## Why maple give empty solutions?...

Why maple give empty solutions? See ref. (12) in the attached wokrsheet. Is there anything missing when deriving Sols?

sols_tw.mw

## Questions re using Maple cloud...

I want to create and modify the same worksheet at different times on two different computers in two different locations.

To avoid transferring files between the two machines, it seems most convenient to reference all objects within Maple cloud.

I am a beginner at this and have several questions:

1) I have downloaded the DirectSearch package as directed in help text but the only result from issuing the command kernelopts(toolboxdir) is " ".

How can I establish a path which enables my worksheet to execute commands within this package?

2) How can my worksheet invoke procedures within my .mla file referencing only objects in Maple cloud?

How can I update (save and delete procedures) within my .mla file?

## How to integrate...

Hello my friends
Please help me solve the integration problem in the attached Maple code below (why was the integration not done in u[4]?) ... Thank you very much

 > u[1] :=  1/3*t^3*x + 2*t*x + (-1)*0.7522527780*t^(3/2)*x + (-1)*0.1719434922*t^(7/2)*x + (-1)*0.01587301587*t^7*x + (-1)*0.1333333333*t^5*x
 (1)
 > u[2] := subs(t=Tau,u[1]);
 (2)
 > u[3]:= int(u[2],Tau = 0 .. t);
 (3)
 > u[4]:= int((t-Tau)^(-0.5)*u[2],Tau = 0 .. t);
 (4)

## Help writing code...

Hello my friends
How can I write the results inside the Maple code as in the picture? That is, writing the results in terms of gamma and alpha

## Common legend for different figures...

Hello,

Is it possible to have a common legend for different figures? I can plot them as Array of Plots (below) but then they each have a legend.

Is it possible to have the two figures side by side and a common legend in the middle?

Thank you!

restart:
with(plots):
A := Array(1 .. 2):
A[1] := plot([2*sin(x), 3*sin(x)], x = -Pi .. Pi, labels = [x, b*sin(x)], color = [blue, red], legend = ["Case of b=2", "Case of b=3"]):
A[2] := plot([2*cos(x), 3*cos(x)], x = -Pi .. Pi, labels = [x, b*cos(x)], color = [blue, red], legend = ["Case of b=2", "Case of b=3"]):
display(A);

## plot of function...

Hey, guys! My Maple 2020 program does not build a plot. that is, it cuts it off. everything is correct in maple 2015.

plot(140^t*exp(-140)/t!, t = 0 .. 300)

Maple 2015

My maple 2020 creates

Why???????????

## How to run programmatically Windows PowerShell com...

I use Maple 2020 on a Windows 10 PC.

The command ssystem("CMD") enables to launch any Windows command accessible from the shell.
But how to launch a PowerShell command?

For instance ssystem("get-process") returns -1 (not surprising in fact for get-process is not a shell process).
How can I tell Maple that this command is to be found in the PowerShell ?

And even, I this possible for, in the ssystem help page, it's said that not all the command can be launched by ssystem

TIA

## How can these three Watt's curves be plotted in th...

Two of the three Watt's curves plotted in this worksheet display with gaps.

Why is this and how can these curves be displayed without gaps?

WattsCurve.mw

## error, null fix?...

Hi

Keep getting "Error, null" on every calculation i make. It indicates hidden spaces or something weird????.

Screenshot of it is included.

https://imgur.com/a/wSdUeqe

Would be great with a fix or some help because this is driving me mad....

## What is the proof that Neile's semi-cubical parabo...

The uploaded worksheet is a failed attempt at this proof.

Please either refer me to or show me a valid proof.

*** I have tried to upload my worksheet using the green arrow but the insert link operation of the upload failed ***

cc

Error occurred during PDF generation. Please refresh the page and try again

## Plotting a one dimensional curve with implicitplot...

I want to plot the solutions of the equation (x-y)^2+(1-z)^2=0.

However, implicitplot3d is not able to plot them, at least using the default arguments. Any recommendations?

I know a priori that it is going to be a curve contained in a plane in case that makes this task easier.

## "fsolve"-ing an expression containing a cosh-funct...

Can anyone tell me what this means? (workfile maple.file.mw)

## how I can convert this maple code to matlab ones?...

how I can convert this maple code to Matlab ones?

 >
 >

## Can this apparent contradiction be explained?...

This worksheet displays an intersection between two spheres based on a test which seems unrelated to the display.

How can this be explained?

Intersecting_spheres.mw

## evalf/Int issue with Maple 2020...

Hi,

This chunk of code gives me almost instantly the desired result with Maple 2015 but fails returning a result after 5 minutes when ran from  Maple 2020.
Changing the method or trying to tune their options doesn't fix the issue (for a larger value of the absolute tolerance the result, close to 1, is even obviously false).

TIA

 > restart;
 > interface(version)
 (1)
 > with(Statistics):
 > Model_1 := (X, Y, Z) -> 1.3479120558270161+(-1)*.3390713110446567*X+1.0332964944900824*Y+(-1)*.8046331250569234*Z+0.9028899142595827e-1*X^2+(-1)*.28022910356641223*Y^2+1.3698461513469624*Z^2+0.6023630210658247e-1*Y*X+(-1)*.1988111077193626*Z*X+.6782902277463169*Z*Y+(-1)*0.7589729001497135e-1*X*Y*Z: Model_2 := (X, Y, Z) -> .7215754021067852-.961682838202105*X+.4890842364596477*Y-.8214961524335734*Z+.15745942215497866*X^2-1.8023544416693338*Y^2+.36598799463016246*Z^2+1.3957614823018496*Y*X+.725398415577742*Z*X+1.9474707393604542*Z*Y-1.1780201448596594*X*Y*Z: ExpMod_2 := unapply(expand(Model_2(Model_1(X1, Y1, Z1), Y2, Z2)), (X1, Y1, Z1, Y2, Z2)):
 > fy1 := PDF(Normal(0.1055, 0.0297), Y1): fz1 := PDF(Normal(1, 0.2/3), Z1): fy2 := PDF(Normal(0.17, 0.0476), Y2): fz2 := PDF(Normal(1, 0.2/3), Z2): C   := evalf(          (1-eval(CDF(Normal(0.1055, 0.0297), Y), Y=0))          *          (1-eval(CDF(Normal(0.17, 0.0476), Y), Y=0))          *          (eval(CDF(Normal(1, 0.2/3), Z), Z=1.2)-eval(CDF(Normal(1, 0.2/3), Z), Z=0.8))^2        ): J  := Int(         fy1*fz1*fy2*fz2*(1+tanh(10^4*(ExpMod_2(2.14, Y1, Z1, Y2, Z2)-1.25)))/2,         Y1=0..0.4,         Z1=0.8..1.2,         Y2=0..0.4817,         Z2=0.8..1.2,         method = _CubaDivonne, methodoptions=[absepsilon=1e-8]       ): Prob(X__2 > 1.25) = nprintf("%1.3e", evalf(J)/C);
 (2)
 >