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I'm having a problem with my student work, about to have a solution of 6 equations... Can help me in this file? i dont know how to solve this... this had-me a null solve...



Thanks for the help =)


M1 := 0.15e5;





















`σadm` := 175*10^6;







Atria := (3.5*12)/(LBC+LCD)



Ctria := LAB+LBC+(1/3)*(2*(LCD+LDE))



AiXil := Atria*Ctria



C := AiXil/Atria






SumFX := FAx;



SumFY := FAy+FCy+FEy-F5-QTria;



SumMA := FCy*(LAB+LBC)-F5*(LAB+LBC)+FEy*(LAB+LBC+LCD+LDE)+M1-MA-QTria*Ctria;






EIYac := EIYo+`EIθo`*x+M1*(x+0)^3/factorial(3);



EIYce := EIYac+FCy*(x-4)^3/factorial(3)-F5*(x-4)^3/factorial(3)-q5*(x-4)^5/((3.5)*factorial(5));



EIYef := EIYce+FEy*(x-7.5)^3/factorial(3)+(1/3)*q5*(x-7.5)^5/factorial(5);



`EIθac` := diff(EIYac, x);



`EIθce` := diff(EIYce, x);



`EIθef` := diff(EIYef, x);




Mac := diff(`EIθac`, x);



Mce := diff(`EIθce`, x);



Mef := diff(`EIθef`, x);




Vac := diff(Mac, x);



Vce := diff(Mce, x);



Vef := diff(Mef, x);




x := 0:

`EIθo` = 0


EIYo = 0


x := 4:



x := 7.5:



SOL := solve({CF1, CF2, CF3, CF4, SumFY, SumMA}, {EIyo, FAy, FCy, FEy, MA, `EIyθo`});








Dear Maple users

I am delighted that Maple has builtin commands to plot so many polyhedrons in 3D. Here I am talking about the polyhedraplot command in the plots package. I was however disappointed that the socalled Truncated Icosahedron is not supported (not present in the supported list ...). My first question is:

1. Why isn't it supported?

It seems more relevant than many of the other polyhedrons which are supported. It is a member of the Archimedian Solids (see Besides it is the basic structure for soccer footballs. I found out that a TruncatedIcosahedron command is available in the geom3d package. This command is able to deliver data for the faces and more. With this command I succeded in writing a small program to actually plot this polyhedron in 3D:



    local i::integer,
    for i from 1 to 32 do
    end do;
end proc:



Since I am not really experienced in programming in Maple, here is my last question:

2. Can I simplify something in my code above?


Best wishes,



People im with error to show a plot, this is a wor for universty about mechanic materials, and i'm with this error... do not show the plot... before, i've a error because the variable x has values, and i've to unassign to have this.. without unassign, has error in domin of the plot... i dont know how to do this ! And ive to send the work today. 

Someone can help me about this?

Value of variables:
plot algoritm...
plot algoritm

Thanks !

in page 137 of an introduction to groebner bases

how to eliminate the redundant solution (y^2-x*z, 0, -x^2+y*w)

from 3 of them?
eliminate({y,y^2-x*z,-z}, {x, y, z, w});
eliminate({-x,0,y}, {x, y, z});
eliminate({w,-x^2+y*w,-x}, {x, y, z, w});

ma := allstructs(Permutation([1, 1, 1, 2, 2, 2, 3, 3, 3]), size = 3);

above is fast

but below is very slow.
ma2 := allstructs(Permutation(ma), size = 3);

just for all combinations of matrix , replicateM in haskell is the fastest.

in maple, ma2 := allstructs(Permutation(ma), size = 3); is very slow


What is the best source of learning maple for an abecedarian to become a professional?


I can't understand difference between plots!

Please expailn it.


plot({sqrt(x+2*sqrt(x-1))+sqrt(x-2*sqrt(x-1)), sqrt(x-2*sqrt(x-1)), sqrt(x+2*sqrt(x-1))}, x = -3 .. 3)



Let us define a piecewise-linear continuous function:

restart; VP := Vector[row](16, {(1) = 10, (2) = 177.9780267, (3) = 355.9560534, (4) = 533.9340801, (5) = 711.9121068, (6) = 889.8901335, (7) = 1067.868160, (8) = 1245.846187, (9) = 1423.824214, (10) = 1601.802240, (11) = 1779.780267, (12) = 1957.758294, (13) = 2135.736320, (14) = 2313.714347, (15) = 2491.692374, (16) = 2669.670400}); VE := Vector[row](16, {(1) = 5.444193931, (2) = .4793595141, (3) = .3166653569, (4) = .2522053489, (5) = .2123038784, (6) = .1822258228, (7) = .1544240625, (8) = .1277082078, (9) = .1055351619, (10) = 0.8639065510e-1, (11) = 0.6936612570e-1, (12) = 0.5388339810e-1, (13) = 0.3955702170e-1, (14) = 0.2612014630e-1, (15) = 0.1338216460e-1, (16) = 0.1203297900e-2}); for i to 15 do p[i] := VE[i+1] < x and x <= VE[i], (VP[i+1]-VP[i])*(x-VE[i])/(VE[i+1]-VE[i])+VP[i] end do; g := unapply(piecewise(seq(p[i], i = 1 .. 15)), x);

for i to 15 do print(fsolve(g(x) = VP[i])) end do;

Why doesn't the fsolve command work if i = 4, 7, 9, 11, 14? There are workarounds:

print(DirectSearch:-SolveEqutions(g(x) = VP[i]));


VP := convert(VP, rational); VE := convert(VE, rational); print(solve(g(x) = VP[i]));

 How to explain such behavior of the fsolve command? That was asked but not answered in .


Edit. Replaced worksheet.


I have a problem with the adaptive question designer: when I use the multiple choice question type then occasionally parts of the question environment appear multiple times in the text, duplicating each time I reopen the question to edit. This happens in particular if the answers are a bit longer (4-5 lines each). So far I couldn't figure out how to fix this, does anyone have a similar problem? 

Many thanks for your help!

Please help me to solve this integration

restart; with(LinearAlgebra); int(exp(-(ln(z/(snr*B^2))+4*sigma^2)^2/(32*sigma^2))*eta^2*(y/z)^((1/2)*eta^2-1)/(z*sqrt(32*Pi*sigma^2)*(2*sqrt(y*z))*(2*A[o]^(eta^2))), z, z = y/A[o]^2 .. infinity);




restart; with(LinearAlgebra); int(exp(-(ln(z/(snr*B^2))+4*sigma^2)^2/(32*sigma^2))*eta^2*(y/z)^((1/2)*eta^2-1)/(z*sqrt(32*Pi*sigma^2)*(2*sqrt(y*z))*(2*A[o]^(eta^2))), z, z = y/A[o]^2 .. infinity)

Maple 2015:

simplify(1-2*sin(x)^2);  gives 2*cos(x)^2-1

I looked at help trying to understand why Maple thinks 2*cos(x)^2-1 is simpler than 1-2*sin(x)^2 but did not see it. I was expecting to see cos(2*x) as a result.

Is there a place to understand more Maple's simplification rules other than the help page?

I need to show that the following expression,

is positive

given that:

1. a,b,c,x,y,z are positive real numbers

2. a>b+x

3. c<b+y

I know a priori that the expression is indeed positive, but I do not know how to show it, or how to use Maple to do it?

Specifically, how can I use Maple to **partially factorize** the expression in terms of the expressions a-b-x and c-b-y?

Thanks for any help.

Can anyone tell me what is going on in the following worksheet? 



The following type  matches any second-or-higher-order derivative specified in D form with independent variables. You don't need to understand how this type works---which is, admittedly, convoluted---in order to understand the rest of this post.

                {'`@@`'(identical(D), posint),
                 And(specindex(posint, D), satisfies(D-> nops([op(D)]) > 1))


Here's an expression which is simply a sum of various types of derivatives. Note that the first and last terms only differ in the dependent variable name.

     D[1,2](u)(x,t) + diff(u(x,t), x, t) + diff(f(x),x$2) +
     diff(f(t),t) + (D@@3)(f)(x) + D(g)(x) + D[1,2](v)(x,t)

(D[1, 2](u))(x, t)+diff(diff(u(x, t), t), x)+diff(diff(f(x), x), x)+diff(f(t), t)+((D@@3)(f))(x)+(D(g))(x)+(D[1, 2](v))(x, t)

I1:= indets(expr, HODD);

{(D[1, 2](u))(x, t), (D[1, 2](v))(x, t), ((D@@3)(f))(x)}

The above result is as expected: Ds of order greater than 1 are selected; diffs are not. Now I try to extract the diffs also.


indets(expr, HODD &under (convert, D));

{diff(diff(f(x), x), x), diff(diff(u(x, t), t), x), (D[1, 2](v))(x, t), ((D@@3)(f))(x)}

The above result is missing D[1,2](u)(x,t) even though it contains the syntactically identical term D[1,2](v)(x,t)! Running trace  on `type/&under` shows that it never gets called for that missing term! So, the problem is not in &under. A further test shows that if the missing term is put elsewhere in expr (after restart, of course) then the indets works okay.


The following result is even weirder. One would expect that for any types T1 and T2 and any expression expr, that indets(expr, {T1, T2}) would equal indets(expr, T1) union indets(expr, T2), right? One would expect that even if there were a bug with one of the individual indets calls, right? So, note that I1 above contains the first term of expr, yet ...

indets(expr, {HODD, HODD &under (convert, D)});

{diff(diff(f(x), x), x), diff(diff(u(x, t), t), x), (D[1, 2](v))(x, t), ((D@@3)(f))(x)}

I get the same results if put the type explicitly in the indets calls rather than using AddType. I get the same results in Maple 16 and 18. So, what's going on?



I have created and saved a MAPLE module in an .mla archive. The module contains three procedures A, B, C, where

A calls, B and C.  

Once the module library has been loaded, A acccepts inputs and generates outputs.

Is it possible to create a MAPLE player worksheet which calls the module and share it with a Maple Player (only) user, so that they can then supply the inputs and observe the outputs from A using the Maple Player programme components?

Can anyone help?





Hi everybody:

I'm going to learn programming with maple 18, are there any good and new pdf files for learn it?

with regards...


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