Is it possible to check, if a component - like a combobox - exists?

Why is a row of a matrix has type Matrix, but a column of a Matrix has type Vector (column vector)

I expected a row of a matrix to also be a Vector (row vector).

restart;
A:=Matrix([[1,2],[3,4]]);
A(1,..);
whattype(%);

A(..,1);
whattype(%);

This might be by design or documented somewhere. But I find it not consistent.  Either both results should be Matrices, or both should be Vectors (the more logical way).

Maple 2020.2 on windows 10.

I want to write two different numbered lists in the same document like:

1. Item one list one
2. Item two list one

And the second list:

1. Item one list two
2. Item two list two

The problem is that whenever I use the "Set the paragraph to be a numered list item" button, the item becomes a part of the same list as every other list item in the document. How can i separate two lists?

Hello!

how to get a table with Relative Error and Absolute Error in Maple?

I tried in (https://www.maplesoft.com/support/help/Maple/view.aspx?path=Student/NumericalAnalysis/RelativeError) but was unsuccessful.

Thank you!

Ivi

Hi, how to write a loop and solve the algebraic expression? is the loop and do loop are the same thing? if different then pls mention how to solve the same question by using do loop?

solution_loop_help.mw

Suppose that we have a excel file as follows:

We can import the excel file to Maple as follows:

restart:
ExcelTools:-Import("C:\\Users\\student\\list.xlsx", "Page1");

• QUESTION 1: How to filter the cell including ".edu" in the column A and how to print them to column B as follows:

Hi everyone how can I plot like a graphic? 

I am having problems with the code I am trying to write in Maple 2020. I have attached the code in this question. 

I hope someone can help me out.

Error, invalid input: rhs received 0, which is not valid for its 1st argument, expr

Thanks very much
 

Download EXAMPLE.mw

Hi, how to find the point where two lines intersect each other by using the command.

Help_point_of_intersection.mw

Hi, pls help me to write a loop for prime number....for n between 1 to 100

help_prime_number.mw

Hello,

When I typ:

> phi; kappa;

It gives symbols φ and K.

I do not want this, I want the words phi and kappa.

How do I turn this off?

I understand it has something to do with SYMBOL or a Palette?
I see a Palette left named 'Greek' or 'Trigonometric & Hyperbolic' that have phi in them, but how do I delete a Palette (If that is how I stop these symbols)?

I'm not really good with the software, I just use it for some school work.

Thank you in advance for your help!

Hey

Is it possible to draw a slope field for a second order differential equation with initial conditions?

Hi

I am asking for your help, as I would like to know if it's possible to integrate a function using SI-units.

This is what I get when I try:

Copied directly:

with(Units[Standard]);
∫10 ⟦m⟧/(⟦s⟧^(2))ⅆ⟦s⟧
Error, invalid differential
                       /      (m)                         
Typesetting:-mambiguous|int10 ----Typesetting:-mambiguous(
                       |         2                        
                       \      (s)                         

                                                                \
  DifferentialD(s), Typesetting:-merror("invalid differential"))|
                                                                |
                                                                /

Why 3D .eps figures produced by Maple 2020 are often excessively large?

So, it´s a little heavy to the viewer and to compile to PDF.

• How could we reduce the size without losing any quality? 

Is the following function w 

equal to next functions for a=1 or a= -1?

if a=1 then 

w=

if a=-1 then 

w=

where n>1, B,c and k are arbitrary constants.

################################ 
restart:
a:=-1:
B:=0:
c:=2: 
h:=1:

#assume(n>1):
n:=3:
assume(0<=x and x<h):
assume(0<=t and t<h):  

a:=-1:
if is(a>0)=true then
omega:=(x,t)->((2*c*n/(a*(n+1)))*(sin ((x-c*t+B)*sqrt(a)*(n-1)/(2*n)))^2 )^(1/(n-1));
print(omega(x,t));
elif is(a<0)=true then 
omega:=(x,t)->(-(2*c*n/(a*(n+1)))*sinh ((x-c*t+B)*sqrt(-a)*(n-1)/(2*n))^2 )^(1/(n-1));
print(omega(x,t));
end if:

plot3d(omega(x,t),x=0..1,t=0..1);
################################

################################
restart:
a:=-1:
n:=3:
c:=2:
r:=0:
k_1:=0:
k_2:=0:
h:=1:

n:=3:
assume(0<=x and x<h):
assume(0<=t and t<h):  
if a=1 then
  omega:=(x,t)->piecewise(abs(x-c*t)<=2*n*(k_1-r)*Pi/(k_1*(n-1)),(sqrt(2*c*n/(n+1))*sin ((x-c*t)*(n-1)/(2*n)+r*Pi/k_1))^(2/(n-1)),0);
print(omega(x,t));
elif a=-1 then
  omega:=(x,t)->(sqrt(2*c*n/(n+1))*sinh ((x-c*t)*(n-1)/(2*n)+k_2))^(2/(n-1));
print(omega(x,t));
end if:


plot3d(omega(x,t),x=0..1,t=0..1);