Solving the system

 a1 := 2*x2-x3-x4-x5-x6-x7;
 a2 := -2*x1+2*x3-x4-x5-x6-x7;
 a3 := x1-2*x2+2*x4-x5-x6-x7;
 a4 := x1+x2-2*x3+2*x5-x6-x7;
 a5 := x1+x2+x3-2*x4+2*x6-x7;
 a6 := x1+x2+x3+x4-2*x5+2*x7;
 a7 := x1+x2+x3+x4+x5-2*x6; b := x1+x2+x3+x4+x5+x6+x7;
 solve({x1 >= 0, x2 >= 0, x3 >= 0, x4 >= 0, x5 >= 0, x6 >= 0, x7 >= 0,
 b = 1, a1 <= 0, a2 <= 0, a3 <= 0, a4 <= 0, a5 <= 0, a6 <= 0, a7 <= 0},...

Are there naming conventions or requirements for uploaded files?

I am used to using something like "name.rlm.xx.yy.Mvv.mw" with spaces as appropriate in the name. xx.yy is my version, because I save many versions as I go along. Mvv is the Maple version.

Are there some names that MaplePrimes will not handle correctly, aside from length?

Though I have been a casual Maple user since M12, I really don't know how to use it well, and am just learning it. I set myself a few tasks to help me discover its potential. I find that I learn better if I have some goal, even if it is just a sample goal.

In the accompanying file, I want to see how to use M14, and explore how to use Legendre polynomials.

Q: In (3.4), is there a cleaner way to declare the sequence?

Q: Am I using sequences correctly in this file?

I am trying to duplicate the material that is shown in the accompanying PDF file, where the plot actually comes from the calculations, much as I am trying to do with Maple 14.

Q: (3.9) gets the correct coefs, but not very pretty...is there a better way?

Q: I eventually stumbled upon (3.10), which looks correct, but when I dragged it to the plot and dropped it, I got only the first Legendre polynomial, not n of them. How do I get that?

Q: How do I show that I dropped L on the plot? The legend shows Curve 1 and 2.

Q: Is there a way to combine (3.8) and (3.9) into one stem, for example, by using array subscripts? I tried and failed.

Legendre_polynomial_.mw

Legendre_polynomial_.pdf

So Im doing a curve againist data plots for angular freq,

Ive reached the stage where im trying to evaluate the function,

ive put

>fit :=eval(f(x),R[2]);

where R[2] is the the values for the constants, in the function

F/sqrt(m^2*(omega^2-omega_0^2)^2+b^2*omega^2

which is also defined as f(x)

how can I find the average of numberrs in a list. For example, I want to find the average of [4,6,8]. Thanks!

12345123.msim

Hello,

I use maplesim to simulate a very simple circuit, and want to obtain voltage of a resistor, so I check the voltage of  Probe block, but get nothing. I upload my document.

I'm a beginner in maplesim, can you give me some advices?

Hi:

I have a number of functions all enclosed inside the Sum functionin the  following form:

Test:=Sum(f1(n)+f2(n)),n=1..infinity);

Each of the functions f1, etc are fairly complicated, and there are more than two, but this example will do.

How do I get Maple to expand Test into the form:

Test:=Sum(f1(n),n=1..infinity) + Sum(f2(n),n=1..infinity);

I've tried every combination of expand, simplify, combine collect, that I can think of - nothing works.

How can I apply the function sin(x) to a list of numbers [4,6,Pi]? Thanks in advance!

Hey folks and (almost) Merry Christmas!

How do I check if a number is a permutation of another number (doesn't have to be a cyclic one though)

E.g...

Let x = 123456789

How would I test to see that, for example, 847591236 is a permutation of x without generating every permutation of x?

I feel there should be an obvious command for this but I can't seem to find any...

I'd like to add the summation with just the index below, not the i=1..n form, but Help seems to say that I can only expressions and entities from other palettes...

I found a minor error in Help...

Hello,

it's my first utilisation of MAPLE, and I want to determine the max of a function y(x). I have this differentiel equation with 2 variables :

a*diff(y(x),x,x) + b*(diff(y(x),x)-diff(z(x),x)) + c*diff(y(x),x) + d*y(x) + e*(y(x)-z(x))= 0;

I resolve it whith the function "dsolve", and now and I want to calculat the max of the function y(x).

can any body help me ??!!!

thanks

The original function is 6x^2+5x-4/2x^2-7x-4. The equation of the line which is tangent to the curve at the point (0,1) is -12/35x - 1/35. Is this correct? I used the command Tangent(f(x),x=-3). The equation of the line which is normal to the curve at the point (-3,1). is 35/12 + 39/4 . Is this correct?

I thought that I'd help out another poster, so I clicked on the .mw link and got (r-click as usual) a download of an aspx link, or (clicking the link) a blank web page.

I'm trying to reproduce the following graph:

http://upload.wikimedia.org/wikipedia/commons/thumb/2/22/HarmonicNumbers.svg/600px-HarmonicNumbers.svg.png

I have got this far:

N:=10:
theHarmonicNumbersPlot := plot([seq([n,sum(1/i,i=1..n-1)-gamma],n=2..N)],style=point, colour=red):
theHarmonicFunctionPlot := plot(Psi(n), n=2..N, colour=black):
plots:-display([theHarmonicFunctionPlot,theHarmonicNumbersPlot]);

But my plot is missing the horizontal...