I would like to plot graph of 2d function f(x, y) = (-ax/(1+y^2), x+by) where x from -5 to 5 and y from -5 to 5 and parameter bar of a and b. Thank you 

Axis properties and line width reverts to some set of defaults each time my work recalculates the plot. Is there a way I can keep the axis properties and line width from changing each time recalculation occurs?

I've used LinearSolve(A,b) to find three unknowns. How do I assign these values to three named variables?

I assigned the resulting vector to a new one

V:=LinearSolve(A,b)

and then, one by one, assigned the elements to variables

C1:= V[1}

C2:= V[2]

C3:= V[3]

But there perhaps is a more elegant way to do this?

As I am new to using the statistics package, I have some doubts about how to perform certain operations in Maple.

For example, let sigma be a variable containing any real number, finding the average is easy, just use the command A0:=Median(sigma) and if you want A (see image below) just take A1:=A0^2. However, the terms that make up <sigma^2> cause a certain difficulty, how to do this? In other words, calculate the B of the image?

sigma := [2, 4, 0, 6]

AMedia := (2 + 4 + 0 + 6)/4;
AMedia1 := AMedia^2;

A0 := Median(sigma)

A1 := A0^2

BMedia := (2^2 + 4^2 + 0^2 + 6^2)/4

sigma0 := sigma^2

sigma1 := Mean(sigma0)

.......................................................................................

hi every one.

in the attached maple file at line x=o in the plotted figure we have some inconsistency in starting the branches from x=0 and the branches do not start from the same value on this axis.

I can not find the problem because there are not any differences between phi 1 and phi 2! 

evalf(f1 - f2)= -5* 10 ^-49

h-x_nemodar-e.mw

Good day,
I am trying to solve the following problem.

For the following system:

With the following initial condition

What are the smallest e₁ and e₂ that would solve the system?
I would try a graphical approach to find them, but I don’t seem to set the correct procedure.
Thanks in advance!

How to clear this error and frame the series

FWF.mw

I thought I was improving my code by adding ::type to all the _self in my OOP code. As this is one main advantage in programming in Maple, which is being able to attach types to all name and variables. Make code more robust.

But it turned out Maple is not very happy now and gives that drearded error

    Error, static procedure ... refers to non-static local or export ... in surrounding scope

Only place I found that adding ::type_name is to _self is allowed, is on the constructor signature.

But in no other method of the object module. local or export method, it does not matter. 

My question is, why is that?

So I went and removed all those _self::type_name and made it just _self to make Maple happy.

I also noticed this happes regardless of having kernelopts('assertlevel'=2): there or not.  Attached  is the worksheet.

Just tryting to understand the logic, that is all. 

This is using Maple 2023.2.1

Download why_adding_type_on_self_gives_error.mw

I just got an email saying a maple primes moderator deleted my question as 'SPAM'. It was not remotely SPAM but a strraight forward question about how to determine lengths of lines drawn in Maple Sketcher. 

The email tells me and gives me a link to 'contact' but it's not clear which of the many possible contacts listed to use!

Here's the email:

Your MaplePrimes post Length of a line drawn in Sketcher? was deleted by a moderator for the following reason: Spam. If you believe this was done in error, please contact Maplesoft customer service: https://www.maplesoft.com/contact.

I'd like to use Maple to make measurements on a map (Dealey Plaza). I can load an image in Sketcher and draw lines on it, but can't figure out how to access the lengths of those lines.

Download DealeyPlazaToo.mw

Dear all

I have a system of differential equation with initial condition. 
I try to get the exact solution bur unfortunattely dsolve does not return the exact solution of my system 

SSDE.mw

Thank you 

Hi,
I have a function (see attached file).  How can I find by Maple 
those values of beta and f for which W will have 
three consecutive local extrema between the
phi=0 and phi_0 where W=dW/dphi=0 at phi=0 and W=0 at phi_0 and W<0 for 0<abs(phi)<phi_0?
Thanks,
plot.mw

Any smarter assumptions or substitutions I could try out on the left handside of the below

If this does not work I would be greatefull for fast numerical evaluation methods. Plotting for example takes to long.

Attached you will find some background on what I want to achieve.

Gaussian_integration.mw

This is probably a real dummy question. Why can I not plot the units in this worksheet? Thanks in advance for your help PlotUnit.mw

I have a pretty ugly nested integral (in my opinion) that I am trying to compute. I thought that I simplified the problem to an easier siutation however during my attempted calculations I am recieving: "Error, (in evalf/int) cannot handle unevaluated name `L` in evalhf" 

I am unsure where this is coming from, I would assume something in procedure or my attempted use of unapply is incorrect. Any comments are welcome, including those that state I am doing this entirely incorrectly. 

Thanks. 

NestedError.mw