Math problem

[Sebastián]

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be from
a predefined set of posible values. Is there an "easy" way to do that????

TIA,
Sebastián

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

What you can do is get the probables values in an array, then select a
randon from 0 .. array.length - 1

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????

TIA,
Sebastián

[Anders Borum]

Here's a solution:

Create an array with the size of the number of dedired values. Populate the
array with the desired values, then find a random position in the array
(using the length of the array as part of the randomization).

How about that?

--
venlig hilsen / with regards
anders borum
--

[Morten Wennevik]

On Mon, 13 Dec 2004 08:37:57 -0500, Ignacio Machin ( .NET/ C# MVP )
<ignacio.machin AT dot.state.fl.us> wrote:

Hi,

What you can do is get the probables values in an array, then select a
randon from 0 .. array.length - 1

Cheers,

If the values can be picked only once (ie a card deck) use an ArrayList
and remove the picked 'card'.

--
Happy Coding!
Morten Wennevik [C# MVP]

[WRH]

Hello

Something like this should work..

Random random = new Random();

int [] predef = {15,22,33,6,.....};//eg, 25 predefined mumbers

int index = random.Next(0,25);//get a random index

int num = predef[index];
"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????

TIA,
Sebastián

[Nicholas Paldino [.NET/C# MVP]]

In addition, if the set is contiguous, then you can just use the
overload of Next on the random class and it will return a number in that
range for you.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:OK**************@TK2MSFTNGP14.phx.gbl...

Hi,

What you can do is get the probables values in an array, then select a
randon from 0 .. array.length - 1

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????

TIA,
Sebastián

[Sebastián::PJ]

Gracias Ignacio...
So, I should create an array with the values I want the numbers from???
How do I get those values randomly?

Saludos.-
"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote
in message news:OK**************@TK2MSFTNGP14.phx.gbl...

Hi,

What you can do is get the probables values in an array, then select a
randon from 0 .. array.length - 1

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????
TIA,
Sebastián

[Anders Borum]

Here's some code I just put together ..

int[ ] list = new int[5];

list[0] = 1;
list[1] = 23;
list[2] = 34;
list[3] = 45;
list[4] = 56;

int foundNumber = list[new Random().Next(list.Length)];

--
venlig hilsen / with regards
anders borum
--

[Sebastián::PJ]

It is not contiguous...

"Nicholas Paldino [.NET/C# MVP]" <mv*@spam.guard.caspershouse.com> wrote in
message news:%2****************@TK2MSFTNGP15.phx.gbl...

In addition, if the set is contiguous, then you can just use the
overload of Next on the random class and it will return a number in that
range for you.

Hope this helps.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard.caspershouse.com

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.machin AT dot.state.fl.us> wrote in message news:OK**************@TK2MSFTNGP14.phx.gbl...

Hi,

What you can do is get the probables values in an array, then select a
randon from 0 .. array.length - 1

Cheers,

--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????
TIA,
Sebastián

[Sebastián::PJ]

Thank you all!!!
It's been great help!
"WRH" <no**********@videotron.ca> wrote in message
news:Oe*************@TK2MSFTNGP11.phx.gbl...

Hello

Something like this should work..

Random random = new Random();

int [] predef = {15,22,33,6,.....};//eg, 25 predefined mumbers

int index = random.Next(0,25);//get a random index

int num = predef[index];
"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:%2********************@TK2MSFTNGP12.phx.gbl.. .

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be
from
a predefined set of posible values. Is there an "easy" way to do that????
TIA,
Sebastián

[Zach]

"Sebastián" <NO***********@poderjudicial.gub.uy> wrote in message
news:##**************@TK2MSFTNGP12.phx.gbl...

Hi all,
I have to randomlly pick numbers, but not any any number, it has to be from a predefined set of posible values. Is there an "easy" way to do that????

TIA,
Sebastián

If your number selection is from a predetermined set, the selected numbers
are no loger random.
If you want to select them within a range, that is different and doable.

[Jon Skeet [C# MVP]]

Zach <00@00.00> wrote:

If your number selection is from a predetermined set, the selected numbers
are no loger random.
If you want to select them within a range, that is different and doable.

In what way is the predefined set {0, 1, 2, 3, 4} different from
selecting integers in the range [0,4], for example?

Any range of integers is a set. Picking random numbers from a set is
still picking numbers at random.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too

[Sebastián::PJ]

The set was {1,5,10,20,50,100}

"Jon Skeet [C# MVP]" <sk***@pobox.com> wrote in message
news:MP************************@msnews.microsoft.c om...

Zach <00@00.00> wrote:

If your number selection is from a predetermined set, the selected numbers are no loger random.
If you want to select them within a range, that is different and doable.

In what way is the predefined set {0, 1, 2, 3, 4} different from
selecting integers in the range [0,4], for example?

Any range of integers is a set. Picking random numbers from a set is
still picking numbers at random.

--
Jon Skeet - <sk***@pobox.com>
http://www.pobox.com/~skeet
If replying to the group, please do not mail me too