Hello. It is required to find a solution of the boundary value problem by cubic b-spline collocation

We are looking for a solution in the form of a spline S(x). A cubic spline S(x) is represented as an expansion over normalized B-splines

Perhaps someone familiar with the method and can help implement the solution on Maple? I agree to any kind of cooperation. Really need help

Download badSums2.mw

Dears,

I have this file (of course it's not the real file):

input parameters
A := 5;
B := 6;
C := 7;

derived parameters
E := A*B;
F := cos(A)+e^B;
G := 265/C;
Parameters to be calculated
T := E^2+G-sin(F);
U := F+E-B;

I'd like to find a way for changing A, B, and C (for example giving them the values 1, 2, .. ,9) and getting a table (i mean a CSV or something else) with the values of T and U calculated for the different input values.

Do you know if it is possible?

And sorry if I wrote something wrong, it's my first post, and I'm not expert with Maple. I used it many years ago at the University, and now I'm trying to use it again.

I can type expression below:

s1 := sqrt(2);
                              (1/2)
                             2     
map(op, indets(s1, sqrt));
                             /   1\ 
                            { 2, - }
                             \   2/ 
s2 := log[2](3);
                             ln(3)
                             -----
                             ln(2)
map(op, indets(s2, ln));

And expression above is error
Error, type `ln` does not exist

Can you help me?

s3:=surd(2,3);

map(op, indets(s3, surd)); --> { } 

Download help_map_indets.mw

I want to solve the equation (-2*cos(x)^2+2*sin(x+(1/4)*Pi)^2-1)/sqrt(-x^2+4*x) = 0 in RealDomain. I tried
 

restart; 
RealDomain:-solve({(-2*cos(x)^2+2*sin(x+(1/4)*Pi)^2-1)/sqrt(-x^2+4*x) = 0}, {x});

I got four solutions

If I work around

restart;
 RealDomain:-solve({-x^2+4*x > 0, (-2*cos(x)^2+2*sin(x+(1/4)*Pi)^2-1)/sqrt(-x^2+4*x) = 0}, x);

I only got two solutions

With Mathematica, I got three solutions 

That is mean, Maple lost the solution x = 5*Pi/4. I check this thing

f:= x-> (-2*cos(x)^2+2*sin(x+(1/4)*Pi)^2-1)/sqrt(4*x-x^2) ;
f(5*Pi/4);

and got the result 0. 

Are these bugs?

Dear all

I would like to find the optimal parameters of the attached optimal control problem 

The system of ODEs is defined and boundary conditions and The hamilton Jacobi Bellman equations is written.

Optimal_control.mw

Many thinks

I'm currently working my thesis and can someone help me to write a code to solve this IVP

u_t + 2×u²×u_x−(u_x)²−½×u_{xx}×u=0

with initial condition

u(x,0)=-tanh(x)

Dear friends,

Greetings.

How to get the second solution.

how to change the guess value in maple.

figure 1 plot in Matlab with two different initial guesses.

TWOSOLUTION.mw

I am writing a maths books using maple now. It is fantastic to use maple for writing books in maths.
 

Download cannotCopyWhy.mw

I enclose a part of my document where in I made a particular line with text and maths formats combined.Then I made changes in the line. Now copy paste does work only for the later half (both text and maths formats). The corrected first part is not being copied.

How do I do the corrections properly so that copy paste is not a problem at laer stages.

Thanks for the answer.

Ramakrishnan V

The equation sin(9*x-(1/3)*Pi) = sin(7*x-(1/3)*Pi) can be solved easy by hand with solutions k*Pi and -Pi/48 + K*Pi/8. With Maple, I tried 
solve({sin(9*x-(1/3)*Pi) = sin(7*x-(1/3)*Pi)}, x, explicit, allsolutions)

I don't get the above solutions. How can I get these solutions?

I use patmatch to look for certain expression inside a larger expression.

I find sometimes I need to repeat the same code to check for  "... + ..."   and also ".... * .....", since I do not know to tell Maple to look for + or * in the same code. *Luckily, I do not have to check for "-" or "/" operators, since "+" match with "-" and "*" match with "/").

An example will make things more clear.

Suppose I want to see if sin(x)*sqrt(x*y) has sqrt(x*y) anywhere in it. So I first try

restart;
expr:= sin(x)*sqrt(x*y);
if patmatch(expr,a::anything+(b::anything*x*y)^(c::anything),'la') then
    assign(la);
    if c =1/2 or c=-1/2 then
       print("found sqrt(x*y)");
    else
       print("did not find sqrt(x*y)");
    fi;
 else
   print("did not find sqrt(x*y)");
 fi;

And this fails, since I used "+" inside the patmatch. Then I try '*" instead

if patmatch(expr,a::anything*(b::anything*x*y)^(c::anything),'la') then

And now it does match.

What I'd like to write, is something like this (which ofcourse does not work)

if patmatch(expr,a::anything (* or +) (b::anything*x*y)^(c::anything),'la') then

I looked at conditional in patmatch, but it does not seem to apply for the above.

Any suggestions?

Maple 2019.1 on windows 10

Dear Users!

Hope everyone should fine here. I want to know how to multiple the entries of a matrix with a matrix like If A is matrix as:

A:= Matrix(2, 2, {(1, 1) = 0, (1, 2) = 0, (2, 1) = 0, (2, 2) = 2})
I want nonzero entries should multiply with m*m identity matrix and zero entries multiply with null matrix of order m*m. for m=2 the desired results i calculated manually as:

Matrix(4, 4, {(1, 1) = 0, (1, 2) = 0, (1, 3) = 0, (1, 4) = 0, (2, 1) = 0, (2, 2) = 0, (2, 3) = 0, (2, 4) = 0, (3, 1) = 0, (3, 2) = 0, (3, 3) = 2, (3, 4) = 0, (4, 1) = 0, (4, 2) = 0, (4, 3) = 0, (4, 4) = 2});

I want to know the general way. Thanks in advance

most people who post here seem to use .mw written in 2D, which I do not like to use.

Is there a tool to convert such a file to 1D worksheet that one can use from the command line before opening the document itself in Maple?

The reason I ask, sometimes opening the original file and trying to do this from inside Maple by selecting the code using the mouse, then  Format->ConvertTo->1D   does not work, and gives an error.

Also, sometimes, when I try to first create an empty worksheet document, and then try to copy/paste the code from the other document over, it also does not work. This happens when there are syntax errors in the original document. The error that comes up is

        Parse:-ConvertTo1D, "first argument to _Inert_ASSIGN must be assignable"

As an example, please see the attached file in the following question

https://www.mapleprimes.com/questions/227506--I-Need-Help-Trying-To-Write-A-Code

It will good to have a tool that converts such documents to 1D worksheet or even plain Maple code (.mpl) but I did not see such option under SAVE AS either. Also, when I tried to export it as .mpl file, I get the same error as above in the file. So I gave up.

Hello Anybody can help me to write codes for PDE to solve by Galerkin finite element method or any other methods can be able to gain results? parameter omega is unknown and should be determined.

I attached a pdf file for more .

Thanks so much

fem2
 

Download fem2

buchanan2005.pdf

Download Dtm.mw