Maple 13 Questions and Posts

These are Posts and Questions associated with the product, Maple 13

Hi everyone!

Is it possible to evaluate int(diff(u(x,y,t),x)*v(x,y,t)+diff(v(x,y,t),x)*u(x,y,t),x) directly as u(x,y,t)*v(x,y,t) in Maple?


Good afternoon! I can not give such terms in the procedure, simplify and evalf do not help. Why does it write three lambdas instead of a lambda in a cube?
What can I do about it?




I am using Maple 13, 16 and 17 on 64 bit ubuntu 14.04LTS without 

any problems.


I tried to start the above Maple versions after upgrading to ubuntu 18.04LTS. Unfortunately, Maple does not start and transmits an incorrect hostid error message. The error message for Maple 16 is pasted below.


The command ifconfig -a produces an ethernet address 00:21:70:a6:a4:4b that is identical to the hostid given in the license.dat file.


I believe that the license manager flexnet is 32 bit. I used the synaptic 

manager to install lsb-base and ia32-libs (synaptic package manager refused to install lsb-core and transmitted some error messages). However, this did not help and I obtained the same hostid error message.


I do not know what is causing the hostid error message. Maybe some script file/s in the Maple installation can be modified such that Maple starts correctly?


Any assistance in getting Maple 13, 16, 17 to start on ubuntu 18.04LTS 

would be much appreciated.


Thank you very much for your support.


> ...:~/maple> maple16
> Maple initialization error, Invalid host.
> The hostid of this system does not match the hostid
> specified in the license file.
> Feature: Maple16
> Hostid: 002170a6a44b
> License path:
> /home/apps/maple16/toolbox/MapleSim/license/MapleSim.dat:/home/apps/maple16/license/license.dat:
> FLEXnet Licensing error:-9,57
> For further information, refer to the FLEXnet Licensing documentation,
> available at
> ",1,5ci9cywR8uvrXaVJ4IkoXH0TFBBbJwSK_TulrfrUDs5AyVQ4TXsHOVm5KWKAIhp4OZb9C4OAnmgylY1JC6fpbdZK9SjQLVrW012Uzxq18iDYC56NG2eDyHS8RPA,&typo=1".

> root@<mailto:root@>...:~# ifconfig -a
> enp0s25: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
> ether 00:21:70:a6:a4:4b txqueuelen 1000 (Ethernet)
> RX packets 0 bytes 0 (0.0 B)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 0 bytes 0 (0.0 B)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
> device interrupt 22 memory 0xf6ae0000-f6b00000
> lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
> inet netmask
> inet6 ::1 prefixlen 128 scopeid 0x10<host>
> loop txqueuelen 1000 (Local Loopback)
> RX packets 454 bytes 35138 (35.1 KB)
> RX errors 0 dropped 0 overruns 0 frame 0
> TX packets 454 bytes 35138 (35.1 KB)
> TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0



Good afternoon. How do I disable the numbering of _Z constants? Because
of this, you can't use the procedure in a loop
Is it possible to disable numbering or do something else?

restart; with(linalg); t := 3



S := proc (a, b, z) local L, y, s1, s2, sist, chl, lambda1; L := diff(y(x), x, x) = lambda*y(x); assume(lambda < 0); dsolve(L, y(x)); y := unapply(rhs(%), x); s1 := y(a) = 0; s2 := y(b) = 0; sist := {s1, s2}; genmatrix(sist, {_C1, _C2}); det(%); chl := combine(%); _EnvAllSolutions := true; solve(chl); sort(%); lambda1 := subs(_Z1 = k, %); print(lambda1); lambda1 := unapply(%, k); lambda1(z) end proc:

S(0, Pi, 3);

Warning, solve may be ignoring assumptions on the input variables.






for i to t do S(0, Pi, i) end do:

Warning, solve may be ignoring assumptions on the input variables.




Warning, solve may be ignoring assumptions on the input variables.




Warning, solve may be ignoring assumptions on the input variables.






This does not work with Maple 13. Can I still do something like this just using the linear operator D?




I need the derivative D(f)!!

Thank you!!!


How do you print [0,infinity) in Maple 13 like

RealRange does not seem to work.

Thank you!


Hi all,

Look at my pretty plot.  It is defined by


where n and m are one digit positive integers.

You can modify my worksheet with different values of n and m.


The name of the curve may be something like Curve of Lesotho.  I saw this first in one of my father's books.



How do we replace D^i by diff(y(x),x$i) in did:=D^14+23*D^13+144*D^12
in Maple 13?

Thank you!



I have the expression:

This works (Ans. 144):


This works (Ans. 144):


Why doesn't this work?


Why doesn't this work?


I need those "generic" substituions for certain loops that I am making.

Thank you!




I would like to have Maple give me sin(2nPi) = 0 assuming that n is a positive integer. Is there a way to do it?

Thank you.


Hello Maple community and others,

It has been proven that every positive
rational number can be represented in 
Egyptian Fraction form

See wikipedia on Egyptian Fractions

We have the fact that the harmonic series diverges
Let Hn = 1 + 1/2 + 1/3 + ... + 1/n.

Then the limit as n goes to infinity of Hn is unbounded.

It seems these two facts go hand in hand.

Is there a procedure in Maple that will give
Egyptian Fraction representation of an arbitrary
rational number?

I made a worksheet with some examples.




Hello again,   I'm trying to write a procedure to multiply quaternions.   We know that they can be represented as a vector of length 4.   See Wikipedia.   My try  -

qaa=[8,4,6,2] and qab =[2,,4,6,8]

end proc;

maybe needs some looping or data from a table.  



Hi all,

We want to find a curve fit for an integer sequence.

We have n such that n^2+n+17 is a prime number.

See and comments.

Use the Maple CurveFitting package.

I tried with(CurveFitting).

We do not know if this is best represented by a polynomial or exponential curve fit.




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