Mariner

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15 years, 149 days

MaplePrimes Activity


These are answers submitted by Mariner

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

Try this:

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

Hope this helps

J. Tarr

 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

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

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

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,

Please see ?argument.

J. Tarr

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

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;
readdata("C:\\Maths\\Maths 11\\example.txt",[integer,float,float]);
 [[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,

Please see ?readdata.

Hope this helps.

J. Tarr

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

Jamie,

Everyone here will be very glad to help you to use Maple, but not with doing your assignments. Your tutor set your assignment to get you learn about a specific topic. If you are stuck, ask your tutor, or you could try en.wikipedia.org/wiki/Partial_differential_equation

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

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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