## How to convert string integer into integer?...

How to convert "123" into integer 123

i use sprintf %d still can not convert to integer

## system of inequation solve...

Hi,

I would like to plot the region of solution of the following system defined by some equations.

restart; with(Optimization);
with(plots);

inequal({-5 <= 4*y1+2*y2+3*y3, -2 <= 3*y1+5*y2+2*y3, -1 <= y1+2*y2+y3, 0 <= y2, y1 <= 0}, {y1, y2, y3}, color = "Nautical 1");

Many thanks for any help

## AFactor doesn't factor a (supposedly) reducible po...

I have the following Polynomial F. Computing the genus shows that this curve has negative genus and thus is reducible. But using AFactor doesn't produce a factorization. Any ideas?

```with(algcurves):
F := z^9+(-3/2+(3/2*I)*sqrt(3))*y^3*z^6+(-3/2-(3/2*I)*sqrt(3))*x^3*z^6+(-3/2-(3/2*I)*sqrt(3))*y^6*z^3+(-3/2+(3/2*I)*sqrt(3))*x^6*z^3+y^9+(-3/2-(3/2*I)*sqrt(3))*x^3*y^6+(-3/2+(3/2*I)*sqrt(3))*x^6*y^3+x^9-3*(x*y*z)^3:
z:=1:
genus(F, x, y);
evala(AFactors(F));
```

## Maple Code for 4th order Runge-kutta Method for OD...

Pls what is the maple code for the fourth order Runge-kutta method for five systems of ODE of several variables?

I want to be able to make arrows on my axis to indicate positive direction, since it is a requirement at my school. I would like to do it with the "plots" function.

Here is what I wish I had in maple http://imgur.com/a/OXi5t

## Can this code be done with only one do loop?...

Hi Mapleprimes,,,

We see Maple file.

We are aware of oeis.org/A103435/

sequence data

0 2
1 4
2 16
3 48
4 160
5 512
6 1664
7 5376
8 17408
9 56320
10 182272
11 589824
12 1908736
13 6176768
14 19988480
15 64684032
16 209321984
b103435

Where F(m)=2*F(m-1)+4*F(m-2).

Goal - to increase refereed database.

M.mw

Regards,

Matthew Charles Anderson

Legislative Assistant

Oregon USA

Age 42.

## "How can I solve this error in Maple?"...

5*x-7 = 3*x+2;
"(->)"
lhs(5*x-7 = 3*x+2) - rhs(5*x-7 = 3*x+2) = 0;
2 x - 9 = 0
[x]
isolate( 2*x-9 = 0, %ARG1 );
Error, (in isolate) 2*x-9 = 0 does not contain %ARG1
plz explain me what is this error?

## Do maple have a Boolean simplify?...

If input a group of outputs which are binary numbers

can it simplify to give a logic that can output these outputs

## How to output a statistic of a list of items...

If input ["1","1","2","2","2","77"]

output a graph such as

1 has 2 times

2 has 3 times

77 has 1 time

## How to take the integral from a function solved nu...

3.mw

There are 2 questions actually. The first as the title says is about taking the integral. I have 2 functions that were found numerically from the system of differential equations (see the file), and I need to take the integral of the expression that includes both of them. Maple gives me something like Int () = Int (), so it doesn't solve anything. Why can it be?

The second question is about varying the boundary conditions. If, for example, I have the system with the condition like R(x_0)=R_0, can I get the plot  of R(x,R_0)? In my case I need to vary conditions on R and mu (R(0)=R_0 and mu(0)=mu_0) and then get the plot of the integral in relation to R_0 and mu_0. Is it even possible?

Hello,

I have two simple module's:

1) ------------------------------------------------------------------------

```Point := proc(xx::float,yy::float)     return module()         local x := xx,y := yy;         export ShowPoint,GetX,GetY;                  ShowPoint := proc()             printf("Point X,Y -> [%f,%f]",x,y);         end proc;```

```        GetX := proc()             return x;         end proc;                 GetY := proc()             return y;         end proc;         end module: end proc:```

2) ------------------------------------------------------------------------

```PointMath := module()     option package;       export `+`;          `+` := proc(a::Point(float,float),b::Point(float,float))         option overload;         Point(a:-GetX()+b:-GetX(),a:-GetY()+b:-GetY());     end proc; end module: ```

------------------------------------------------------------------------

Next I use first module:

`p1:=Point(1.2,1.4);`

`p2:=Point(1.0,2.0);`

Finally I want to add above two points:

`with(PointMath)`

`p2:=p1+p2`

`The results is:`

`p2:=p1+p2`

Why is not called operator '+' and two points are not added?

Best,

Rariusz

## Select remove in partitition...

Hi

How can I remove a subset containing a number from a partition?

eg S := [seq(2..5)]

P:=combinat:-setpartition(S, 2);

[[[2, 3], [4, 5]], [[2, 4], [3, 5]], [[2, 5], [3, 4]]]

I want to remove any partition involving 5

leaving

[[[2, 3]], [[2, 4]], [[3, 4]]]

i tried

remove(has,P,5)

## compute integral...

Can someone answer why i get Float(undefined) while computing integral

Here is my example

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## How to change a string of binary numbers into a ch...

"01000001" is A

how convert string of binary into a characters?

and

how to convert this string into 65 too?

## QDifferenceEquations ...

Dear All,

restart;

with(QDifferenceEquations);

z := .8; q := .9;
0.8
0.9
QGAMMA(z, q);
Error, (in QDifferenceEquations:-QGAMMA) wrong type of arguments
How do we get the numerical result from Maple? It just only do algebraic calculation.

Thanks

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