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Tinypliny's Journal

tinypliny
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10/15/2011 10:51 #55304

Diffused Sunlight Simulation
Category: goals
The basic nature of sunlight indoors is that it is never direct most of the times. Almost all sunlight that filters through into rooms is reflected, diffuse and full spectrum (~5500 Kelvin). These three qualities set sunlight apart from artificial light.

The sunlight simulation lamps in the market are mainly high wattage, full spectrum and power consuming lamps. They are targeted at people with SAD - Seasonal Affective Disorders. While I am not convinced I have SAD and need the everyday intensive 1/2 hour to 1 hour therapy that these lamps are regularly recommended for, I am really interested in simulating sunlight at home especially when there is none outside.

I recently went to IKEA and saw this floor lamp, called "Tived".
image
The design is nothing spectacular. In fact, I would call it a bit ugly. But it has flexible arms that can be directed at various parts of the ceiling and walls. It looks like this flexibility could achieve that diffused reflected sunlight feel I want. I almost bought it but it comes with its own set of LED bulbs. I don't like that. I want to be able to readily replace the bulbs if they burn out. The only way to do this would be to get a lamp that holds regular full-spectrum CFLs. None of the more interesting IKEA lamps allow you to put your own bulbs in them.

If it had a few more flexible arms for some more bulbs and it took regular full-spectrum bulbs, it might come close to what I have in mind. IKEA also has a table lamp version of the "Tived" with more arms, but it could be tough to focus the light on the ceiling because of the lack of height. Even if I somehow succeeded in elevating the level of lamp, the bulbs are still the peculiar LED ones. image

I wonder where I can get such a lamp. It would be so cool to have one this winter.

tinypliny - 10/15/11 14:30
IKEA sells Ledare: :::link:::

A range of LED lamps. Maybe I will get one of these lamps after all (if I am sure that the bulbs can be replaced). On their site, they have 3000 and 2700 Kelvin). Both are not full spectrum though. :S
tinypliny - 10/15/11 14:26
More interesting stuff: :::link:::

Maybe LEDs are the way to go. But do they sell full-spectrum LEDs?
tinypliny - 10/15/11 14:17
There is this lamp: :::link::: It might work but it looks uglier. I don't like plastic shades either. They could be a fire hazard.

I like the flexibility of the IKEA lamp better.
tinypliny - 10/15/11 14:02
Glad you brought hydroponics up. Apparently, they use different parts of the spectrum (R, B, G) to achieve optimum rates of growth for various plants, not just the full spectrum sunlight mimicking lights.
tinypliny - 10/15/11 14:00
Yes, it does look somewhat like an abstract art installation. I kind of like it because of that.

Hydroponics is merely growing plants without soil using nutrient solutions: :::link::: I think you can even use cool LED lights of the correct spectrum (~5500K) for growing the plants.
metalpeter - 10/15/11 13:33
I have no idea it looks freaky to me like something from war of the worlds or something..... I wonder about grow lights.... People grow things Hydroponically I wonder if those are supposed to be real sunlight or if they are mostly just heat?

10/15/2011 02:40 #55302

Why go minimal?
Category: the odes
And I thought.

What is the meaning of life? Why are we here anyway? Banal questions and the themes of several works of literary merit (or not). But unanswered nevertheless. Where do we go after this life is over? Heaven and Hell and "the great consciousness" seem rather medieval with all this technology surrounding us. It's hard to believe that anyone even gets punished or rewarded for what they do in life here. That sounds like the words of an atheist. But I am not an atheist. I have a TON of faith. Perhaps not in religion, but in people themselves.

I sincerely believe Science cannot exist without this faith in people, in methods, in what we do, faith in our spirit as humans, faith in a better but unknown future, faith that our work is making things better, faith that we are finding meaning in our lives, faith that we will someday be in a better place and faith that we are making progress.

But in the middle of all this hope, what if some of us give out? Sink into death, into the unknown oblivion? Will anyone care? Yeah, maybe. If you are Steve Jobs, people might even cover the walls of the nearest Apple store with post-its. But what if you are not Steve Jobs? What if you are one of the millions who feel impelled to write one of those post-its? Will someone write post-its for you? How many post-its will you get when you leave this life of yours? Will they be enough to cover a wall? Does it even matter?

The pain you will give people by leaving them behind will matter. How will they cope with this pain? Will it be tough for them to see things you lived with when you were... well alive? Was your life so complicated that along with the pain, you leave them with the tough ordeal of going through the complications and the sheer volume of personal effects you lived with. That each little belonging collects the grief and plunges it back into them as they remember you and then realize that you are now gone?

I am not sure what the point of all these morbid musings are. But I don't want people to suffer after I am gone. I want them to know that I lived happily and tried to do my part. It doesn't matter whether I got anywhere or not. It just matters that I lived most moments happily. I don't want so many belongings that people drown in them and need to hold an estate sale because they don't want any of it. I don't want trivial stuffed toys, knick knacks, I don't want heavily highlighted books and notes with the dried flowers and leaves in them, I don't want anything remotely sentimental and pain-inducing. I don't even want a bed. It does sound pretty clinical and detached but I want to wrap up this life as cleanly as possible, as minimally as possible and when its time to leave, I want leave quietly and completely at ease, and smiling. Because I am not sure I know entirely what the meaning of all this existence is, I just don't think it's worth the drama and pain we bring to people when we let it all go.

And no, I am not sad. I just want to break this chain linux based whingeing that I have been indulging in for the past so many posts with some free-writing on a very non-specific stream of thoughts that just came over and needed written expression.

10/14/2011 22:19 #55298

Gadgety Goodness
Category: i-tech
Woo Hoo!!
image

10/14/2011 18:30 #55297

Fedora missing fonts for Gnumeric?
Category: linux
Why are the row and column numbers displaying as numeric placeholder skeletons in Gnumeric??

image

Does Gnumeric use some proprietary fonts that the mighty forces at Fedora have decided to outcast from the distro??

Aaargh. Can one thing be hitch-free for a change??! Apparently not.
tinypliny - 10/14/11 23:15
Stoke the fires, why don't you.
paul - 10/14/11 23:11
Its yours, mine looks totally normal.

10/14/2011 10:14 #55295

Suse Suse Studio?
Category: linux
Okay, NOW I have tried everything except OpenSuse.

Though Debian has been my favourite in terms of usability and friendliness, there is something really wrong with how Debian systems interact with R and deal with numerical ordering.

For eg. you would expect intervals to be ordered as:
[ 7,11)
[11,12)
[12,13)
[13,14)
[14,29]

Instead Debian orders them as:
[11,12)
[12,13)
[13,14)
[14,29]
[ 7,11)

In a scenario where I have one-digit, two-digit and three-digit numbers, I get the weirdest possible ordering. In the example above, it compares 1 and 7, rather than 11 and 7. This number-by-number evaluation creates serious problems in trend testing and determination of direction of association between variables. It potentially distorts the category that is treated as the reference variable. I looked at R documentation to see if I could change something to make it right. However, after many trials, my windows machine and machines running Fedora were uniformly giving me the right answers while Debian derivatives were giving me the weird answers.

For now, this is a dealbreaker for me and I can't go back to Debian.

That leaves me with
-- CentOS
-- Scientific Linux
-- Fedora
-- OpenSuse

I tried installing CentOS and Scientific Linux on the brawny Toshiba this past weekend but first there were problems with permissions and then problems with the R repository in both CentOS and Scientific Linux. Though Scientific Linux claims to come with R, the DVD I downloaded did not have R! When I tried to install R, there was no R in the default repository. Adding the correct R repository was an unending nightmare that took up 2 hours. I gave up in frustration. Then there was a problem with permissions. CentOS and Scientific Linux don't set up a username to go with the root password in the installation sequence. Even though you might have given a name to your computer during installation, you start up with something like:

yourgivenname@localhost.

instead of

yourgivenname@yourgivencomputername

In addition, it doesn't automatically add you to the sudoers group. I know linux admins won't view this as a problem but end-users like me don't need to work out details about how to add themselves to sudoers, change the localhost name, set up root permissions once more after installation. Its a pain to be burdened with all these nitty grittys even before you start using the system.

CentOS and Scientific Linux are so similar in their installation setup and behaviour, they might as well be clones of each other. The permissions and repositories problem rears its ugly head at every possible software installation. It gets to be very tiring. And what is with the repositories anyway??! They have software from 2 years ago! I understand they are more stable than the newer ones, but come on, newer features that make life easier in the software I use are very important to me!

So no more RHEL derivatives for me.

Which leaves me with Fedora. Sigh. I don't know if I can deal with all the mess that I have been documenting.

So at this point, I am thinking Suse Studio with the software I need from the list below. It could be better than getting OpenSuse and then installing everything because adding software and repositories beforehand might reduce dependency conflicts.
tinypliny - 10/15/11 03:09
What's the point of this sort of ordering??! It so illogical for so many reasons!
paul - 10/15/11 00:21
github is doing the same stupid alpha sort to my numeric tags. :::link::: Why couldn't they just put them in reverse tstamp order, or natural order.
tinypliny - 10/14/11 18:47
Reading your comments, I really don't think I am "linux-ready" yet. LOL I feel like I jumped into a war with no weapons!
paul - 10/14/11 11:18
Not being in the wheel group by default is trivial to resolve using usermod or the GUI aand allowing wheel users to sudo is resolved by uncommenting the line at the bottom of /etc/sudoers where it enables wheel users to sudo.

I think thr idea is if you can't do those basic things in Linux you have no business running a server OS.
paul - 10/14/11 11:13
Open suse =novella=in bed with Microsoft. They used to be my favorite too.

Fedora is better. The issue you are experiencing with scientific Linux and cebtos is that they are really designed to be stable servers not desktops. They are both clones of RHEL. The whole idea of those stable OSes is that you can build and base code on stable versions so that if you were writing something that did a years worth of analysis you don't have to worry about the libraries and APIs changing every week.

Why don't you come by and we can set you up on fedora OR Scientific Linux. There is nothing stopping you from using more current libraries on scientific Linux.

The debian problem cannot be a debian problem but a problem with Rs port on debian.