Consider

restart;
L := [1,2,3,4];
x[j];
seq(%, x[j] in L);
x[j];

What would you expect the output of the last line to be?

Answer:   Maple says 4.   Why?

Hi, 

In Maple it's possible to say that some quantity x has a value of 1 and that its unit is the meter (for instance).
But is it possible to say that x is a quantity whose fundamental unit is the 'length' (or any other fundamental unit, I insist on this point: I don't want to use derived units such as 'force', 'speed', ...)?

I think that the Units package doesn't allow to do this (or maybe I didn't figure out how).

Do you have any suggestions about that?

TIA

This is my notebook

I don't understand why computing the wedge product of two differential forms gives me an output which prints the product of both. Why  don't it just return d rho ^ dt?

Hi Everyone, So i have a pretty ugly function which i am interesting in plotting. When i plot it seems that all values are real however when i do evalf with specific values of variable i am plotting over it shows that it is complex. Any thoughts on how to get it to stop plotting once it becomes complex? See attached maple file.

ComplexPlotQuestion.mw

Thanks. 

1. Plot the solid that lies between the cone z=(x^2+y^2)^(1/2) and the plane z = 4.

2. Plot the solid that lies above the cone z=(x^2+y^2)^(1/2)  and below the sphere z=x^2+y^2+z^2.

3. Plot the solid that is inside the hemisphere z=sqrt(25-x^2-y^2) , outside the cylinder x^2+y^2 = 4 and above the plane xy − plane.

4. Plot the solid bounded by the hemisphere z=sqrt(16-x^2-y^2)and the paraboloid z=x^2+y^2.

5. Plot the solid that lies within the sphere x^2+y^2_z^2=4 , above the xy − plane and below the cone z=sqrt(x^2+y^2).

Dear Community,

I have a simulation in MapleSim, and I have a probe in the system, for which measured data are also available. How can I load these measured data into MapleSim and compare them to the calculated results (probe data) visually? (Preferably in the "Analysis Window: Simulation Results" which pops up by pressing F6)

Tx for the kind help in advance,

best regards,

Andras

This proc is valid, yet Maple mint thinks there is syntax error

foo:= proc(x)
local z := "";
    if not x in ["A","B"] then
        return;
    fi;

    z:=cat("A
            B");    
end proc;

mint t.mpl gives

on line     7:     z:=cat("A
                          ^ Syntax error
A "then" was found without a previous matching "if".
An "end" may be needed to close the "in" construct from line 3.

But these two below procs below it gives no syntax error

foo:= proc(x)
local z := "";
    if not x in ["A","B"] then
        return;
    fi;  
end proc;

And

foo:= proc(x)
local z := "";
    z:=cat("A
            B");    
end proc;

No syntax error on either one. the syntax error only shows up when combining them. 

What does if not x in ["A","B"] then  have to do with the cat  below it? And why when they are combined, the syntax error shows?

I know of workaround, such as changing the cat to  z:=cat("A\nB");     or keep the strings on two lines, but do it like this

    z:=cat("A\n
           B");

Or write it like this

   z:=cat("A "
           "B"); 

But none of these changes were needed before adding the not x in ["A","B"]  before.

Is this a bug in mint? Is there a work around so the first example above still works using 

    z:=cat("A
            B");   

?

Hi,

I didn't use Maple before, I want to use it in this problem 

How to get the displacement equation of the longitudinal vibration of rod (bar) when the boundary and initial conditions are 

Dear Maple Users @acer @Carl Love @Kitonum @Preben Alsholm ,

Greetings.

How to plot a function "Am" for various values of "kt"(eg: kt=-1..1) at a point x=0.

Am vs kt.

The code has provided below.

Waiting for your response.

ktplot.mw

Hallo;
the following MAPLE code generates 2-vectors. To collect them into a set K unfortunately does not work. K contains vectors two-fold etc. So K is not a set which I hoped to get. What is wrong?

restart:m:=5;#m Module
with(LinearAlgebra[Modular]):
K:={};
M:=Matrix([[3, 4*168], [4,3]]);
L:=Matrix([[3],[4]]);
#with(LinearAlgebra[Modular]):
for s from 0 to 10 do
a:=Mod(m,(M^s).L,integer);
K:=K union {a};
od:
K:=K;

Gerd

Hi experts

with(plots):
#epsilon:=5*Pi/2:
gammaa:=0.4:
gammao:=0.1:
gammab:=0.002:
omegab:=100:
X:=60:
Omega:=6*Pi:
g:=10:
sigmag:=5*gammaa:
a:=1/(sigmag*sqrt(2*Pi)):

#deltao:=1:
D7:=evalf(a*int(g*Omega*(gammao/2-I*Delta)*exp(-0.5*((Delta-deltao)/sigmag)^2)/(gammao^2/4+Delta^2),Delta=-infinity..infinity)):
D8:=evalf(0.5*a*int(g^2*gammao*exp(-0.5*((Delta-deltao)/sigmag)^2)/(gammao^2/4+Delta^2), Delta=-infinity..infinity)):
D9:=evalf(a*int(g^2*Delta*exp(-0.5*((Delta-deltao)/sigmag)^2)/(gammao^2/4+Delta^2), Delta=-infinity..infinity)):
b1 := (deltao-2*X^2*omegab*Y/(gammab^2+omegab^2)-D9)^2:

 f:=Y*((gammaa+D8)^2+(b1))=Im(D7)^2+(epsilon-Re(D7))^2:
#P1:=implicitplot(f,deltao=-70..50,Y=0..1,numpoints=100,axes=boxed,thickness=2,color=black,font=[1,1,20],tickmarks=[4, 3],linestyle=1);

implicitplot3d(f,Y = 0 .. 1,deltao=-40..40,epsilon=0..0.4,numpoints=100,labels=[Y,deltao,E],tickmarks=[3,3,3], style = surface, color = "Niagara Azure");

The above code to plot the implicitplot3d ,

first the figures are not smooth

second thing is how to make contourplot at epsilon= 5*Pi/2.

I appreciated any comments

i wanna solve a system of equations using ''fsolve'', I have found this example:

fsolve({2*x-x*y=0,-y+3*x*y=0},{x,y}, {x=0.1..5,y=0..4});

but i wanna understand how does this work,and what is the signification of term 

thank you for your help.

This exact value of this serie must be calculated with help of a integral and another serie (Maclaurin)

Note: there is Taylor serie and Maclarin is a special case of this Taylor serie. 

The serie is also numerical in Maple calculated , to get a idea of the exact value 

foroum_vraag_3_inleiding.mw 

I enclosed some book taks pdf about alternating series /infinite series and products 
to get a idea what is asked for  

blz_62.pdf

blz_63.pdf

blz64.pdf

blz66.pdf

blz_67.pdf

blz68.pdf

Let say the procedure MyProc returns two variables as

A,B:= MyProc(…);

However, for programming purpose, I do not want to create an unused variable. Assuming one only needs B, not A, is there a way not to create and assign A?

For information, in Matlab, it is a commonly used technique. The syntax is

[~,B]= MyProc(…);

In Maple, the meaning of ~ is different, but I am looking for something similar.

 Today I read the  Problem 5.21 from book Maple and Mathematica, A Problem Solving Approach for Mathematics:

The book uses following codes:

But I think  these codes just verify rather than prove(n is always specific number). This example is not difficult to prove by hand. but I'd like to know Maple how to prove it. It seems not easy.