Articles by Isomorphismes

Craig Venter’s first chromosome

December 19, 2015 | Isomorphismes

is, I think, the one you can find at curl -O '' #get it #BORING DATA JANITORSHIP tail -n +15 hgp011k.htm __ hgp011k #remove the HTML head stuff .. up to head -n -3 hgp011k | sponge hgp011k #remove the ... [Read more...]

Clay tablet YBC 7289 with an overlay to emphasize the…

September 5, 2015 | Isomorphismes

Clay tablet YBC 7289 with an overlay to emphasize the markings on its surface. The cuneiform inscriptions demonstrate the derivation of the square root of 2 … in sexagesimal (base-60) via Paul Murrell the tablet has been dated to sometime between 1800 BC and 1600 BC. Little is known of its rediscovery, except that it ... [Read more...]

Hacks for thinking about high-dimensional space

June 2, 2015 | Isomorphismes

High-dimensional Euclidean space is ℝ×ℝ×ℝ×ℝ×ℝ×…. Cartesian product of many continuous quantities. You are already familiar with the concept via “an arbitrary number of sliders” or “an arbitrary number of columns in a spreadsheet”. Pivot tables are the normal way business people navigate a low-dimensional subset of a high-dimensional space. One database ...
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Treasury yield curve from the Volcker era through Greenspan,…

November 5, 2014 | Isomorphismes

2006–2014 using FRBData 2006–2014 using FRBData packageTreasury yield curve from the Volcker era through Greenspan, Bernanke, and Yellen. require(YieldCurve) data(FedYieldCurve) maturities I can’t upload a larger view, but just run that code with a bigger width & height, you might get a ~10MB gif. I shrank it further with gifsicle. ... [Read more...]

List of R programmers

September 26, 2014 | Isomorphismes

List of R programmers: Hello R people. In December of 2013 I posted a cheap-o wiki-editable (thank you github) contact list which recruiters can use to find you, if they’re looking for R programmers. In what I consider a resounding success, within a few weeks it got onto the first ... [Read more...]

Measuring Fat Loss without the scale

July 30, 2014 | Isomorphismes

@tdhopper posted his self-measurements of weight loss a few months back. I recently decided also that I wanted to lose fat-weight—the infamous “I could stand to be a few kilos lighter”—and I think I came up with a more productive way of thinking about my progress: I’m ... [Read more...]

> plot( polyroot(choose(131,14:29)) ,pch=19,col=’red’) >…

July 23, 2014 | Isomorphismes

29 39 59 79 99 119 "139"__ plot( polyroot(choose(131,14:29)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:39)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:59)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:79)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:99)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:119)) ,pch=19,col='red') __ plot( polyroot(choose(131,14:139)) ,pch=19,col='red') [Read more...]

Size of each object in R’s workspace

July 22, 2014 | Isomorphismes

I’ve googled How do I find out how big my workspace is too many times … here’s the explicit code to run and hopefully the next googler sees this post: for (thing in ls()) { message(thing); print(object.size(get(thing)), units='auto') } Fin. You can stop there.   Or ...
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a public list of R freelancers

December 4, 2013 | Isomorphismes

tl,dr: If you want to be contacted for freelance R work, edit this list   Background/Problem: I was looking for a list of R-programming freelancers and realised there is no such list. Other than famous people and people I already ... [Read more...]

Two interesting ideas here: “trading time” price impact of a…

October 29, 2013 | Isomorphismes

Two interesting ideas here: "trading time" price impact of a trade proportional to exp( √size ) Code follows: require(quantmod) getSymbols("MER") #Merrill Lynch #Gatheral's model HiLo Op(symbol) #munging mer names(mer)[7] = "UpDay"names(mer)[8] = "HiLo" mer 0) #data cleaning #plot layers require(ggplot2) base 0) losers base + points + line + labels + colour + ... [Read more...]

playing along with Elias Wegert in R: X <-…

October 15, 2013 | Isomorphismes

sine mis-calculated the angles on sine mid-res, small cex, pch=46, sine low-res, small cex, pch=46 z^17th power sine in HCL rather than HSV cosh z+zz+zzz+zzzz+zzzzz+zzzzzz+zzzzzzz+zzzzzzzz+zzzzzzzzz+zzzzzzzzzzplaying along with Elias Wegert in R: X * complex(imaginary=.05) + t(X)/20 #twist & shout X hcl(... [Read more...]

Subtraction Is Crazy

April 4, 2013 | Isomorphismes

I was re-reading Michael Murray’s explanation of cointegration: and marvelling at the calculus. Calculus blows my mind sometimes. Like, hey guess how much we can do with subtraction. — protëa(@isomorphisms) March 28, 2013 Of course it’s not any subtraction. It’s subtracting a function from a shifted version of ... [Read more...]


February 21, 2013 | Isomorphismes

The Cauchy distribution (?dcauchy in R) nails a flashlight over the number line and swings it at a constant speed from 9 o’clock down to 6 o’clock over to 3 o’clock. (Or the other direction, from 3→6→9.) Then counts how much light shone on each number. In other words we want ... [Read more...]

Regressions 101: “Significance”

January 25, 2013 | Isomorphismes

SETUP (CAN BE SKIPPED) We start with data (how was it collected?) and the hope that we can compare them. We also start with a question which is of the form: how much tax increase is associated with how much tax avoidance/tax evasion/country fleeing by the top 1%? how ... [Read more...]
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