Maple Questions and Posts

These are Posts and Questions associated with the product, Maple

I find the 2D math input in Maple to somewhat cumbersome for various expressions.
Specifically, I have a function f(z) = z^2, with w = f(I x + y) where I is the imaginary number.

I typed the line in 2D math

plots[implicitplot]({Im(w) = 2, Re(w) = 2}, x = -5 .. 5, y = -5 .. 5, colour = {"Blue", "Red"})
Error, (in plot/color) invalid color specification: {"Blue", "Red"}

For some reason this does not work in 2D math, but in Maple-input it works as expected.

I recall from past use of Maple, that there were other problems as well with the 2D math input.
I know you need to be particular with the use of space. 

Are there other common pitfalls or "bugs" related to use of 2D math input ?

Dear colleagues,

I need to determine a linear boundary of a data cloud. More specifically:

I have a set of experimental points y(x). On the plane x-y, the data points form a cloud of a triangular shape, with the legs coinciding with the x and y axes.  I need to best-fit the outer (upper-right), boundary of the data cloud, i.e. the hypotenuse of the "triangle",    with a linear function. It is not necessary for the line to go through the boundary points exactly, I need a best-fitting approximation (actually, the gradient of the line). Could someone give me any idea how to do it? (Or, at least, advice how I can google it, as my searches like "approximate boundary data cloud" return loads of irrelevant stuff.

Thanks in advance!

Hi,

 

So I'm new to MAPLE and working on plotting graphs for a car suspension system. I've had to differentiate some equations and use other formulas to calculate the peak of 7 different curves. I then need to plot these onto another graph. I've managed to calculate the values but I'm now trying to plot them on the graph using the pointplot command and I'm getting an error. The full code is shown below, any help is appreciated, thanks;

> Y(s):=100/s:
> X2(s):=(Y(s)*(1400*s+135000)*(c2*s+k2))/((49.8*s^2+(1400+c2)*s+135000+k2)*(466.5*s^2+c2*s+k2)-(c2*s+k2)^2):
> with(inttrans):
> x2(t):=unapply( expand( evalf( invlaplace(X2(s),s,t) )),t,c2,k2):

> c2_1:=simplify( x2(t)(t,1000,3000) ):
> D1:=diff( c2_1,t ):
> t_star1:=fsolve( D1,t=0.2..2 ):
> xp1:=x2(t)(t_star1,1000,3000):
> o1:=((xp1-100)/100)*100:

> c2_2:=simplify( x2(t)(t,1250,3000) ):
> D2:=diff( c2_2,t ):
> t_star2:=fsolve( D2,t=0.2..2 ):
> xp2:=x2(t)(t_star2,1250,3000):
> o2:=((xp2-100)/100)*100:

> c2_3:=simplify( x2(t)(t,1500,3000) ):
> D3:=diff( c2_3,t ):
> t_star3:=fsolve( D3,t=0.2..2 ):
> xp3:=x2(t)(t_star3,1500,3000):
> o3:=((xp3-100)/100)*100:

> c2_4:=simplify( x2(t)(t,1750,3000) ):
> D4:=diff( c2_4,t ):
> t_star4:=fsolve( D4,t=0.2..2 ):
> xp4:=x2(t)(t_star4,1750,3000):
> o4:=((xp4-100)/100)*100:

> c2_5:=simplify( x2(t)(t,2000,3000) ):
> D5:=diff( c2_5,t ):
> t_star5:=fsolve( D5,t=0.2..2 ):
> xp5:=x2(t)(t_star5,2000,3000):
> o5:=((xp5-100)/100)*100:

> c2_6:=simplify( x2(t)(t,3000,3000) ):
> D6:=diff( c2_6,t ):
> t_star6:=fsolve( D6,t=0.2..2 ):
> xp6:=x2(t)(t_star6,3000,3000):
> o6:=((xp6-100)/100)*100:

> c2_7:=simplify( x2(t)(t,4000,3000) ):
> D7:=diff( c2_7,t ):
> t_star7:=fsolve( D7,t=0.2..2 ):
> xp7:=x2(t)(t_star7,4000,3000):
> o7:=((xp7-100)/100)*100:

> with(plots):
> pointplot( {[1000,o1],[1250,o2],[1500,o3],[1750,o4],[2000,o5],[3000,o6],[4000,o7]} );
Error, (in pointplot) incorrect first argument
 

P.S. o1 through to o7 represent the peak of the curves and are to be plotted on the y-axis against 1000,1250,1500,1750,2000,3000 and 4000 on the x-axis. I'm using MAPLE V.

 

Thanks to the answers received by mapleprime friends, I have made 2 documents. In both documents, i want the expression to be modified and shown in mathcontainer. In my earlier question  "Slider Commands - "value" or value or both are ok" ,   the command " SetProperty (MathContainer0, value,sin(x)" it worked. In the attached doc, it does not work. The same command in updateplot procedure, works, but incorrectly.

Thanks for clarification.

Ramakrishnan V
 

restart

NULL

Function: Examples: "y = a+b*x+c*x^(2)+...; y = a^(x); y = a sin(bx+c)+d;  y = a f(bx+c) + d"

All valid input values for the function ( i.e. for x value, function exists) is domain. This can be visualized by a point in graph (x,y)

restart

 

               

 

 

               

    
                      

 

                

 

 

                 

 

                             

``

``a

a

(1)

b

b

(2)

c

c

(3)

d

d

(4)

NULL

 

 

           

NULL


 

Download doubt2_MathContainer.mw

In the attached document, I have made use of both commands as follows.

a:=GetProperty(SliderA,"value");

b:=GetProperty(SliderB,value);

Both are working alright. How is it possible? Which one is desirable?


 

a:

b:

For sliderA, GetProperty(SliderA,"value") is used.

For sliderB, GetProperty(SliderB,value) is used.

Both are working alright. How? Which one is more desirable?

``


 

Download Doubt_on_SliderCommand.mw

Thanks for answering.

Ramakrishnan V

This works fine, but I was wondering whether it could be done in a simple way.
 

``

restart; kernelopts(version); interface(version)

`Maple 2018.2, X86 64 WINDOWS, Nov 16 2018, Build ID 1362973`

 

`Standard Worksheet Interface, Maple 2018.2, Windows 10, November 16 2018 Build ID 1362973`

(1)

kollect := proc (p::`+`, y) local x; subs(x = y, collect(subs(y = x, p), x)) end proc

kollect(kollect(kollect(kollect(expand(add(mul(k)*add(k), `in`(k, combinat:-choose([i1, i2, i3, i4], 3)))), i1^2), i2^2), i3^2), i4^2)

(i1*i2+i1*i3+i2*i3)*i4^2+(i1*i2+i1*i4+i2*i4)*i3^2+(i1*i3+i1*i4+i3*i4)*i2^2+(i2*i3+i2*i4+i3*i4)*i1^2

(2)

``


thanks in advance,

Harry

Download nested_comb.mw

Can anyone tell me what is the command to calculate maximum absolute error in mapple.

restart;
A002487 := proc (m) local a, b, n; option remember; a := 1; b := 0; n := m; while 0 < n do if type(n, odd) then b := a+b else a := a+b end if; n := floor((1/2)*n) end do; b end proc; listeinverse := proc (L::list) local i; [seq(op(nops(L)-i, L), i = 0 .. nops(L)-1)] end proc; Brocot := proc (n) local c, i, L, M, r; L := NULL; r := 2^n; L := [seq(A002487(i), i = 0 .. r)]; M := listeinverse(L); c[0] := 0, 1/cat(0); for i to r do c[i] := L[i]/M[i] end do; c[r+1] := 1/cat(0); return [seq(c[i], i = 1 .. r+1)], r+1 end proc; for i from 0 to 4 do B || i := Brocot(i) end do;
                              [   1]   
                        B0 := [0, -], 2
                              [   0]   
                             [      1]   
                       B1 := [0, 1, -], 3
                             [      0]   
                          [   1        1]   
                    B2 := [0, -, 1, 2, -], 5
                          [   2        0]   
                    [   1  1  2     3        1]   
              B3 := [0, -, -, -, 1, -, 2, 3, -], 9
                    [   3  2  3     2        0]   
       [   1  1  2  1  3  2  3     4  3  5     5        1]    
 B4 := [0, -, -, -, -, -, -, -, 1, -, -, -, 2, -, 3, 4, -], 17
       [   4  3  5  2  5  3  4     3  2  3     2        0]    
              rang := proc(M::list, a)  ...  end;;
                    /       1\ 
                rang|B2[1], -|;
                    \       2/ 
                / d        \        
                |--- don(x)| t work;
                \ dx       /        

F := proc (N) local a, b, L; L := NULL; L := sort([op({seq(seq(a/b, a = 0 .. b), b = 1 .. N)})]); return L, nops(L) end proc; F(1); F(2); F(3); F(4);
                           [0, 1], 2
                          [   1   ]   
                          [0, -, 1], 3
                          [   2   ]   
                       [   1  1  2   ]   
                       [0, -, -, -, 1], 5
                       [   3  2  3   ]   
                    [   1  1  1  2  3   ]   
                    [0, -, -, -, -, -, 1], 7
                    [   4  3  2  3  4   ]   
rang(F(3)[1], 2/3);
                        /[   1  1  2   ]  2\
                    rang|[0, -, -, -, 1], -|
                        \[   3  2  3   ]  3/

Hi everyone, I have some symbolic expressions as below:

restart;

local(Zeta);

Zeta := phi+(Ems+I*Eml)/(Ef-Ems-I*Eml)+(3*(1-phi))*((1-g)*alpha^2-(1/2)*g)/(alpha^2-1): 

g := (1/2)*Pi*alpha:

Lambda := (1-phi)*((3*(alpha^2+.25))*g-2*alpha^2)/(alpha^2-1): 

Ec := (Ems+I*Eml)/(1-(1/4)*phi*(1/Zeta+3/(Zeta+Lambda))):

a := simplify(Re(Ec)), assuming positive;

the output of the code maple gives me as 'a' is very long and boring! Therefore I want to make it shorter. Since (alpha<<1), I want to set a constraint as (alpha^(2 and more than 2)=0). How can I put that constraint on the output? thanks

sort(abs(z+a+b*i),z,descending) mean type z is sign + but print -z+5i-5

ran := rand(-5 .. 5); -1; a := ran(); -1; b := ran(); -1; sort(abs(b*i+a+z), z, descending)

abs(-z+5*i-5)

(1)

``


Can you help me?

Thank you very much.

Download abs.mw

help pls how to convert a data surface into a region:

surfdata([[1, 1, .69], [1, 2, .48], [2, 1, .37], [2, 2, .44]], axes = frame, labels = [x, y, z], filled = true)

I've tried to fill the volume below using the option "filled " without any results. I will appreciate any suggestion

Hello

 

I need help creating a proceadure that does the following:

 

It takes two lists of the same length N   (0<N<inf), one is the numerical pivote list P and the other is a symbolic target list S.

 

Lets say for the simple case of N=3 that we input:

 

P=[22.5,14.3,78.2]

S=[x[1],x[2],x[3]]

 

First the proceadure will sort the Pivote list P, which will result in a local variable Ps=[14.3,22.5,78.2]

 

Next it will generate the rearanged indices of S when it was transformed into Ps, meaning the sort indices rearangment from [1,2,3] in S into [2,1,3] in Ps. This will result in another local variable PSI=[2,1,3]

 

Finally, the proceadure will use PSI to rearange (sort by proxy) the target list P, which in this case will result in the folowing output of [x[2],x[1],x[3]], where x[i] can be either symbolic variable or numeric.

 

So what I need is to use numeric list P to sort a non numeric list S of the same size.

 

I'd appreciate any tips or usefule commands that I can use in this proceadure. 

 

Thanks

 

 

Dear all,
how to code matrix X properly? I want the index of element of matrix is obtained from set S. Since s = {1,5,6}, in matrix X, i should get x11,x15,x16 and so on.
Do you know how to solve this?

Thank you anyway

Hi people,

I could not find anything similar. I hope I do not repeat and that someone may help me on this one.

How can I most elegantly and quickly create a vector (array, matrix, ...) of individual time dependent variables in Maple 17? Something like

 

myArray := ( (elem_1_1(t), elem_2_1(t), ...), (elem_1_2(t), elem_2_2(t), ...), ... )

 

All suggetions appreciated.

the function rationalize simplify rational expression that contains complicated expression but in this example it doesn't work

rationalize(1/sqrt(x))

1/sqrt(x)

it gives to me the same expression why ?

 

1 2 3 4 5 6 7 Last Page 1 of 1510