hi dear friends

i want to solve this int with numeric methods such that doesn't contain erf function

thanks alot

(my function is e1, and I want to calculate the int of e1)

Here is yet another finesse (new to me) in getting better performance for some floating-point computation involving the Statistics package.

> restart:

> X:=Statistics:-RandomVariable('Normal'(0,1)):

st:=time():
seq(Statistics:-Quantile(X,1/i,numeric),i=2..10000):
time()-st;[%%][-1];
                                    6.786
                                -3.719016485

> restart:

> X:=Statistics:-Distribution(Normal(0,1)):

Hi everyone, I just created my account in mapleprimes but I regularly find solutions to my problems searching through the posts, however, this time I was not so lucky.

I have the following problem in Maple: I have defined two procedures, A(v::array) and At(v::array) which perform simple algebraic tasks on 2x1 arrays. Then, I redefined the operation `+` when acting on two such arrays using overload. This new definition for addition does not correspond to normal matrix...

With the idea developed by Robert Israel on the

Hi

This is the problem:

deq := (2*.1)*[(y(t)*(diff(y(t), t, t))-1)*(1+(diff(y(t), t))^2)^(3/2)-y(t)*(diff(y(t), t))^2*(diff(y(t), t, t))*sqrt(1+(diff(y(t), t))^2)]-2*sin(t)*(1+(diff(y(t), t))^2)^2 = 0;

dsolve({deq, y(0) = 0, (D(y))(0) = 0}, y(t), numeric)

Error, (in DEtools/convertsys) unable to convert to an explicit first-order system

So Maple signs an error, but I don't know why.

Any help will be appreciated.

How do I split the data up into seperate lists? 

A simple example
a:=[class,23,45,74,34,25,76,class,55,67,78,34,65,12,23,45,64,23,class,12,13,15,class,99,98,97,59, ... ]

So I want to seperate the data out like this
a[1]:=[[2..7]]
a[2]:=[[9..18]]
a[3]:=[[20..22]]
...etc

So I'm not sure how to get maple to skip the word class that seperates the data and store them into seperate lists.

As I have recently learned, the environment variable 'Digits' controls the working precision and is therefore crucial for avoiding significant impacts of round-off error effects on floating point computations.

Moreover I discovered, that even when I set Digits to say 20, Explore is not affected.

Is there a way to control the working precision of the floating-point computations carried out by the Explore option?

Maple carries out the following solving task without any problems:

restart;
with(Statistics):
X1 := RandomVariable(Geometric(q)):
s1:=solve({mu=Mean(X1)},{q});

Anyway, when I add common assumptions (0<q, q<1), then Maple will not carry out the task:

restart;
with(Statistics):
X1 := RandomVariable(Geometric(q)) assuming 0<q, q<1:
s1:=solve({mu=Mean(X1)},{q});

Why is that the case?

I made a program that spits out and alpha and beta at the end of each procedure. What I need to do is assign each alpha and beta a unique name. IE, when it runs the procedure 1, I need it to name them alpha1 and beta1, then for proc2, alpha 2 and beta2. For as many times it needs to run through this process because it may go through proc1 more than once.

It seems I can't find the resource I need, just that one little tidbit in the help files. Any help would be...

dsys := {1/2*diff(theta(t),`$`(t,2))*cos(phi(t))+5/4*diff(theta(t),`$`(t,2))+5/4*diff(phi(t),`$`(t,2))+1/2*sin(phi(t))*diff(theta(t),t)^2, -1/2*mu(t)*sin(phi(t))*diff(theta(t),`$`(t,2))-diff(phi(t),`$`(t,2))+1/2*mu(t)*cos(phi(t))*diff(theta(t),t)^2+5/4*diff(mu(t),`$`(t,2))-150000000000/(1+exp(27.0-15*sin(theta(t))-15*sin(theta(t)+phi(t))))^2*cos(theta(t)+phi(t))*exp(27.0-15*sin(theta(t))-15*sin(theta(t)+phi(t))), (-1-mu(t)*sin(phi(t)))*diff(theta(t),`$`(t,2))-1/2*mu(t...

Hello,

I am new to Maple and I am interested to know what programming language Maple is written in - I mean the maths part of Maple of course and not the interface which appears to be in Java.

Thanks in advance,

Julien.

What is the Problem? Do not use SingularValues (A, output = ['list'])?
Some care in handling this command?

Hello,

I am tying to compute the wronskian of a set of functions. I loaded the LinearAlgebra package and still Maple won't recognize the following command:

wronskian(x, x^2, x^3)

Can anyone please help?

Thanks in advance,

Julien.

Hello,

I am new to Maple and would like to know how to recall the last expression in maple. Say I write "x^2 +2", then press enter and I then want to recall "x^2 +2" without retyping it. How do I do that? (I think I am in math mode using "xmaple".)

Thanks in advance,

Julien.