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Chad Scherrer
Computational statistics, parallel algorithms, and functional programming
Computational statistics, parallel algorithms, and functional programming
Chad's posts

I have an M3800 purchased in September. It's really a great machine, but I've been unable to get nvidia-prime or bumblebee working in Ubuntu 14.10. It has a Quadro K1100M, which seem to be the same as the new machines. +Barton George, can you give any details of the driver setup Dell is using on the new developer edition? Thanks!

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Free book on Amazon today about Dev Haskell, private eye. No idea whether the pun is intended. 

+Peter Norvig gave a great keynote this morning at SPLASH, about connections between programming and machine learning. Thanks to +Shriram Krishnamurthi for setting it up!

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This could go wrong in so many ways. 

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3D printing with concrete for large-scale construction - nice!
It has been two years since I first began toying with the idea of a 3D printer that was capable of constructing homes. In my vision of using 3D printers as new technology, I wanted a light, portable, and stable machine. First, I built a small 3D printer that used plastic for its main material, and from that, I started experimenting on enlarging the printer and using variations of cement mixes. Layering cement was an extremely difficult task- it required extensive tuning of the printer on a programming level, as well as using exact quantities for the cement mix. While testing the printer, I ran into obstacles (such as the nightmare of the extruder clogging) and discovered even further abilities of the printer, like that it can print much more than 50cm a day as I originally thought. I was able to calibrate the machine so that it prints nearly perfect layers now, and I played with various heights and widths of the cement layers. My current standard is 10 millimeters in height by 30 millimeters in width, but countless other options are available with just the click of a button.
This two year long journey has led me to build the world’s first 3D Concrete Printed Castle. Finally, it stands!

In desire to start the 3D printing of the castle model sooner, I relied on my own resources. When I started out, people struggled to believe this project would progress any further. However, I was lucky to get lots of invaluable input and support from individuals from the RepRap community. Specifically, I am eternally grateful to James Newton for his constant support with the drivers ( These drivers ended up being the only ones to work properly with Marlin Firmware (I sampled other drivers, which failed), and were powerful enough to move such a huge printer. Also, I am greatly thankful for Mikhail Tikh, a design engineer collaborating with me on the project and responsible for the 3D model of the castle. I’m also really grateful for all the help I received with manual labor on this project.

Right now, I am in the process of redesigning the printer based on the lessons learned. My biggest priority is ensuring that the upgraded printer will be ready for the new project. My goal will be to print 24 hours a day until the project is finished. I’m also planning to print the structure in one piece; printing the castle turrets by themselves was a bad idea as they were extremely difficult to lift and place. Additionally, I’ve figured out how to print a roof; the only thing is that the material I’d print with would have to be used in warmer climates for now.

The next project is a real full-scale livable house. The amount of correspondence I am getting proves high demand and interest in this new technology. I want to make sure that for the next project, I have the right team doing the job to fully use all of the benefits of the 3D printing machine. I am open to offers from individuals or companies interested in owning the first house of this type built with the newest 3D technology and ready to provide abundant funds to completely cover the project and all its expenses. The interested party needs to own the lot/site and possess a permit for a house built by 3D Printing technology. While the location for the next project will be selected based on many factors, I have decided that ideally it should be a region with warm, mild climate so that printing can start in the fall and continue during the winter season. Since the technology is ready, I’d like to start printing as soon as I have a real offer for this first 3D-Printed House. I’d also like to collaborate with the interested architects, designers, and software engineers experienced in 3D tools. Contact me at for any questions, suggestions, and offers.

Finally, our website is live (though still with lots of room for improvement); it will be a place to write updates on the 3D printing progress, as well as be a posting wall for new ideas and findings. I’ve included a page in which I outlined the artistic capabilities of the 3D printer to print design elements; some of the decorative elements worked very well during the castle printing. My hope is that designers and architects looking to create a new look for buildings will find this information useful. The new 3D technology allows us to implement completely new architectural ideas in construction and it is remarkable how we can vary the current architectural structures of homes. With this new technology, it is possible to print limitless amounts of classical décor as well as brand new elements and shapes, whereas previous technology made innovative constructions difficult and expensive.

A new era of architecture is inevitable, and I’m excited to see where the next few years will lead in terms of construction and design. I have previously been sure I could print homes, but having finished the castle, I now have proof that the technology is ready. 

Andrey Rudenko
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My teacher +Steve Smith and his senior student and lineage inheritor +Chris Woiler. Miss training with these guys. 

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Melinae has agreed to open-source my fastbayes +Haskell  package. Just linear regression for now, hopefully more soon. 

From the package description:
General-purpose sampling approaches like Gibbs sampling are very useful for models that have not been studied extensively. But for some cases, specialized algorithms are available because of the model's generality (e.g., linear regression) or niche popularity (e.g., Latent Dirichlet Allocation). This package is an effort to collect such algorithms in one place.

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An eloquent description of our sense of mortality.
The downward spiral

Three days ago my wife Lisa started seeing flashes like lightning in the peripheral vision of her right eye.  Then she started seeing black specks like gnats.  Years ago she nearly had a detached retina, which doctors bolted down with laser surgery.  So she has always been on the lookout for symptoms like this. 

We went to the emergency room around 8 pm, shortly after the black specks formed a 'curtain' in the middle of her field of vision.

In some ways we're all waiting for something like this to happen.  We're all going to die... or at least, most of us: some 'transhumanists' optimistically freeze their brains in hopes that future generations will revive them, but even if this hope comes true, most people can't afford that. 

I've gotten used to the idea of dying, so I'm not going to extraordinary lengths to prevent it.  The harder part is slowly walking down the stairway of old age: getting used to worse and worse health, slower wits, less energy... down to nothing.  It's a journey of renunciation.   Wise old people don't talk about this much, because they know it annoys and (secretly) upsets the young.  It's better to let them live in their happy self-absorbed world: no point in spoiling it.

This must be one reason people like having children and grandchildren: as you falter and fade, they (with luck) are still growing stronger.  The spotlight nicely shifts from you to them... so when death pulls you off the stage with its hook, nobody pays much attention: overall, the show is still a happy one. 

Since I don't have children, I don't know exactly what this feels like.  I tend to use math and physics to create that happy dreamworld where everything keeps getting better and better... though I also have students, who will carry on when I conk out. 

When I switched from pure math and fancy theoretical physics and started thinking hard about global warming, I had to accept the extra emotional burden of facing a world that was not all bright and beautiful.  I think some of my fans left at this point: it turns out they wanted my science explanations to cheer them up!   But I've got a lot of built-in pep and happiness, so I don't need a diet of pure candy.

Anyway, it seems that Lisa had a posterior vitreous detachment, where the vitreous membrane separates from the retina.  It's not a disaster: three quarters of people over 65 get this condition!  Here eye bled a bit when this happened, so she has a bunch of red blood cells floating in her vitreous humor - the big purple 'eyeball' in this picture.  Supposedly in a month these blood cells will go away, decomposed somehow by the magically self-repairing body.

So, it's not so bad.  I know that this is just one more step down that spiral stairway to darkness that Lisa and I are walking, hand in hand.  But that's just how it goes. 

Lisa seems less perturbed by this than me: while I'm writing this little essay, she's packing her suitcases. At 9 tonight she's taking a shuttle to the airport and then flying to Singapore!  I'm going to a conference in Banff for a week, on computation with chemical reaction networks.  Then I'll join her in Singapore, where we will spend the summer working.  

So life goes on.  Until it doesn't.  And even then, it goes on.

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Oh, this could be very nice. 
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