Sometimes I need to annotate a pdf file, either to take notes or to fill it out as a form since I have ugly handwriting; for the latter, I’m referring to the case where the pdf file does not have form fields you can type in with Adobe Reader. This post describes some programs for annotating pdf files. Xournal is useful when you just want to write on top of a file and print out the content; it converts the content of the original pdf file to an image and saves the old and new contents as a pdf file. I use Xournal on my Asus T101MT touchscreen netbook. Okular seems good except that you can’t save the annotated content and original content as one file or even print the annotated content with the original content.
I just tested Foxit Phantom via Wine and I am able to annotate, save the new pdf file, and print the old+new contents. For form-filling, I recommend printing to pdf as I noticed some glitches with how contents are displayed in the saved pdf files.
I constantly have to review why an inverse relationship exists for bond prices and interest rates. This is a good explanation.
When you want to know what ports/services are opened on your computer, type the following in the command line:
netstat -tunelp | less
This post has a good list of available math software.
Owned my HTC EVO 3D (rooted, stock rom) for almost half a year already and I have not gotten WiFi Tether working until now based on this post. I’m currently using version 3.9 Beta 9. To get tethering to work, I need to enable MSS clamping and Routing fix under Menu > Settings per this post. Yay! I can now tether when I’m away from home.
When I stream podcast files from Google Reader or play mp3 files, I like to be able to work on emails and other tasks. Most default music apps stops the music when another app is accessed. I found doubleTwist after some searching and it allows me to play music in the background. I don’t use it for it’s advertised features, syncing with iTunes.
I currently use AndFTP to download files remotely using the ftp or sftp protocol. For local file access, I use something like ASTRO File Manager or Linda File Manager. I recently discovered EStrong File Explorer, a file manager that lets me access both local and remote files. You can access or stream remote files directly without downloading it first. That is, you can select an mp3 file and play it with your favorite music app directly. It is like the remote server is mounted on the device like in Linux which makes file access feel seamless. Too bad streaming movie files like XviD is a little laggy with MX Video Player or Rockplayer Lite even when the server is on the local network.
This is a great introductory series to object-oriented programming (oop) for Python. There’s also one for Java.
The Washington Post keeps a list here. There is also the UCI Machine Learning Repository.
UPDATE 2012-03-29: Genome data of 1000+ individuals per this post.
I stumpled upon Vladik Rikhter’s post via Hacker News on how to utilize Google Adwords to max out your Dropbox referrals for less than $10. Basically, you set up an ad campaign that leads people to sign up for a Dropbox account via your referral link, giving them 2.25 GB (250 MB extra for using a referral link) of free storage while you benefit 250 MB (or 500 MB if your account is linked to your school email). My initial attempt at this did not yield any clicks, probably because many people were following this method. I waited two weeks and I still didn’t get any referrals; this was probably brought forth by the publicity generated by Lifehacker’s post (see this too). After about 3 months of waiting, I raised my max bid to $0.10/click, and I got 5 referrals in a 24 hour period. I then raised my max bid to $0.20/click and I completed my quota in a day (I’m at 18.3 GB right now with my student email linked to my account). My total cost was $5.34 since I had many referrals prior to using the campaign (was at 9.3 GB). FYI, the default auto bid was around $0.14/click, so this amount should give you enough referrals in a 24 hour period.
Note to self: use Google Adwords when I need people to click on a link (e.g., for referrals).