Unanswered Questions

This page lists MaplePrimes questions that have not yet received an answer

So i got this code, im trying to iterate with jacobi and gaussseidel method.

H := HilbertMatrix(n, n, 1); b := Matrix(n, 1, proc (i) options operator, arrow; add(1/(i+j-1), j = 1 .. n) end proc); A := Matrix(n, 1, 1); Multiply(H, A); norm1H := norm(H, 1); norm2H := norm(H, 2); normHinf := norm(H, infinity); norm1b := norm(b, 1); norm2b := norm(b, 2); norminfb := norm(b, infinity); IterativeApproximate(H, initialapprox = Vector(n, 0), tolerance = 10^(-7), maxiterations = 10, method = gaussseidel)

 

But sadly no iteration gave me an answer, anyone knows wheres my mistake? i really help with this! 


thanks in advance

I wish to apply several i-j constraints to an optimization problem that involves minimizing a function x[i,j]. 

Does anyone know of a simple way to exclude values for i and j? For instance, how do we specify the conditions, i not equal to j, i is not equal to 1, etc.?

Thanks in advance!

 

 

Hello.

I've just installed Maple 2015 and when I started it, this happened

It seemed that something was wrong with the graphics or java. But I really don't know what to do next.

Please help me, thank you.

Friends

I have plotted some figures and saved them yesterfay!

now once i opened them some nonsence digits appear on the figure! see the picture please. anyone has similar experience? how to solve it!

Dont make me disappointed maple! two days work is invain now !

 

> restart;
> with(plots); with(StringTools); with(plottools);
> INF := 999999999999999999999;
                     999999999999999999999
> NULL;
> MinoxAngle := 200; MikromaAngle := 350; MinicordAngle := 290; GamiAngle := 280; GamiFocal := 0.25e-1; SummitarDial := [1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2, 2.2, 3, 4, 5, 6, 7, 10, 20, INF]; Minox35MLDial := [3, 4, 6, 10, 20, INF]; Minox35Angle := 100; MinicordDial := [.35, .4, .5, .6, .7, .8, .9, 1, 1.2, 1.5, 2, 3, 4, 8, INF]; Mini := nops(MinicordDial); MikromaDial := [.5, .6, .7, .8, .9, 1, 1.2, 1.5, 2, 2.5, 3.5, 6, INF]; MinoxLXDial := [.2, .24, .3, .4, .6, 1, 2, 30]; MinoxLXAngle := 270; GamiDial := [.5, .6, .7, .8, 1, 1.2, 1.5, 2, 3, 5, 99990000000000]; MinoxBDial := [8*(1/12), 10*(1/12), 1, 1.5, 2, 3, 6, INF]; MinoxBAngle := 270;
                              200
                              350
                              290
                              280
                             0.025
[1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 2, 2.2, 3, 4, 5, 6, 7, 10, 

  20, 999999999999999999999]
            [3, 4, 6, 10, 20, 999999999999999999999]
                              100
 [0.35, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 2, 3, 4, 8, 

   999999999999999999999]
                               15
    [0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 2, 2.5, 3.5, 6, 

      999999999999999999999]
              [0.2, 0.24, 0.3, 0.4, 0.6, 1, 2, 30]
                              270
   [0.5, 0.6, 0.7, 0.8, 1, 1.2, 1.5, 2, 3, 5, 99990000000000]
         [2  5                                        ]
         [-, -, 1, 1.5, 2, 3, 6, 999999999999999999999]
         [3  6                                        ]
                              270

> NULL;
> dd := GamiDial; N := nops(dd); dstx := [seq(convert(dd[i], string), i = 1 .. N)];
   [0.5, 0.6, 0.7, 0.8, 1, 1.2, 1.5, 2, 3, 5, 99990000000000]
                               11
  [".5", ".6", ".7", ".8", "1", "1.2", "1.5", "2", "3", "5", 

    "99990000000000"]
> NULL;
> MinicordAngle := 290;
                              290
> NULL;

> LensDial := proc (LensName, focal, Angle, scale, dr) local p1, p2, p3, p8, pk, pt, rk, R, R2, R3, Rc, c1, ds2; R := 1600; R2 := 1400; R3 := 1200; Rc := 1500; CaptionTail1 := "EXTENSION ANGLE"; CaptionTail2 := "LENS FOCUSING DIAL"; Caption1 := Join([LensName, CaptionTail1]); Caption2 := Join([LensName, CaptionTail2]); q := 180/Pi; rotation := 90; dir := dr; ds := scale; N := nops(ds); dstx := [seq(convert(ds[i], string), i = 1 .. N)]; ds2 := subs(dstx[N] = infinity, dstx); MaxAngle := Angle; f := focal; degr := -(-ds[1]+f)*Angle/(D-f)+rotation; g1 := degr/q; for j to N do deg[j] := subs(D = ds[j], degr) end do; for i to N do rdn[i] := evalf(deg[i]/q); xv[i] := R2*cos(rdn[i]); yv[i] := R2*sin(rdn[i]); wx[i] := R3*cos(rdn[i]); wy[i] := R3*sin(rdn[i]) end do; pk := {seq([ds[i], deg[i]], i = 1 .. N)}; rk := {seq([dir*xv[i], yv[i]], i = 1 .. N)}; txt := {seq([dir*wx[i], wy[i], ds2[i]], i = 1 .. N)}; p3 := pointplot(rk, caption = Caption2, captionfont = ["ROMAN", bold, 22], symbol = solidcircle, symbolsize = 15, color = red, axes = none); c1 := circle([0, 0], Rc, thickness = 8); p8 := textplot(txt, 'font' = ["times", "bold", 14]); display(p3, c1, p8, scaling = constrained) end proc;
Warning, `CaptionTail1` is implicitly declared local to procedure `LensDial`
Warning, `CaptionTail2` is implicitly declared local to procedure `LensDial`
Warning, `Caption1` is implicitly declared local to procedure `LensDial`
Warning, `Caption2` is implicitly declared local to procedure `LensDial`
Warning, `q` is implicitly declared local to procedure `LensDial`
Warning, `rotation` is implicitly declared local to procedure `LensDial`
Warning, `dir` is implicitly declared local to procedure `LensDial`
Warning, `ds` is implicitly declared local to procedure `LensDial`
Warning, `N` is implicitly declared local to procedure `LensDial`
Warning, `dstx` is implicitly declared local to procedure `LensDial`
Warning, `MaxAngle` is implicitly declared local to procedure `LensDial`
Warning, `f` is implicitly declared local to procedure `LensDial`
Warning, `degr` is implicitly declared local to procedure `LensDial`
Warning, `g1` is implicitly declared local to procedure `LensDial`
Warning, `j` is implicitly declared local to procedure `LensDial`
Warning, `deg` is implicitly declared local to procedure `LensDial`
Warning, `i` is implicitly declared local to procedure `LensDial`
Warning, `rdn` is implicitly declared local to procedure `LensDial`
Warning, `xv` is implicitly declared local to procedure `LensDial`
Warning, `yv` is implicitly declared local to procedure `LensDial`
Warning, `wx` is implicitly declared local to procedure `LensDial`
Warning, `wy` is implicitly declared local to procedure `LensDial`
Warning, `txt` is implicitly declared local to procedure `LensDial`
> ;
> NULL;
> LensDial("MEOPTA MICROMA  HELGOR 25mm", 0.25e-1, 350, MikromaDial, 1);

> LensDial("GOERZ MINICORD  25mm", 0.25e-1, 335, MinicordDial, 1);


> ;
> LensDial("MINOX LX MINOX 15mm", 0.15e-1, 270, MinoxLXDial, 1);

> LensDial("GAMI ESAMITAR 25mm", 0.25e-1, 290, GamiDial, 1);

I have not been using Maple for the last couple of years because I have Maple installed on my big and heavy laptop. Such laptop forces me to sit at a desk when I work which I dont like. This has resulted in that I have only (for the most part) used my ipad for the last couple of years hence dropping my laptop and Maple. The problem with such approach has been that is more difficult to write scientific papers because you cant run a full version of word on the ipad hence you cant use a citation manager. There does not exist an app on the ipad that offer one. This leads to a lot of extra work!

I have therefore now bought a Microsoft Surface Pro 4 which is a tablet (like the ipad) but its a not a "toy" tablet like the ipad or android tablets because it has Windows 10 Pro (64-bit) which means that you can run full versions of pc software like word 2016 and Maple. The version of Surface Pro 4 I bought has an Intel Core m3-6Y30 processor with 2 cores, 4GB RAM, 128 GB of storage, no fan and a processor base frequency of 0.9 GHz. The m3-6Y30 processor has something called dynamic frequency scaling which means (as I understand it) that the processor can go up to 2.2 GHz when it is under heavy load. Since Maple recommend that you have a system with a cpu with at least 1 GHz to run Maple 2016 I am not anticipating any problems here.

http://www.maplesoft.com/products/system_requirements.aspx

However, I am not completly sure if maplesoft means that the base frequency needs to be 1 Ghz or not? Since my tablet has not been delivered yet I cant comment on how Maple runs on it but as I said I am not anticipating any problems.

Now to my question: When will Maple 2017 come out? Since it is already 2017 I dont want to buy an old version of Maple now that I want to update my Maple software.

Hi,

I have a second order, linear, non-homogeneous differential equation and for the solution Maple takes the particular solution under a indefinite integral form. After I substitute the values of the coefficients I want Maple to perform the integration. The integration is possible because I individually integrated one small part of the expression. The full expression has a lenghty sumation of different indefinite integrals so it would be cumbersome to perform each integration by hand.

Can somebody help me force Maple to perform these integrations?

I already tried eval, evalf, simplfy and it doesn't work.

Thanks a lot.

hi

why this equation does not any answer?

thanks

s-s.mw
 

restart

``

eq:={-J*g[1]*(diff(w(x), x, x, x, x, x, x))+J*c[1]*(diff(w(x), x, x, x, x))+A*g[113113]*(diff(w(x), x, x, x, x))+(beta[11]*A*0)*`ΔT`*(diff(w(x), x, x))+2*b*f[1133]*(Pi/L)^2*(d[33]*lambda[3]*`ΔT`*L/mu[33]-2*f[1133]*a*Pi/L-P[3]*`ΔT`*L)*sin(Pi*x/L)*sinh(h*Pi/(2*L))/(2*cosh(h*Pi/(2*L))*(-a33+d[33]^2/mu[33])) = 0, w(0) = 0, w(L) = 0, (D(w))(0) = 0, (D(w))(L) = 0, ((D@@3)(w))(0) = 0, ((D@@3)(w))(L) = 0}

{-J*g[1]*(diff(diff(diff(diff(diff(diff(w(x), x), x), x), x), x), x))+J*c[1]*(diff(diff(diff(diff(w(x), x), x), x), x))+A*g[113113]*(diff(diff(diff(diff(w(x), x), x), x), x))+b*f[1133]*Pi^2*(d[33]*lambda[3]*`ΔT`*L/mu[33]-2*f[1133]*a*Pi/L-P[3]*`ΔT`*L)*sin(Pi*x/L)*sinh((1/2)*h*Pi/L)/(L^2*cosh((1/2)*h*Pi/L)*(-a33+d[33]^2/mu[33])) = 0, w(0) = 0, w(L) = 0, (D(w))(0) = 0, (D(w))(L) = 0, ((D@@3)(w))(0) = 0, ((D@@3)(w))(L) = 0}

(1)

dsolve(eq, w(x))

``


 

Download s-s.mw

 

http://www.maplesoft.com/applications/view.aspx?SID=4229

from book example, it seems assumed that input size of data such as list size or matrix size is the same as

trained data set size, but this need to hard code infinite number of types of size

What is the method to programming neural network when input size is smaller or changing and not equal to size of trained data set?

Hi guys,

I run my code and after a point all the numerical values are followed by a dot. Why is that? Also the symbolic variables have a 1. before them.

Thanks a lot!

When I click on http://www.mapleprimes.com/   I get this message 

 

And this has been the case for few days now. But only now I can see I can access the site if I know the internal sub link to it.  

So why is the main page down for so long?

Hello! Hope everyone would be fine. I want to solve the following system of ODEs please help to find the numerical solution

N := .6; alpha := .4; beta := .1; Nt := .2; Pr := .5; Nb := .1; s := .2; lambda[1] := 1; delta := .5; gm := 1; Sc := 1:L:=1:

Eq1 := (alpha*s+1)*(diff(F(eta), eta, eta, eta))-(F(eta)+(1/2)*s*eta)*(diff(F(eta), eta, eta))+((1/2)*(diff(F(eta), eta))-s)*(diff(F(eta), eta))-2*(G(eta)^2-(1-gm)^2)-2*lambda[1]*(H(eta)+N*Y(eta))-(alpha+beta-(1/4)*delta*(diff(F(eta), eta, eta, eta)))*(diff(F(eta), eta, eta))^2-(alpha-2*beta)*(diff(F(eta), eta))*(diff(F(eta), eta, eta, eta))-(2*(alpha-beta-(1/4)*delta*(diff(F(eta), eta, eta, eta))))*(diff(G(eta), eta))^2-(2*(alpha-(1/4)*delta*(diff(F(eta), eta, eta))))*G(eta)*(diff(G(eta), eta, eta)) = 0; Eq2 := (alpha*s+1)*(diff(G(eta), eta, eta))-F(eta)*(diff(G(eta), eta))+G(eta)*(diff(F(eta), eta))+s*(1-gm-G(eta)-(1/2)*eta*(diff(G(eta), eta)))-(1/2)*alpha*s*eta*(diff(G(eta), eta, eta, eta))+((3/2)*alpha+beta)*G(eta)*(diff(F(eta), eta, eta, eta))-((1/2)*alpha+beta)*(diff(F(eta), eta))*(diff(G(eta), eta, eta))-delta*((diff(F(eta), eta, eta))^2+6*(diff(G(eta), eta))^2)*(diff(G(eta), eta, eta)) = 0; Eq3 := (diff(H(eta), eta, eta))/Pr-F(eta)*(diff(H(eta), eta))+(1/2)*H(eta)*(diff(F(eta), eta))-s*(2*H(eta)+(1/2)*eta*(diff(H(eta), eta)))+Nb*(diff(H(eta), eta))*(diff(Y(eta), eta))+Nt*(diff(H(eta), eta))^2 = 0; Eq4 := (diff(Y(eta), eta, eta))/Sc-F(eta)*(diff(Y(eta), eta))+(1/2)*Y(eta)*(diff(F(eta), eta))-s*(2*Y(eta)+(1/2)*eta*(diff(Y(eta), eta)))+Nt*(diff(H(eta), eta, eta))/Nb = 0;

IC1 := F(0) = 0, (D(F))(0) = 0, G(0) = gm, H(0) = 1, Y(0) = 1; IC2 := (D(F))(L) = 0, G(L) = 1-gm, (D(G))(L) = 0, H(L) = 0, Y(L) = 0; dsys1 := {Eq1, Eq2, Eq3, Eq4, IC1, IC2}; dsol1 := dsolve(dsys1, numeric, output = listprocedure, range = 0 .. L);

dsol1f := subs(dsol1, F(eta));

dsol1g := subs(dsol1, G(eta)); dsol1h := subs(dsol1, H(eta)); dsol1y := subs(dsol1, Y(eta));

With my best regards and sincerely.

Hi,

Seem to be a bit stuck. Here's my code:
 

Thanks in advance :-) 

Hi!

Everyone,

I want to draw  phase plane of system of three fractional order equations. 

 

Note that 

Also want the  phase portrait when the values of alpha are not same....

Also

Thanks

 

 

 

Friends in Maple

I have a Vehicle Routing Problem I wish to cast as a integer model. VRP is a kind of TSP and knapsack problem hybrid  I would be grateful if someone can finish it. answers included. This isn't homework BTW.

VRP_IP.mw

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