I’ve migrated this site away from WordPress onto Octopress.

Because I can.

You need to be careful with the find command inside a git project.

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I was having trouble saving my last post (back when I was using WordPress), apparently because it contained the following content:

When you paste that into a new post and click preview, it actually shows a preview for the previous post! After returning to the posts list, I’m not even able to edit it again, it triggers a 404. But the content made it to the database OK: I was able to verify it with mysql on the command line.

Various substrings do not trigger the erroneous behavior.

I don’t know what the heck is going on. I tried greping around in the WordPress source code, but wasn’t able to find anything that looked like it was treating that text as a special case.

A friend showed me this puzzling code the other day.

Can you guess the output?

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[22:11:41 mburke]$ php -a
Interactive shell

php > class Test { };
php > $A = new Test();
php > var_dump($A);
object(Test)#1 (0) {
}

php > $B = new $A();
php > var_dump($B);

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$ alias please="sudo"
$ please apachectl restart
$ please make install
$ please rm -rf /

Mind your P’s and Q’s.

HT: Mohsen

HT: @AutomatedTester

Just learned RVM can automatically switch ruby versions based on the current directory.

No more trying to remember which magic rvm use incantation will return your project to a working state.

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I ran into trouble the other day running rspec on my project. It had been working just fine the day before, but all of a sudden:

/Users/mburke/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/i686-darwin12.3.0/digest/sha1.bundle: dlopen(/Users/mburke/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/i686-darwin12.3.0/digest/sha1.bundle, 9): Library not loaded: /opt/local/lib/libcrypto.1.0.0.dylib (LoadError) ..snip ..

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This is part II of a series looking at the physics algorithm for Electric Field Hockey. Part I outlines the initial algorithm and it’s shortcomings.

Last time we noticed a problem in how we generate a time step for our physics simulation: requestAnimationFrame can’t guarantee a consistent interval which makes the simulation appear frustratingly irrational.

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