduce the problem and a work around as follows:

restart; Digits := 20;
104/Pi^4;
evalf(%);
identify(%);
convert(%%%,rational);

It does seem that identify has problems, but convert(x, rational) works.

J. Tarr

## seems OK...

Try this:

restart;
Digits:=20;
identify(evalf(k/Pi^4));
seq( eval(%,k=i),i=100..110);

Hope this helps

J. Tarr

## seq...

The command seq is more efficient than a for loop.  Try this:

restart;
L:=[1,3,5,6];
seq( sqrt(5*L[i]- L[i+1]),i=1..nops(L)-1);

Hope this helps.

J. Tarr

## Help pages...

Please see ?Statistics,TallyInto, ?Statistics,FrequencyTable, ?Statistics,FrequencyPlot and ?Statistics,KernelDensity.

Hope this helps,

J. Tarr

I hope that you are not asking people here to breach a copyright.

J. Tarr

## Optimization...

You may be able to do what you want with non-linear programming in the Optimization package. Please see ?Optimization[NLPSolve].

Good luck.

J. Tarr

## subs or eval...

John,

You could try this:

restart;
A := <<u,v,w>|<x,y,z>>;
B := eval(A,{x=a,y=b,z=c});

or

subs(x=a, y=b, z=c,A);

Hope this helps.

J. Tarr

Elaine,

J. Tarr

## Matrix...

John,

Please see ?Matrix and ?LinearAlgebra,General,MVshortcut(Matrix). Your difficulty is not so much Inverse, but constructing a Matrix, eg M:= [[1,3],[2,5]] assigns a listlist to M.

Hope this helps,

J. Tarr

## implicitplot...

Allan,

Please see ?implicitplot and the two examples with the filledregions option. They are not limited to the region bounded by the Ox axis. You might get something closer to your needs by using the coloring and color options with the filledregions option.

Hope this helps,

J. Tarr

Gernot,

Here's an example of using readdata to read in part of your text file, assuming that its Windows path is C:\Maths\Maths11 and its name is example.txt

restart;
[[1, 15.0000, 112.0000], [2, 15.0003, 146.0000], [3, 15.0006, 114.0000],

[4, 15.0008, 134.0000], [5, 15.0011, 66.00000], [6, 15.0014, 110.0000],

[7, 15.0017, 137.0000], [8, 15.0019, 60.00000], [9, 15.0022, 92.00000],

[10, 15.0025, 52.00000]]

Hope this helps

J. Tarr

Gernot,

Hope this helps.

J. Tarr

## Allan, Take a look at...

Allan,

Take a look at ?plots[implicitplot] and the option filledregions, together with the two  examples that show this option. Is this what you need?

Hope this helps.

J. Tarr

## Assignments...

Jamie,

When you've got a worksheet that tries to solve the problem, upload it and ask for help with using Maple.

Good luck,

J. Tarr

## Ordinary Differential Equations...

Nevulosa,

Please see the help pages at ?diff and ?dsolve.  If I have understood you correctly, this will solve your problem:

restart;
deq := diff(v(t),[t\$2]) + diff(v(t),t) +v(t) = 0;
dsolve(deq,v(t));

You will note that the solution contains two arbitrary constants, _C1 and _C2.  You will have to find these from the initial conditions of your problem.

Hope this helps,

J. Tarr

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