Qualifying exams are rapidly turning my brain to mush, so I offer this problem for y'all to figure out: I've grabbed some encoded text from a pre-existing worksheet. I've decoded the text, so now I am left with the typeset version of what the text represents. The command Typesetting:-Parse() should work on this text, and yet it does not. For a concrete example: getstr := "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";

Hello all, I'm new here and I don't know if it is the right place to report a bug. I do not own Maple by myself, I'm just using our campus-net installation of Maple 9. I have no access to more recent versions right now. I was typing a functioning old Maple 4 sheet, but got a different result with Maple 9 (see below)! However, I found to introduce a simplify() before the int()-call fixes the problem (see last command). Do higher versions of Maple have the same problem with this code? Thanks, Klaus > restart: with(linalg): Warning, the protected names norm and trace have been redefined and

I have the following:

>                 /             /         2          \\    
>              1  | 2    2      |/ 2    2\       2  2||    
>       eqn := - +\b  + a , sqrt\\b  + a /  - 4 a  c // - c
>              2                                           
                                                     (1/2)    
        1  2   1  2   1 / 4      2  2    4      2  2\         
 eqn := - b  + - a  + - \b  + 2 b  a  + a  - 4 a  c /      - c
        2      2      2                                       
>                          solve(eqn, c)
                               2    2

The first example below seems OK. But, should I be expecting the different behaviour in the second example?


> restart:
> p := module() option package; export foo;
> foo:=proc(x) x; end proc;
> end module:

> foo := proc(x) cos(x); end proc:

> foo(3.2);
-0.9982947758

> p:-foo(3.2);
3.2

> evalhf(p:-foo(3.2)); # OK
3.20000000000000018

> restart:
> p := module() option package; export sin;

Dear all, I recently had to solve the following integral: A:=(x,m)->(-m^2-2*x*m+1)/(sqrt(x)*sqrt((m+x)^2-1)*(x+sqrt((m+x)^2-1))); IntegralA:=(m)->Int(A(x,m),x=0..infinity); When I used evalf(IntegralA(1)); I get -2.828427125 But when I use int(A(x,1),x=0..infinity); to get a symbolic answer I get a complicated expression involving the function MeijerG function. Mathematica, on the other hand gives -2sqrt(2) exactly for the symbolic value. Does anybody know why? I'm curious even though the decimal values are the same. I was using Maple 11 and Mathemtica (I think) 5. Regards, Drew

Hi folks, When I use a command like: implicitplot3d(f(x,y,z)=0,x=...,y=...,z=...) obviously maple has to compute all the points in the given range which satisfy the equation. Does anybody know which numerical method it uses to do this? Regards, Drew

It's just a silly, simple thing, but I'm going to call attention to it anyway: fopen("file", w); Produces the error message "Error, (in fopen) file mode must be READ or WRITE." This is incorrect. The file mode must be READ, WRITE, or APPEND. Like I said: silly, but worth noting.

Hi!. I'm Scasbyte. I have been using Maple 11.0 for not too much time, I have found that after 2 or 3 hour of usage, it becomes amazingly slow, when I look an usage of the RAM memory it uses about 800 Mb and starts using Virtual Memory. Even if I restart maple(using the command "restart;" it still slow, I have to close Maple and open it again to solve this! Do you have the same problem?? What can I do to solve this?? Thanks!.

This works in Maple 10, but fails (see below) in Maple 11...

> pp := -exp(x)+kk[1]*log(x)+kk[2]*x+kk[3]*log(log(x))+kk[4]*exp(x);

> vv := {kk[1], kk[2], kk[3], kk[4]};

is(f@(g@h) = (f@g)@h); true is(f@(g@g)=(f@g)@g); false In the first, both sides come out as `@`(f,g,h) In the second, we get `@`(f,`@@`(g,2)) and `@`(f,g,g) which no longer match for "is"

Is it intended that addition and multiplication act differently here?

> A := proc(s)
if type(s,`numeric`) then return true; fi;
return false;
end:

> A(2);

> A(a);

"I've seen this element before..." Often we are faced with the problem of building up sets incrementally, by removing pieces one at a time from a larger whole. The bottlenecks in this case are usually: 1) adding a small set X to a large set S (copies S and X, making this ~O(|S|+|X|)) 2) removing elements of the large set S from the small set X (binary search: |X|*log(|S|)) A classic example of this is a breadth-first-search. We start at one vertex of a graph and in each iteration we add the set of new neighbors X to the set of vertices S that have already been found. We can make this more useful by making the program return the sets of new neighbors found in each iteration, that is, the sets of vertices that are distance 1, 2, 3, etc. from the initial vertex.

Which of these do you prefer, and why?

foo := proc(T)

...

if type(s,`+`) then
r := map(foo,s);
fi;

...

end;

foo := proc(T)

...

if type(s,`+`) then
r := 0;
for x in op(s) do r := r+foo(x); od;
fi;

...

end;

I am running Maple under Windows XP Pro, SP2. A couple week ago, I upgraded from Maple 11.0 to Maple 11.01. Everything went fine. According to Help>About, I had the version from June 8 2007, Build ID 296069. Just now, when I started Maple, there was a pop-up notice telling me that there was a newer version of Maple available. So I downloaded and installed the new version. According to Help>About, I now have the version from July 10 2007, Build ID 303882. There seems, though, to be an inconsistency: kernelopts(version) says     Maple 11.01, IBM INTEL NT, Jun 8 2007 Build ID 296069

Dear all, a:=.5; s:=.2; sol:=solve(1+(5*x)*(log(5*x)-1)=.5*v-sqrt(k)*x, x); eval(sol, [k=.98, v=.4]); gives me 0.2019811135 but there should be 2 solutions; if I put the values of k and v before solve: > a:=.5; s:=.2; k:=.98; v:=.4; a := 0.5 s := 0.2 k := 0.98 v := 0.4 > sol:=solve(1+(5*x)*(log(5*x)-1)=.5*v-sqrt(k)*x, x); sol := 0.2019811135, 0.1288902502 i need the 2nd solution and the purpose of this code is so that i can change the value of k and v so I need to make the 1st 3 lines work.