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It says at

http://www.maplesoft.com/products/maple/new_features/maple18/Language_Programming.aspx#random

"When generating matrices and vectors of floats and integers, these flavors are very fast. "

But when I compare the new

time[real](Generate(('Matrix')(float, 300, 300)))

and

time[real](RandomMatrix(300, 300))

I find RandomMatrix over 300 times faster. Am I doing something wrong, or is RandomMatrix still the fastest way to generate random numbers?

 

 

I want to generate random numbers following the normal distribution within a fixed interval.

 

For example, I want generate 10 random numbers in the interval [2903.5-5, 2903.5+5]. These random numbers should follow the normal distribution with mean 2903.5 and  standard deviation \sigma=3.

 

How can I do this?

 

Thanks.

My problem is i am working with a very large randomly generated output, generated using maple's builtin in random generating functions. I have the output which i want to investigate but i want to be able to reproduce this result when i save and close the worksheet. Since the list of generators is very long copy pasting is not very nice and i donot know the seed of these generaters. I want to ask if i can store the values in variable in the worksheet so that when i open the worksheet i can get the same random generates stored in the variable.

Hello guys,

 

I think that the title explains the question very well. Is there any function in MAPLE that allows me to generate N random numbers considering a mean value, standard deviation and a percentile?

 

Thank you,

I want to generate a random matrix of size m x n as follows: for each i between 1 and m, take a random p_i number according to some fixed distribution (for example, uniform distribution in [0,10]). These numbers p_i are independent. Then I'll form a random matrix whose (i,j)-entry is chosen according to a probability distribution that depends on the parameter p_i (for example, it could be Poisson(p_i)). So entries in the same row are independent.

How can I do that?

Loading random number ...

February 19 2014 smith_alpha 35

Hi, 

 

  I tried to use generated random as following

*** 

for j from 1 to 5 do
    c:=rand(0..1):
    d:=c();
    print(`random number`,c(),d);

    if c()=1 then

       print(`Y`)
    else
     print(`N`);
    end if;
  end do:

***

 

  The output is

 

****

                      random number, 1, 0

                               Y

                      random number, 1, 1

                               Y

                      random number, 1, 1

                               N

                      random number, 1, 1

                               N

                      random number, 0, 0

                               N

****

  Why the output numbers in one line are different? And Using "if" sentence seems do not correspond to the printed "c()" value..

 

Thank you very much in advance!

 

How to calculate c.d.f from probability mass function. Suppose that the pmf of a discrete random variable is given : f(x)=(2*x+1)/25, x=0,1,2,3,4

I have a set of 19 different items I need randomize, lets call them A-S. I tried the Random command, Random(19,A-S) listing all of the possiblities. I want each letter to be used once in that 19 times and using this way does not do that. Is there another command I can use to achieve this?

Suppose I broadcast a game show where every episode there is 5 randomly chosen topics from 8 possible topics (A,B,C….). how can I get maple to do this automatically?

 I thought I could use

  > with(combinat):

> choose([A,B,C,D,E,F,G,H], 5);

of course the output comes out ordered. is there some way to randomize it? or another way? rgds

If I put in the randomize(#) command with the same actual number each time before generating a sequence of random numbers,  I would expect to get the same sequence of results from repeated use of  

round( Generate(distribution(DiscreteUniform(5,10))) )

each time. Actually, I get completely different sequences of numbers.

This also happens with the alternative method of SetState in RandomTools

This is not only annoying...

I am trying to get Maple to calculate this for me:

Let X1,X2,...X81 be a random sample from a distsribution (not necessarily normal) with mean µ=49 and standard deviation σ =8. Let ¯X = (1/81)* ∑i=181 * Xi

I need to find the mean, the standard deviation and the approximate distribition of ‾X,

 

BTW, the 81 goes directly...

helpw#8.mw

Download helpw#8.mw

THis is what I have so far.. is there anyone who can help me with this?

Let f(x) = 1/9*x^2, o<x<c

Find c so that f(x) is the pdf of a random variable X.

I have come up with this and was wondering if I could get some help. I cant get it to paste in, but I have

uploaded the file.. Please assist if you can.

Twenty five observations of a random variable X are :130.8  129.9  131.5  131.2  129.5  132.2  133.7  127.8  131.5  132.7  134.8 131.7  133.9  129.8  131.4  132.8  132.7  128.8  130.6  131.1  133.8  130.5 131.4  131.3  129.5  //.. How do I construct a stem and leaf display using stems of 127, 128, 129, ... 134? I also need to find all quartiles.. Thank you to anyone...

Hello,

I am trying to get a shaded area in my plot but I could not.

First we solve ODE without randomness:

ode := diff(U(t), t) = -(A+B*U(t))*U(t);

Then we add randomness to ODE and solve:

ode2 := diff(U(t), t) = -(A+r(t)+B*U(t))*U(t);

A with randomness for r in R=( - 0.0001/365, 0.0001/365) is:

A(t,r)= A+r

Where A is constant =  0.0001/365

We plot both solution. For the plot I...

I want to model this game (I want an ensemble average and a time average)

50% chance you get head=win 50%
50% chance you get tails= lose 40%
Starting capital =100

First of all I need a very large binary matrix(1..100000,1..100000) however not
even that I can do fast enough in maple!

I tried:

rtable(1 .. 1000, 1 .. 2000, frandom(0 .. 1, .5), subtype = Array, datatype = float[8], fill = [0, 1])

it is somewhat fast but it does not do what I want ie binary ...

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