I have big expressions containing RootOf() which are however pretty simple.

For example something like

RootOf(x^2+1,x)

Is it possible to convert this later into the actual solution? e.g. +-*I ??

In Maple this works

my_list :=[1,2,3];
my_list[1]:=0;

But this does not

my_set:={1,2,3};
my_set[1]:=0;

gives error "Error, cannot reassign the entries in a set". I suppose it has to do with the fact that sets, mathematically speaking, do not have an "oder" per say? But the elements must be ordered internally as they show, right? So the first element in the set is "1" and the second element in the set is "2", etc...

Had to use the ugly and unatural notation of

my_set := subsop(1=0, my_set)

To change the element of a set. The above implifies an order as well. So why the first did not work, but the above works?

The question is why is this inconsistency of notation?   It is much more natural to write "A[i]:=something". 

If using "subsop(1=0, my_set)" is a must for some reason, then why Can't Maple make a short cut, where if a user types "A[i]:=something" where A is a "set", then it will internally get modified/replaced by "A:=subsop(i=something, A)", so that one can still use the more natural syntax instead?

But it would be better just removing this restriction of using A[i]:=something on a set.

i have a panel case here. Now I have got three 10 by10 data matrix which are x location, y location and z displacements respectively. How can i draw them into a surface plot? and 

how can i draw a displacement contour plot?

Hi all, is there a reliable way to hide/obfuscate the source code of a maple library file (*.mla) (e.g. if you want to redistribute it)?

From what I know, since it has to be into the archive, any not exported (or hidden) procedure can be easily viewed setting kernelopts(opaquemodules=false) or through LibraryTools:-Browse.

Hi all, how to write function to get cylic sum and symmetric sum

Example.

Thank you very much.

If I try to plot the function piecewise(x < -2, 2, -2 <= x and x <= 5, 2*x+5, 5 < x, 1-sqrt(x-5)) which is discontinuous, why does the plot is continuous?

Any suggestions.

Thanks

Can someone help with the simplification of the result of this code? I am sure the "qs" in the final result should not appear.

Thanking you in anticipation of your positive responses

#k=1
restart:
P:=sum(a[k]*x^k, k=0..2):
assume(alpha>0,alpha <= 1):
Q:=fracdiff(P,x,alpha);
e1:=simplify(eval(P, x=q))=y[n]:
e2:=simplify(eval(Q,x=q))=f[n]:
e3:=simplify(eval(Q,x=q+h^alpha))=f[n+1]:
var:=seq(a[i], i=0..2):
M:=e||(1..3):

Cc:=eval(<var>, solve(eval({M}),{var}) ):
for i from 1 to 3 do
	a[i-1]:=Cc[i]:
end do:
Cf:=P:
E:=collect(Cf, [y[n], f[n], f[n+1]], recursive):
print():
#y[n+1]=collect(simplify(simplify(expand(eval(Cf,x=q+h^alpha)),size)), [y[n],f[n],f[n+1]], factor);
y[n+1]=simplify(eval(Cf, x=q+h^alpha)):
collect(%, [y[n], f[n], f[n+1]], recursive);

I want to solve the following algebraic equation system using solve command. But, it gives only the trivial solution. I want to find a,b and c in terms of k. k is a constant here. Thanks in advance.

Input:

solve({-6*c+(3/2)*c^2-2*b-3*b*c+(3/2)*b^2-3*a*c+(k^2)*b-b+(3/2)*(a^2)+(k^2)*a-a=0,
-2*b-3*b*c+3*(b^2)-6*a*c+2*(k^2)*c-2*c-9*a*b+3*(k^2)*b-3*b+6*(a^2)+4*(k^2)*a-4*a=0,
(3/2)*(b^2)-3*a*c+(k^2)*c-c-9*a*b+3*(k^2)*b-3*b+9*(a^2)+6*(k^2)*a-a=0, 
-3*a*b+(k^2)*b-b+6*(a^2)+4*(k^2)*a-4*a=0, 
(3/2)*(a^2)+(k^2)*a-a=0},{a,b,c});

Output:

{a=0, b=0, c=0}

I want to solve an ODE of second order with Adams-Bashforth method.

It seems the solution has convergence for a small range of requested interval.

Please download the file from link below and made your comment on it.

Thank you for taking your time

https://ufile.io/f9a0e

When I input the the following command line in Maple 2018.1

 > Int(1/(1+sqrt(x)),x=0..1)=int(1/(1+sqrt(x)),x=0..1);

the output is 

>Int(1/(1+sqrt(x)), x = 0 .. 1) = MeijerG([[0, 0, 1/2], []], [[1/2, 0], [-1]], 1)/Pi

which is not the desired result!  How can I get the desired result like this

>2-ln(2)

Thanks a lot.

Goodday everyone,

Please, anyone with useful informations on the above stated error code should help.

Below is the attached file.

Error_invalid_subscript_selector.mw

Thanks in anticipation for your response

Please how do I add a number to column values in a matrix.

I needed to covert a column data representing temperatue values from celcius  to kelvin and I needed to add 273 to this column.

Thank you in advance.

What is a good way to generate a random, high degree polynomial with integer coefficients, that has a high number of real roots. Example a degree 800 with 600 real roots. I am not looking for a mul application.

I entered this function
f:=x->(4*x^2-4)^(4/5);

Then I entered f(0) and got (-4)^(4/5).

When I tried to approximate , I got -2.452480922+1.781831689*I

I am looking for the real number value, which is 3.031433 with my TI-83 calculator and here https://www.desmos.com/calculator/b1soxuhbri

How do I set it in maple so that x is assumed to be real in f(x) and all outputs are real.

Hello everyone. Below is the loop coding to plot the rectangles. 

This will give me  21 rectangles with 21 graphs. And how am I going to combine them(21 rectangles) in one single graph? Really appreciate your help. Thank you in advanced! :)