nutella is currently certified at Master level.

Name: Scrambled Text?
Member since: 2005-01-14 23:43:36
Last Login: 2015-07-24 02:39:49

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This bit didn't come back when I recreated my account after the Advogato glitch.

I am a Yoorpean currently working for a medium-small biotech company in the San Francisco Bay area. After getting my Ph.D. in Yoorp I was a fellow at the National Cancer Institute, a postdoc at UCSF and an investigator at a health science company in the Chicago area. I don't know where life will lead me next.

I am not a computer professional but have been hooked on them since exposure to the school's Commodore PET (1979). I prefer UNIX-like OSs and have used Linux in some shape or form since Slackware 2.0 in June 1994 (kernel 1.0.9). In addition to Intel boxes at home and work I also have a Sun Ultra 5. All run Debian.

Recent blog entries by nutella

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Curiouser and curiouser...
The video embedded by Elleo in their April 21st post, instead of terminating the Recent Blog Entries prematurely like most cases, causes it to skip to the last entry on the current Recent list (joey's April 1st post). The perennial unterminated Bold tag still holds sway from louie's March 29th post and continues through the right-hand sidebar.
Well that makes a change
Everything centred is a little better than everything in bold.

It seems that youngsters a third of my age seem to be able to memorise this and type it in without thinking, but I need this put somewhere my lazy neurons can find it.
vlc -vvv "input.flv" --no-sout-video --play-and-exit --sout="#transcode{acodec=mp3,ab=320,channels=2}:std{access=file,mux=raw,dst="output.mp3}"

...and don't forget to double-check that VLC has write permission for the target directory (it is very cautious). Yes yes yes, should be Linux, should be ogg etc. etc. but sometimes my hands are tied.

I am glad to see that Pedro is also having fun with R. There are, however, times when it drives me crazy. For example, carrying out simple linear regression, then using the result to predict a value. Note that in the code below I have replaced my preferred assignment operator (less_than + hyphen) with Pascal's := because Advogato doesn't like stray angle brackets, so rewrite it if you want to run the code;
# Let's create some x and y values
xlist := c(1:5);
ylist := c(0.9, 2.1, 3.2, 4.3, 5.1);
# Now simple linear regression
regobject := lm(ylist ~ xlist, data=data.frame(cbind(xlist, ylist)));

If I look at the contents of regobject then all is well. However, now for the prediction. In a sane world this should be as simple as;
predict(regobject, newdata=testvalue);

Where testvalue has the x-value to be used in the prediction. Unfortunately R fails worse than silently as it just provides the predicted values for everything in xlist. Okay, maybe I need to coerce the value into a data frame.
predict(regobject, newdata=data.frame(testvalue));

Nope. It needs a data frame with a column with the same name as that used to generate the regression object. I have not seen that written explicitly in any book or help file. Thankfully a few other folk have ranted about this so there are explanations out there.
predict(regobject, newdata=data.frame(xlist=testvalue));

Woohoo! So now,
predict(regobject, newdata=data.frame(xlist=2.5));

gives me the predicted y-value for x=2.5 (y=2.59). My guess is that being an R programmer is now so lucrative that documentation is written in an obscure (but factually correct) manner deliberately. Prepare for this blog entry to receive a takedown notice :-)

Pedro, I was just reading the same thing. I have to admit I've never run Linux on my 80386/33 (now confined to my mother's attic) but started with Slackware and a 1.0 kernel on my 486 (which now runs a bastard combination of Slackware and RHL5.2/Apollo - on the rare occasions I switch it on). It did seem a little sad to lose one architecture, but then I read the details and could see how big a gap there was between the capabilities of the 386 and 486.

...and talking of Linux on odd platforms, my Ultra 5 lives again, and now with Debian squeeze. Getting the NVRAM back to a working state involved a big oops on my part, that required me to do a [STOP]-[N] to clear everything and start over. I also tried to use the serial console for the first time and got nowhere, but then I RTFM and found that the 25-pin port has priority and the 9-pin port doesn't wake up until the system gets further along in the boot process. With that in mind I'll dig out my old Laplink cable sometime and see if I can get the console to work.

261 older entries...


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