Dear all,

I need your help to compute the multiplicative  group generated by the following two matrices.

A :=  Matrix(2, 2, [[2, 0], [0, 1]]) ;

B := Matrix(2, 2, [[1, 1], [0, 1]]) ;

 such that A.B different to B.A

many thanks

Hello Dr/Pof/Colleague

Please help me on the ODE BVP problem

my target i want RUN double loop

Download 3DAKc2alpha.mw

Hi all,

I need any help for the following question:

restart;
H :=n ->sum(1/k, k = 1 .. n) ;

If you computational devices has only 16 decimal points of accuracy, does computing H(n) for n greater than 10^16 give  any information about the series;

Many thanks

Hi,

     I am new to Maple and my task is to find an analytical solution of Lateral Vibrations of Beams. Even though I referred this forum to get an idea about solving a fourth order ODE bvp,I still couldn't find the solution. Although a non trivial solution exists for this case, Maple is still returning a trivial output(i.e the determinant is not returning zero). I need to find the value of constants C1 to C4 but I am unable to understand what the error is. I have attached the file containing my current solution below.

SOP2.mw

Any help will be appreciated,

Kind Regards,

Ajay

 

how can i determain the drawing dimensions ( length and width), if i want to draw two graphs of the same dimensions?

let
expression := {{a*x}, {{(b*y)}/3}, {a*b}, {log(x+y)}, {3*x}};

I would like to convert the above expression as
 

requiredForm :={a*x, (b*y)/3, a*b, log(x+y), 3*x};

I observed that the function convert can do some convertion but have to use second argument + or *. which causes unstable results.

One method I found is to convert the expression to string and remove "{}" using StringTools:-Remove function.
I would like to know if its possible to do with out converting to String.

result:= convert(expression, `+`);

                                    /1      \              
   result:= {a b} + {a x} + {3 x} + { - {b y} } + {ln(x + y)}
                                    \3      /              

is there anyway I can get the requiredForm

I wanted to investigate this sum. can someone please help me identify why my code is producing the erroraneous output of 1/2 for every number, despite everything aside from the final computation being as expected.

Maple Worksheet - Error

Failed to load the worksheet /maplenet/convert/MAPLEHELP.mw .
 

Download MAPLEHELP.mw

With(group)

a:=[[seq(I,i=0..5)],[seq(I,i=6..8)]]

mulperms(a,a)

array out of range 

according to book, is this calculation?

how to calculate like the book do?

i use function 

https://www.maplesoft.com/applications/view.aspx?sid=154192&view=html

but not work

A list must have only 7 one and 50 zeros

length of list is fixed and equal 57

how to list all combination above?

Dear all,

Can anyone help me to adjust the plot data containing (10^-xxxxxxxx)

EX: [3 10^-3967, 5 10^-1924, 4 10^-7315...................]

Thanks in advance.

I am developping an algorythm in which I need to obtain a 3D plot and its respective colorbars. As far as I know, Maple does not have a function with includes such a colorbar automatically (like Matlab, for example). So, I have had to get 3D plot and colorbar separatelly, as independent plots. It has worked fine, but now I need to export such graphics as EPS files, which imply merging them as a single graphic.

Here is a small example, where I try to put such graphics inside a table for then exporting it as EPS:

restart:

with(plots):
with(DocumentTools):

graph:= plot3d(x^2+y^2, x = -10..10, y = -10..10, colorscheme = ["zgradient", ["Red","Blue"]]):

grad_min, grad_max:= (min, max)(op([1,3], indets(graph, specfunc(anything, GRID)))):

colorbar:= densityplot(axis_z, axis_x = 0..0.1, axis_z = grad_max..grad_min, style = patchnogrid, size = [100,250], axes = boxed, tickmarks = [0,10], labels = ["",""], colorscheme = ["zgradient", ["Red","Blue"]]):

tab:= Tabulate([graph, colorbar], exterior = none, interior = none, weights = [4,1]):

 It has not worked, though. Can anyone suggest a solution for that? I need to export both graphics as one single file, preferably EPS, because of its high resolution.

Hello! I am using Trace procedure from LinearAlgebra package and I also want to use Trace placeholder in conjunction with evala (two different procedures with the same name). If I load the LinearAlgebra package, then the Trace placeholder will not work.

The only solution I found is to avoid loading the LinearAlgebra package and call each function like LinearAlgebra[Trace](Q). But this is very tedious (I use many functions in that package), and also if some other user uses my code, he might have already loaded the LinearAlgebra package.

Is there any way to rename a command inside the package when loading it, or any other workaround?

Thank you!
Santiago

Suppose a sum of sines, each depending on a distinct variable x[i]:

>  S := sum(sin(x[i]),i=1..N);

Differentiating wrt to x[i]

> diff(S,x[i]);

should yield cos([x[i]) if i belongs to the interval 1..N, and zero otherwise, but Maple gives

> diff(S,x[i]);
                          N            
                        -----          
                         \             
                          )            
                         /    cos(x[i])
                        -----          
                        i = 1          

which is wrong of course.
 

In a sum I would expect 0 when the minimum index is larger than the maximum index.

Yet Maple 2017.3 does this only for special cases:

> for i from 0 to 4 do
     sum(1,j=i..1);
  end do;
                               2
                               1
                               0
                               -1
                               -2

Dear all,

I am new to Maple and trying to figure out the use of dataframes. The help files say you can use dataframes in plotting but I keep getting errors. I have the following code which uploads a short dataframe with column headers which include x and y. I use

with(plots);
with(Statistics);
mydat := Import("this:///Datafiles/greg.csv"); 

with(mydat);
dataplot(x,y);

I receive the following error message 
Error, (in Plot:-DataPlot) invalid input: lhs received _m4754289856, which is not valid for its 1st argument, expr

Can anyone spot what I'm doing wrong?

Thanks in advance

Jo