I'm only just hearing (haven't experienced) about some serious issues with the 2019.2 updates.  I would recommend waiting for Maplesoft to release an emergency 2019.3 fix update - Maplesoft can NOT leave the last update of 2019 in this state.

Would you help me to figure out how to solve this error?

totalsalesx := 60.1 + tax + profit

tax := 0.3*profit

profit := 0.1*totalsalesx

then, 'Error, recursive assignment'

What I want to do is to calculate the 'totalsalesx' from the cost (60.1). 

After updating to Maple2019.2, the user initialization files maple.ini (Windows) and .mapleinit (Linux), which are placed into the user's home dierectories, are no longer read in upon startup. The behavior of Maple2019.1 was correct, the files were read.

;

= 2*1/10);
                               1
                               -
                               5
= -1;
                               -1

= 10;
                               10
= -25;
                              -25

C= 1;
                               1

= (1/12*sqrt6/sqrtbeta*lambda*mu);
                       1     (1/2)  (1/2)
                      --- I 6      2     
                       24                
= alpha/((10*sqrt-lambda*mu)*beta);
                             1  (1/2)
                           - - 5     
                             4       
A0]= (1/2*alpha/((10*sqrt-lambda*mu)*(1/12*beta*sqrt6/sqrtbeta*lambda*mu)));
                    1    (1/2)  (1/2)  (1/2)
                   -- I 5      6      2     
                    4                       
A1]= -(1/10*alpha/((1/12*beta*mu*sqrt6/sqrtbeta*lambda*mu));
                        1    (1/2)  (1/2)
                       -- I 6      2     
                        2                
A[2] := -(12*((112)*sqrt(6)/sqrt(beta*lambda*mu)))*lambda^2*alpha/(10*sqrt(-lambda*mu));
                    1     (1/2)  (1/2)  (1/2)
                   --- I 6      2      5     
                    20                       
H := ln(sqrt(lambda/(-mu))*tanh(sqrt(-lambda*mu)*(xi+C)));
              /1/2)     /1  (1/2         \\
              ln|- 5      tanh|- 5      ( 1)||
                \5            \5                //
xi := k*x-t*w;
                1     (1/2)  (1/2)     1    (1/2)
               --- I 6      2      x + t    
        2               4         
u[0] := A[0]+A[1]*exp(-H)+A[2]*exp(-H)*exp(-H);
  1    (1/2)  (1/2)  (1/2)
 -- I 5      6      2     
  4                       

                     1    (1/2)  (1/2)  (1/2)                
                     - I 6      2      5                     
                     2                                       
    - -------------------------------------------------------
         (1/2) / 1     (1/2)  (1/2)     1    (1/2)    \\
      tanh|- 5      |--- I 6      2      x + - t 5      + 1||
          \5        \ 24                     4             //

                      1    (1/2)  (1/2)  (1/2)                
                      - I 6      2      5                     
                      4                                       
    - --------------------------------------------------------
                                                             2
          (1/2) / 1     (1/2)  (1/2)     1    (1/2)    \\ 
      tanh|- 5      |--- I 6      2      x + - t 5      + 1|| 
               \ 24              4             // 

plot3d(Im(u[0]), x = -10 .. 10, t = -10 .. 10);

I have a .mapleinit file that amongst other things sets libname so my own packages are accessible and can be loaded using with(). Imagine my surprise when I found that a maple program that ran half an hour ago on Maple2019 bombed when it did not find its package. Closer investigation indicates that maybe .mapleinit is only searched for in currentdir()??

The updated Maple is `Maple 2019.2, APPLE UNIVERSAL OSX, Oct 30 2019, Build ID 1430966`

The old one is gone :-(. It was Maple2019.0. I should add that on this system, Maple is installed on an administrator account that is not my user account (luckily I have access to that). I am running macOS 10.14.6 Mojave.

I verified my older Maples still work as before.

Has anyone else seen this behaviour?

Mac Dude.

Edit: I need to be more specific here: When I double-click a worksheet (.mw file) then currentdir() will be set to the directory the .mw file is in. This has been long-standing Maple behaviour. But then currentdir() does not cover the home directory where .mapleinit sits. As a result, a blank sheet finds my .mapleinit whereas my files (that habitually I open with double-click or drag-drop) do no longer run the .mapleinit file.

Dear all 

I need to animate the following function in two dimensions

,u:=  (x, y) -->x^2+y^2+3

((gradplot(u(x, y), x = -10 .. 10, y = -2 .. 2, grid = [8, 8], thickness = 3, arrows = SLIM, color = u(x, y

thanks

Amr

How to use Fourier transform to extract the part of data which higher than near flat data no matter of scale such as very small decimal value?

would like to extract part when very small decimal small start to increasing or a noise start to appear in time series data.

and then highlight with rectangle in plot for that part of data.

if Fourier transform can not detect this noise or an increasing data or spike then return 0, if detected then return 1

find the moduli of the 5 roots of the polynomial

p(z)= z^5 -3*z^4 -2*z^3 +5

and enter a decimal approximation to the largest modulus in the box below.  Your approximation should be correct to 10 significant figures.

how will we answer to this using maple.

I am trying to animate on maple. I have two solutions 𝑢1(𝑥, 𝑎) = 𝑐𝑜𝑠(𝑥 − 2𝑎) and 𝑢2(𝑥, 𝑎) = 𝑐𝑜𝑠(𝑥 + 2𝑎), for 𝑎 ∈ [1,10], how do I animate them?

Let 𝑦 and 𝑧 and be variables, let 𝑦 =( 𝑎+𝑏𝑧+𝑐𝑧^2)/( 𝑑+𝑒𝑧+𝑓𝑧 ^2) . Use the function solve in Maple to solve for 𝑧 in terms of 𝑦, that is, find a function 𝑧 = 𝑓(𝑦) (in fact, you should be able to find two). Let 𝑔(𝑧) = 𝑎+𝑏𝑧+𝑐𝑧^2)/( 𝑑+𝑒𝑧+𝑓𝑧 ^2)  and compute 𝑔(𝑓(𝑦)) for both of these functions and show that if you simplify the expressions you get a predictable answer. 

I ave already solved the values, however I am unable to simplify these expressions.

I am working with the Physics package in maple. I have a rank 6 tensor, I want to assign the elements of a set (with equal number of components as the tensor) as the corresponding components of a tensor. Entering manually all the components using 'RedefineTensorComponents' is not an option, as it has 4096 components. How can I do this?

Hello everyone!
I wrote proc for Spectral density estimation using Welch's method.

And I want to understand wich fuction is better for computation of Cross-correlation: SignalProcessing:-CrossCorrelation or Statistics:-CrossCorrelation?

Here is my programm with simple signal exmaples:

P.S. (7 hours after initial question) I've just found several mistakes in my PSDw-proc in overlapping.

So, I uploaded new version of my programm. But now I'm not sure in unit of measurement  of power spectral density, but algorithm works correctly.

Spectral_density-test-correct.mw

When plotting a sequence S, plot(S) a series of horizontal lines are plotted. Is there a way to plot a "time series" without having to reconstruct S, e.g., "seq([i,S[i]],i=1..numelems(S))" and plot that? Seems like a lot of work just to make a simple plot.

I am interested in finding the lower Riemann sum for a partition of unequal width.

The points of the partition are P = { -1, -1/4, 1/4, 3/4, 1} , and the function is f(x) = x^2.

My attempt:

restart: with(Student[Calculus1]):
RiemannSum(x^2,x={[ -1,-1/4],[-1/4, 1/4],[1/4,3/4],[3/4,1]},method=lower)

It said error range must be specified. I looked at the help page but I didnt find a specific command for entering partition points manually.

can anyone help me to calculate the exact  value of the eigenvalues of this matrix:
 

Download mat.mw