Maple 13 Questions and Posts

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

Hi again all

You can enjoy this simple Maple code to find the proper divisors of a given positive integer (whole number).



here  some_proper_divisor_examples_3.pdf   file

Hope this helps

Matt Anderson


I came across this example from Maple's Online Help:

F := proc(t)
plottools[line]([-2,0], [cos(t)-2, sin(t)], color=blue),
plottools[line]([cos(t)-2, sin(t)], [t, sin(t)], color=blue),
plot(sin(x), x=0..t, view=[-3..7, -5..5]);
end proc:


Why is it not working?

Thank you!


Hi all,

Wrote some Maple code, and want to share.

I put less than eight hours into this exploration.

I have been running a computer to find Fermat factors for over ten years now.  Want support.

This is an exploration in some mostly composite whole numbers.

see 2_to_the_exponent_p_3.pdf

also see 

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/ .


Have a look.






Hi all,

Do some of you know the form of all primes greater than five?

Is it 6*p +/- 1?


Maple Worksheet - Error

et/convert/                         .

Download Maple_prime_expository_number_one_for_sharing.mwmaple_about_primes.pdf





The command


will output

Can we have the number 30 in a non-italic format?
Thank you!


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!



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