MaplePrimes Questions


I've got this list:

L:=[[TC,DB], [], [TD,JK], [IW,CM], [], [KJ,DJ]]

What command to remove the 'null sets', leaving :=[[TC,DB],[TD,JK], [IW,CM], [KJ,DJ]]

this doesn't work:

remove(has, L, 0)

a::real and b::real;
Error, type `real` does not exist

`and`(a::real, b::real);
                       a::real and b::real

Since a::real by itself is fine, why does the conjunction give an error?

These two are evaluated differently as well:

Im(a) > 0 and a <> 0;
                           0 < Im(a)
`and`(Im(a) > 0, a <> 0);
                      0 < Im(a) and a <> 0

The consequence is that these two will work differently:

is(a <> 0) assuming Im(a) > 0 and a <> 0;

is(a <> 0) assuming `and`(Im(a) > 0, a <> 0);

is(a <> 0) assuming Im(a) > 0; # sadly, just Im(a) > 0 is not enough

It looks like (a and b) and `and`(a, b) just do completely different things:

x := proc() local r; r := rand(); print(r); r end proc;

a > x() and a > x() and a = a;
                        395718860534 < a

`and`(a > x(), a > x(), a = a);
         193139816415 < a and 22424170465 < a and a = a

That is, (a and b) first simplifed the expression and then evaluated a>x() once, but `and`(a, b) evaluated the arguments without doing any simplifications.

Also, should this work (it works with `real`, which supposedly doesn't exist):

Re(a+b) assuming a::realcons, b::realcons;
                           Re(a + b)


I've compiled a program with Maple 18. unfortunately it gives me the message "Large sortie de plus de 1000000 noeuds". If any one have any idea to resolve this problem. Thanks you very mutch for your support. 

With Startup Code Editor opened, save and close the parent worksheet. Any unsaved changes in the Code Editor are lost.


I tried to solve 4 simultaneous equations but the result is an empty matrix.

Is that because there is no solution or did I make something wrong?

You can download the file by using the link below.

I have noticed that I don't receive e-mails anymore when contributions are submitted to my subscriptions.
I used to.
Has this happened to anyone else?

It is embarrasing to have asked somebody a question and gotten a reply you are not made aware of.

What to do about it?


I have a matrix (for example a 6*6 matrix) and I want to add a row and a column between row and column of number 3 and 4. it means that finally, we have a 7*7 matrix.



The documentation says that Subgroup(c) returns the subgroup of the coset c.

Also, the display of Elements(lc) is garbled in Maple as well, not just in the image.


sgr := Subgroup(Elements(SymmetricGroup(4)), SymmetricGroup(5))



lc := LeftCoset(Perm([[1, 2]]), sgr)




Error, invalid input: GroupTheory:-Subgroup expects its 1st argument, generators, to be of type {list, set, identical(undefined)}, but received _m917308956640



{_m917312836128, _m917312839712, _m917312840544, _m917312841376, _m917312842272, _m917312843296, _m917312844224, _m917312845152, _m917312846240, _m917312847072, _m917312848768, _m917312849696, _m917312850624, _m917312851552, _m917312852288, _m917312853248, _m917312854144, _m917312855072, _m917312856000, _m917312857472, _m917312858592, _m917312859552, _m917315257248, _m917315263744}



I want to highlight the intersection between 2 graphs; pp(m,a) and the plane m=-0.2

PP := .8707945038*exp(-50.00000000*(m-0.842e-1)^2+(2.745342070*(m-0.842e-1))*(a-2.3722)-.1046792095*(a-2.3722)^2)

How can I do that?

Thank you

Hello every body

I have a plot that contains two curve. I need to chracterize the curves with `min(D_{T})` and `max(D_{E})`. Is it possible to write legend of plot such that when include it in latex file,  T and E be presented in indices?

i used this  commend to plot three equation and it actually work .my question her how to show any point cordinates just i pointed on it ? could i do it by maple or what ?
help please 
implicitplot3d({f[1], f[2], f[3]}, Q[h] = 0 .. 100, S[h] = 0 .. 100, R[h] = 0 .. 100);

when i evaluate this summation if Q[h],S[h],R[h] are big floating numbers it take along time how i decrease this time 
P := simplify(sum(sum((t+1)*Q[h]^2*(1-Q[h])^(t+T)/(t+1+(R[h]/S[h])^sigma*(T+1)), t = 0 .. infinity), T = 0 .. infinity))

The link below has my code for generating 2 matrices.  The 1st one does not generate flfoating point numerical data; whereas, the 2nd one does.  What is wrong with the 1st case?  I am attempting to single out one harmonic which works in the 2nd case.  Also, is there a way I can generate a spectrum of S2(k= 1 to 100, t= 0 to 1)?



evalf(int(GAMMA(s), s = 1-I*infinity .. 1+I*infinity)); # careful

There seems to be no way to terminate this computation. After clicking "Interrupt the current evaluation", the worksheet is still unresponsive, I cannot edit or copy the contents.

I can close the document, but even after I quit Maple, mserver.exe is still running and I have to terminate it manually.

This is in Maple 2017.2, system="X86 64 WINDOWS", wordsize=64.


int(1/(s^2+1), s = 1-I*infinity .. 1+I*infinity); # as expected

evalf(Int(1/(s^2+1), s = 1-I*infinity .. 1+I*infinity)); # Pi?

So evalf(Int(...)) either doesn't know how to handle complex infinite endpoints or handles them in a way incompatible with how int() does it.


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