https://www.mapleprimes.com/questions/219048-Help-File-Edit-After-Storing-In-A-Database

I found a previous post which contained a worksheet script for creating help, but this example is likely out-of-date. Can anyone provide a similar example for post-2018 help files to save me considerable trial and error.

Hi, I am a beginner of maple and I met a problem recently.

I extracted some equations from a .txt file like below:

> read “D:/blablabla/filename”

                       EQ_1,EQ_2,...

Then I want to collect all these equations to make a list EQlist=[EQ_1,EQ_2,...] but the following code doesn't work:

> EQlist:=read “D:/blablabla/filename”

Error, invalid assignment

Could anyone tell me how to construct such EQlist?

Thank you in advance.  P.S. I can't just copy and paste because these commands are supposed to be in a loop.

Is this a bug?

eq:=5*x+y-10=0:
eq2:=y=solve(eq,y):

f:=(x,y)->eq2
                              
f(3,1)
                   

I think the way I applied it above is a bit unorthodox to Maple but maybe it is a bug.  Normally I think we use unapply in this situation. 

f:=unapply(eq2,x,y)
                             
f(3,1)
                     

Okay better, but I think that first way should work no?

I am trying to isolate theta/V in this equation, but Maple will only allow me to solve for either theta or V. Is there a way to make Maple solve for the expression instead of the variable?

I have attached the Maple document below. It contains some other stuff but it is mostly this equation I am interested in. It can be found near the bottom. I hope someone can help.

Best regards

Opdelt_TF_Maple.mw

restart;
with(DEtools);
DEplot(diff(y(t), t$2)-3*(diff(y(t), t))+2*y(t) = exp(t), [[y(0) = 0, (D(y))(0) = 2]], stepsize = .1, linecolor = black, thickness = 2);

Hi,

I'm trying to change with a Maple Worksheet the parameters of a MapleSim Model in Real-matrices format.

is there any way to do that?

actually i get the failure note:

<<Error, (in SetParameters) non-vectorized values in vector parameters: [list= ""]>>

Thank You

Regards
Johann
 

Hello everyone,

I'm studying an equation with three variables similar to the following:

Now, I would like to obtain the numeric values of x associated to (y, z) that are free to assume any integer value within the intervals [-1...5] and [0...5] respectively. Thus, I should get 42 values of x overall. The question is very similar to the one asked here: https://www.mapleprimes.com/questions/146636-How-To-Solve-An-Equation-In-Three-Variables but in my case I would like to obtain all the 42 values of x (included undefined solutions) associated to the sets (y,z), possibly arranged in a 42x3 matrix where the columns are the variables (x,y,z) and the rows the values (x,y,z) that satisfy the equation.

I started to tackle the problem using a for loop:

for y from -1 by 1 to 5 do

    for z from 0 by 1 to 5 do

        eq:= fsolve(x*y + z, x);

    end do;

end do;

eq;

But it returns only one value: -1.000. Any help is appreciated.

Thank you for your time.

I'm trying to plot this integral but without success. Could someone help me?  I tried it the following way.

Thanks in advance for any help!

integral_test.mw

Why on earth is Maple giving me all these solutions compared to last year??

Last year:

Now:

Hi all;

I hope all is well with you.

I am regular user of Maple for 7 years. I just reinstalled it to a new version, Maple 2019.

After installation, which was very smooth and without any unexpected problem, I opened a new document and entered a simple task; “sqrt(4);” the answer was

1.81847767202745*10^(-58) + (7.53238114626421*10^(-59))*I

I am pretty sure that I am missing something. The answer is obviously incorrect and there is a problem, but where.

I would be thankful if someone could help me with this issue.

Best

Farzad

Hi all,

I'm using dsolve (numeric) for a system of ODE with initial conditions.

Is it possible to show (at the same time with solving) the values of time and an unknown when solving a system of ODE before the end of calculation. Of course, the calculation time is high and I want to know before the calculation is finished if the solution is converging.

Also, I use the option range in my calculations from 0 to 200s (seconds) and more. I do'nt know how I can speed up the solution with less memory.

Please find in the attached file an example.

dsolve1_1r.mw

Thank you in advance for your help.

Hi folks!

Is there any way to make this kind of derivative?

If necessary, I can provide the original file here.

Thanks in advance for any help!

choosing lightmodel=none and shading=none, produces a dark grey grided surface
plot3d(x*y, x = 0 .. 10, y = 0 .. 10, lightmodel = none, shading = none)

adding the style=wireframe option gives a blank plot.  Grid probably white?  Changing style to patchnogrid the surface is indeed white. However chosing both shading and style options to none regardless of the lightmodel will produce a plot that appears empty.  Is this to be expected?

However, just the style=wireframe option produces a colored grided wireframe as to expect
plot3d(x*y, x = 0 .. 10, y = 0 .. 10, lightmodel = none, style = wireframe)

Projection will not work with orientation. 

plot3d(x*y, x = 0 .. 10, y = 0 .. 10, projection = 0.2)
                                                        

plot3d(x*y, x = 0 .. 10, y = 0 .. 10, projection = 0.2, orientation = [55, 75, 0])
                                                

Hello colleagues,

I would like to get a suggestion on how to utilize an existing `simplify` function or to define an operator, which allows the following simplification:

— Alexander