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Friday, August 06, 2010 12:23 PM

F#, the ACM, and the SEC

It all started with a twit from @mulambda: “Phil Wadler lists #fsharp as a candidate for SEC regulation spec language: http://tinyurl.com/2edfxka ” I downloaded the, nonetheless, Association for Computer Machinery answer to the Securities and Exchange...
Posted by Edgar Sánchez | 4 comment(s)
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Thursday, July 29, 2010 5:19 PM

A quick and dirty implementation of Excel NORMINV function in C#

We are piloting the implementation of some financial risk models in F#, it so happens that the models are already implemented in Excel, so I was slowly digging out the formulas in the cells and translating them to F#. Everything was going fine until I...
Posted by Edgar Sánchez | 16 comment(s)
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Monday, October 19, 2009 11:31 AM

Visual Studio 2010 and .NET Framework Beta 2 available on Wednesday

This blog has been abandoned for the longest time :-$ but I’ve got great news to try and re-inaugurate it (again): it’s just been announced that beta 2 for Visual Studio 2010 and .NET Framework 4 will be available the day after tomorrow, i.e. on October...
Posted by Edgar Sánchez | 1 comment(s)
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Sunday, May 18, 2008 1:27 AM

Cloning objects in .NET

In an interesting project where I'm giving a hand, we need to clone objects of a number of different types, perhaps surprisingly the CLR doesn't offer a general cloning method, of course you could use MemberwiseClone() but this is a protected method,...
Posted by Edgar Sánchez | 4 comment(s)
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Tuesday, May 06, 2008 1:40 AM

A cool way to find out whether a number is palindromic

In this blog entry I proposed a solution to Problem 4 at Project Euler , a crucial element of the problem is to find out whether a number is a palindrome (909 is, 809 isn't), a bit out of laziness and a bit in order to reuse existing methods, I decided...
Posted by Edgar Sánchez | 4 comment(s)
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Friday, May 02, 2008 12:09 AM

Which is the ten thousand first prime?

Prime numbers have a good deal of practical applications (for example in cryptography) but let's face it, even if they would have none, they would still be the favorite toy of mathematicians . In Problem 7 of Project Euler , we are asked to find the 10001st...
Posted by Edgar Sánchez | 7 comment(s)
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Sunday, April 27, 2008 9:56 PM

The square of the sum vs. the sum of the squares

The sixth Project Euler problem poses an exercise that, to me, offers no major hurdles: What is the difference between the sum of the squares and the square of the sums [of a sequence of natural numbers]? The functional C# solution is fairly easy to write...
Posted by Edgar Sánchez | 10 comment(s)
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Thursday, April 24, 2008 1:22 AM

Recursive lambdas and sequence aggregations

The fifth problem at Project Euler proposes this nostalgic primary school exercise: find the smallest quantity that is evenly divisible by some numbers, the least common multiple of 1, 2, 3, ..., 20 to be precise. To begin with, let's remember the old...
Posted by Edgar Sánchez | 8 comment(s)
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Tuesday, April 22, 2008 2:41 AM

Nested sequences and palindrome numbers

Problem 4 of Project Euler poses and impractical albeit intriguing problem: given all three digit numbers (100, 101, 102, ..., 998, 999), find the largest product of 2 of those numbers, where the product is a palindrome . For example, 580.085 is the product...
Posted by Edgar Sánchez | 7 comment(s)
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Tuesday, May 08, 2007 11:25 PM

Oracle 10g for Windows Vista released

Oracle has just released a version of its database server specific for Windows Vista, you can download Oracle Database 10g Release 2 (10.2.0.3) Enterprise/Standard Edition for Microsoft Windows Vista (slightly long name). Now, if what you want is to ...
Posted by Edgar Sánchez | 12 comment(s)
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