## Double series produces a list....

Good day!

I am working to solve a double series (LP  minimization) problem of the form

However, this returns a set [ ].

Since LPSolve does not operate on a set (removing the brackets manually will enable LPSolve to obtain the solution), can anyone suggest what is wrong with the structure of this z-equation? x, y are matrices and z is a column vector.

Thanks!

## Conditions for inequalities and Visualizing equati...

Hello everyone!

Total beginner here. So far I am just using the right click options in Maple,  and worked wonderfully until now.

Two questions for some charitable sould out there:

1) I have a system of inequalities that I need to solve. I am interested in the *conditions between the variables under which a given inequality is satisfied*.

Using the "solve" command I only get a few of these. Do you know any script that can obtain more solutions?

2) I have some (long) equations and want to be able to visualize them in different ways to make sense of it. So far I have only been using "simplify" and "combine", but it keeps on returning the same result even if I can see there are other possible ways of factoring the equation. How can I tell Maple to give me "different optiosn" as to visualize the equation?

Thank you all!!

## Regularize and evaluate an integral...

Is there a way in Maple to evaluate the following integral - where the "w" are set to go to zero to avoid singularities? B.t.w. Maple just returns the integral unevaluated with or without the "w" with the simple "int" command.

`int(ln(((p1-p3)^2+w^2)/(p1+p3)^(w^2+2))*ln(((p1-p4)^2+w^2)/((p1+p4)^2+w^2))*sin(p1)/(p1*p3*p4), p1 = 0 .. infinity);`

or even

`int(ln(((p1-p3)^2+w^2)/(p1+p3)^(w^2+2))*ln(((p1-p4)^2+w^2)/((p1+p4)^2+w^2))*sin(p1)/(p1*p3*p4), p1 = 0 .. 100, numeric);`

## Anaglyph or stereo image...

Here's something neat to be done in Maple.
This anaglyph or stereo image uses the red green glasses to make the model appear more 3 dimensional.  The static-non-stereo image of the animated plot below is done in maple by plot3d(sin(x*y)^2,x=-2..2,y=-2..2,scaling=constrained)

Anyone?

## how i can pdsolve these partial differential equat...

hi

how i can pdsolve these partial differentialequations?

thanks

 (1)

 (2)

 (3)

 (4)

## Memory allocation issue while finding inverse lapl...

Dear Maple  users,

I am facing the memory allocation problem while calculating the inverse Laplace transformation of a big expression. I have many such terms (401) and I am importing them from a text file.

For an individual term itself, Maple consumes huge memory but at the end, it is able to calculate it in about an hour. I want to automate the process of reading and writing the terms one by one from the different text files. While doing so, maple eats a lot of memory and I see the error msg

"Error, (in expand/bigprod) Maple was unable to allocate enough memory to complete this computation.

Is there a way to do so? The maple file is attached.

InvLaplace_ex.mw

Thanks,

## Minimum Distance of Error Correcting Code...

I´m new to Maple and I´m trying to find the minimum distance of an ECC from its parity check matrix or the generator matrix. Is this possible?

## evalf[d] and Digits...

A fact that seems to be not documented. Probably it should be obvious.

Digits := d0
evalf[d](expr);

The toplevel float sub-expressions in expr  are computed with Digits=d0 but in procedures Digits is set to d.
Notice that the actual float parameters of the toplevel procedures are evalf-ed with Digits=d0.

 > restart;
 > g:=proc() convert(1/3., string) end: h:=proc() 1/3. end:
 > Digits:=3; evalf[10]([   1/3. = h(),   convert(1/3.,string) = g(),     fsolve(3*x=1) = add([1/3]),   fsolve(x/3=1/9.) # 1/9. being at top level is evalf-ed with Digits=3 ])
 (1)
 >
 > k:=proc(x) convert(x,string) end:
 > kernelopts(floatPi);
 (2)
 > 4.+Pi;
 (3)
 > evalf(k(1/3.+Pi)); # floatPi seems to be ignored inside actual parameters
 (4)
 > evalf(k(4+evalf(Pi)));
 (5)
 > evalf(k(4+Pi)); # 4 not being float (or "infected" by a float) is not evalf-ed
 (6)
 >
 > ### (this is documented)
 > `evalf/h` := proc() 7.777 end:
 > evalf(h(1/3));
 (7)
 > evalf('h'(1/3));
 (8)
 >

(edited)

## collect with fractional powers...

```collect((sqrt(x)+y)^2, [x, y], distributed);
(sqrt(x)+y)^2```

I think this is wrong. Documentation says that collect supports fractional powers of the variables, so in this case collect should return x+2*sqrt(x)*y+y^2.

## How to solve a problem foat(infinty)...

كيفية حل مشكلة فوات (إنفينتي)

## Why is evaluation taking so long?...

After waiting about six hours for the worksheet to be executed, I finally lost hope and stopped it. (My CPU usage was stuck on 100% the whole time and I almost ran out of memory) Is this evaluation time normal and should I have waited longer, or is there a problem with my worksheet? (I'm uploading it here) Or is it possible that the equation cannot be solved by Maple at all?

parasitic.mw

## how to draw table/graph for different t on f'' or ...

help me on thispde_solutionalpha.mw

 (1)

## C# openMaplle exporting two plots...

Exporting one plot in program works well:

MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph.jpeg\",plot(sin(x)*cos(2*x)));");

But if I'm trying to export two plots, program stops working and prints no exception:
MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph.jpeg\",plot(sin(x)*cos(2*x)));");
MapleEngine.EvalMapleStatement(kv, "Export(\"D:\\\\MyGraph2.jpeg\",plot(sin(x)*cos(2*x)));");

What is the cause?

## f(s) vs. f(1.*s)...

```f := (s) -> -HankelH1(1, s)-2*I/Pi*BesselK(1, s);

evalf(Int(f(s), s = 0 .. 1));
-0.2348023134 + 0.3562894462 I

evalf(Int(Re(f(1.*s)), s = 0 .. 1)+I*Int(Im(f(1.*s)), s = 0 .. 1));
-0.2348023134 + 0.3562894462 I

evalf(Int(f(1.*s), s = 0 .. 1));
-0.2094198744 + Float(infinity) I```

I don't know if the third one is really an issue, but given that the first two work fine, looks suspicious.

## How to export plots using OpenMaple in Java...

How can i export a plot using open maple in java?

`engine.evaluate("Export(\"D:\\MyGraph.jpeg\", plot(sin(x)));");`

and

`engine.evaluate("exportplot(\"D:\\MyGraph.jpeg\", plot(sin(x)));");`

doesn't work,

exception - com.maplesoft.externalcall.MapleException: Error, (in Export) exported file D:MyGraph.jpeg could not be createdError, plotting was not implemented by the application

Thanks.

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