I was wondering how I can get the equation for Probability Density Function (PDF) for a variable x which follows

a normal distribution with mean 0 and stdev 10 but also has a stop at -10 (ie all x's that are more negative

than -10 becomes -10). I can plot such a function with the below code but I dont know

how to extract the equation for the PDF...humm

I am trying to build a portfolio optimization model from simulated data. I start by defining the very large

correlation matrix and then I apply Cholesky decomp to get the cross correlated simulated data. However

I systematically get the warning message:  Warning, Matrix is not positive-definite. It is extremely difficult

(if possible at all) to specify a large correlation matrix that is positive-definite.

Can anyone give me a good example of MultiThreading in Maple  with(Threads):

I looked in the help files but I could not find anything good. The example should include a loop

which is running in the background while the user is doing other things simultaneously in Maple.

The loops could be using a time delay to slow it down

st := time[real](); while time[real]()-st < 5 do  end do ;

The output from each iteration should be displayed in a math container so we can see that it is working.

MATLAB has this Index extracting symbol function for yahoo finance (which works well in MATLAB)
 

I had a look at the Maple application "An Interactive Stock Quote Importer"  www.maplesoft.com/applications/view.aspx

which is quite nice :-)  I did not really understand how the author (Samir Khan Maplesoft ) managed to download

yahoo finance data directly inside Maple so I sent him an email asking. He sent me some quite nice code (which I

simply put in a procedure ) that downloads data for any specified ticker symbol from yahoo finance: