first_order_error.mw

hi.please see attached file and explain how i remove error

thanks alot

mid_point.mw

hi i a have a problem with program which attached..please help me

thanks alot

dsys3 := {(diff(w(x), x, x, x, x))/x^2 = .4/(x^3*(1-w(x))^3)+40*(1+.65*(1-w(x)))/(x*(1-w(x))^2), w(0) = 0, w(1) = 0, ((D@@1)(w))(0) = 0, ((D@@1)(w))(1) = 0}

dsol5 := dsolve(dsys3, numeric, output = array([.5]))

Error, (in dsolve/numeric/bvp) system is singular at left endpoint, use midpoint method instead

  restart: with(plots):
  H := a -> piecewise(a>=0,1):
  f1 := y->(H(y-1*Pi)-H(y-2*Pi))*sin(y)^2:

  g1:=(f1(y)/sqrt(4*Pi*t))*(sin((x-y)^2/4/t+Pi/4)-sin((x+y)^2/4/t+Pi/4)):
  g2:= int(g1, y= 0..100):

  g3:= diff(g2,t):
  g4:= diff(g2,x$2):
  g5:= (g3^2+g4^2)/2:
  E2:= unapply(Int(g5, x= 0..100, epsilon= 1e-4, digits= 7), t):
  CodeTools:-Usage( plot(E2, 0..20, numpoints= 50, labels= [t, E]));

The above mentioned code should give constant figure, but it takes a lot of time and not accurate.

If you can help me to improve these codes, I would be pleased.

Thanks!

dear all

how Matrix(2, 2, [a,b,c,d]) change to:

a b

c d  

without [] !

Elast2.mw

i recall having asked this question before and having received answers which unfortunately I cannot locate.

I wish to generate a sequence like
    a[1], b[1], a[2], b[2], a[3], b[3]

The following does not work for the obvious reason:

    seq(a[i], b[i], i=1..3);

What is the right way?

Let a piecewise-linear curve be defined by a listlist. For example,

LL := [[1.1, 2.04], [1.97, 4.04], [2.96, 2.97], [4.5, 6.4], [5.08, 7.21], [1.1, 4.04], [1.1, 2.04]]:
plot(LL);

How to find its natural parametrization in Maple? A procedure is desired. See Wiki for info.

Hi everyone.

I have been experiencing a problem trying to solve a coupled system of 3 differencial equations

My problem is that a got a message back as I try to solve the system:

"Error, (in pdsolve/numeric/process_IBCs) improper op or subscript selector"

by apply this point that ''all dependent variables must be functions of the same independent variables''

i again accost with another error ''

Error, (in pdsolve/numeric/process_IBCs) initial/boundary conditions can only contain derivatives which are normal to the boundary, got (D[1, 1](w))(x, -3/400000000)

''

please help me.....very very thanks

Here the potential of maple 2015 to the quantitative study of the decomposition of a vector table is shown in two dimensions. Application for the exclusive use of engineering students, which was implemented with embedded components.

Atte.

Lenin Araujo Castillo

Archivo Corregido:  Decomposición_Vectorial_Corregido.mw

I wish to display the following screen output from a procedure A(), in a textbox of mathcontainer or any other suitable component.

This output to screen listing is generated by print statements in the procedure A().

I have placed the procedure call A() in a textbox and then am using a button component to execute it with the objective of displaying the above output in another component display box; either a textbox or a MathContainer box...  I can see that A() executes, but do not know how to get the result to display in a component box.

Can anyone offer any help?

hi.may  help me for solve this nonlinear equations by numeric solver maple39.d39.pdfocx39.pdf

thanks alot

file format is pdf and word type

and show whether there is sink or source?

ode1:=a(t)*(diff(a(t), t))+c(t)*(diff(c(t), t))=3*t;
ode2:=a(t)*(diff(a(t), t))+a(t)*(diff(a(t), t))*b(t)*(diff(b(t), t))*c(t)*(diff(c(t), t))=3*t;
ode3:=a(t)*(diff(a(t), t))+a(t)*(diff(a(t), t))*c(t)*(diff(c(t), t))+a(t)*(diff(a(t), t))*b(t)*(diff(b(t), t))*c(t)*(diff(c(t), t))=2*t;

DEtools[DEplot3d]({ode1,ode2,ode3},[a(t),b(t),c(t)],t=0.5..1.4,a=0..1.4,b=0..1.4,c=0..1.4,[[a(1)=1,b(1)=2,c(1)=3]],scene=[a(t),b(t),c(t)], arrows=medium);

unable to convert to explicit first order system, do not understand this error message

Hi!!

I'm trying to define a function by a definite integral. For this, first we define the following  procedure

and the map

So, for a given m, my desired  "function" should be fun(curva(m,t)). The problem here, is that this function not work because, for instance, for m=2 the command fun(curva(2,t)) returns the below expession, which i think is wrong (where is the expression on "sin" or "cos(2*Pi*t)" ???)

Somebody can help me??

Thanks!!!

Hello!

Is it possible convert some equations in R² (ellipse, hyperbola) to polar coordinates using Maple? And a regular  object in R³ like a sphere, a cylinder or a cube could be converted from cartesian coordinates to polar coordinates?

Thank you so much.

Hi everybody,

i'm trying to do an elliptic regularization but i don't know how to proceed ?

Is someone know how to achieve to do that  with an example ?

thanks a lot !

PS: i know only how to do a linear regularisation.