Thoughts

Posted on October 29, 2006

Concordia should register bunch of domains like comp442.com

(and install subversion somewhere!)

Benchmarks

Posted on October 28, 2006

Maybe you should try this with SELinux disabled again. Solaris doesn’t have the Trusted Extensions (mandatory access control) enabled by default where fedora has SELinux (mandatory access control) enabled by default.

The massive amounts of added security mandatory access control come at a 5-8% performance cost.

What hardware guys gave, software guys took away.

fsck it

Posted on October 27, 2006

Do I really have to hate coming to class?
Do I really want to listen to ignorant teacher?
Do I have to write test that with mambo-jambo even teacher can’t explain and have almost nothing course related?
Do I have to learn nothing?
Do I want to play Russian-roulette on the final?

No I don’t.

So I dropped that class.

Firefox 2.0 Tabs

Posted on October 25, 2006

How to restore some of Firefox 1.5 tab defaults and remove “list all tabs” drop-down:

create:

C:\Documents and Settings\Iouri Goussev\Application Data\Mozilla\Firefox\Profiles\
8beksjhu.default\chrome\userChrome.css

add:

/* Disable “List all Tabs” Button */
.tabs-alltabs-button {
display: none !important;
}

/* Disable Container box for “List all Tabs” Button */
.tabs-alltabs-stack {
display: none !important;
}

.tabs-alltabs-box, .tabs-alltabs-box-animate {
display: none;
}

open about:config and change

browser.tabs.closeButtons = 3
browser.tabs.tabClipWidth = 10
browser.tabs.tabMinWidth = 10

browser.urlbar.hideGoButton = true

P.S BTW FF 2.0 shows all saved password in plaintext.
P.P.S List of plugins I use:

Addblock Filterset.G Updater
Adblock Plus
BugMeNot (great!)
Colouful Tabs (stoped working in 2.0)
del.icio.us
DOM Inspector
Fire Bug
GreaseMonkey
Ie Tab
JavaScript Debugger
SessionSaver (Read life saver!)
Tamper Data
View Dependencies

Masters of Comp Sci #2

Posted on October 19, 2006

You can use your COMP 451 class assignment as a thesis!

Masters of Computer Science

Posted on October 19, 2006

Read it online - you will enjoy every sentence.

Email Everywhere
Course Manager
Employee self service
A web based student course register system using JSP technology
Design and implementation of a Java H.263/G.726 decoder
The design and analysis of algorithms for sort and merge using comparisons
A comparison of two programming languages Java and C#

In my humble opinion

Posted on October 14, 2006

On type safety

Posted on October 13, 2006

True type safety is an illusion. Without type safety, however, are your programs destined to a buggy doom? Not really. Type safety is definitely good for eliminating a basic class of bugs, but the problem is that program errors are often more subtle than confusing an integer for a string. Type safety is like a broad contract; it can guarantee general conditions (that a field is a string, or an object is of a particular transaction type), but not specific uses. Unfortunately, correct programs often require more specific constraintsfor example, it is not enough that a customer ID is typed as an integer; it must be an integer in a particular range that validates against internal checksums that go beyond what can be expressed with mere types. In other words, static types can never replace full-fledged testing, but too many programmers act like it does. Compiling is not testing; testing is testing. Bugs happen in both statically typed and dynamically typed programs, and the best defense is unit testing or some other more-rigorous testing approach. Because it is not compiled and has no static types, ABCDEF might seem to be more dangerous to develop in; but in some sense, it can actually be safer to program in: Because developers have no illusions that type checking is a serious defense against bugs, they will not confuse compilation with correctness.

How would I know if in unit test I test the same type I have in a program?

If type safety is definitely good for eliminating a basic class of bugs, why remove it entirelly?

It is true that correct programs require more specific constraints that default data types provide, why then custom type specifically designed to enforce thouse constrains would not be sufficient?

ABCDEF might seem to be more dangerous to develop in. Is it or is it not?

Does it mean that in unit-tests I have to check if every computation puts result in valid co-domain?

Haskell Wisdom

Posted on October 9, 2006

Elendal: Hi, i am doing an assignment in haskell and I want to know if I can avoid calling same code twise can anybody help?

getOfSame [] _ = []
getOfSame hand x = if (length (filter (\x -> getRank x == (getRank(getHighCard hand))) hand) == x)
                    then filter (\x -> getRank x == (getRank(getHighCard hand))) hand
                    else getOfSame (removeHightCard hand) x

emk: Elendal: Let me take a look.
Pseudonym: Elendal, time to learn about where clauses.
Pseudonym: Oh, and guards.
emk: Elendal: A where clause, a let declaration, or a helper function.

Pseudonym:

foo x y = if c then e else t

Pseudonym: Can be refactored as:

foo x y
 | c   -> e
 | otherwise -> t

Pseudonym: The other thing is you can give expressions a name:
Pseudonym: foo x y = … someExpression … someExpression
Pseudonym: transform to:
Pseudonym: foo x y = … e … e
Pseudonym: where e = someExpression

dons: something like:

getOfSame hand x
      | length r == x = r
      | otherwise = getOfSame (removeHightCard hand) x
      where f c = getRank c == getRank (getHighCard hand)
            r   = filter f hand

dons: Elendal: the key is to use ‘where’ to record the result of the filter once, and then just reuse that result
Elendal: Thanks!
emk: Elendal: Good luck!
Pseudonym: BTW, bonus marks for the nice accumulator recursion.

Posted on October 8, 2006

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