Blog Archives

√(x²−1)(x²−k²).      x,k∈ℂ (actually just going over the unit…

September 15, 2014
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√(x²−1)(x²−k²).      x,k∈ℂ
(actually just going over the unit…

√(x²−1)(x²−k²), k∈ℂ x²√(x²−1)(x²−k²).      x,k∈ℂ (actually just going over the unit circle, not all of ℂ) edit: hey, are these showing up as moving gif’s for you? code: require(animation) source(wegert.R) #where I define "plat" and "Z", standard for...

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Measuring Fat Loss without the scale

July 30, 2014
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Measuring Fat Loss without the scale

@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 not going to look at the scale at all....

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

July 23, 2014
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> plot( polyroot(choose(131,14:29)) ,pch=19,col=’red’)
>…

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')

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Size of each object in R’s workspace

July 22, 2014
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Size of each object in R’s workspace

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 for a bit of context… Here’s an example code to generate objects of variable sizes where you...

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How do I open R help about a symbol or punctuation mark like ( parenthesis or [ bracket?

April 8, 2014
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A question I’ve googled before without success. Hopefully this answer will show up for someone who needs it. I’ll also go over the better-known uses of ? just in case. To get help in R about a function like subset you type ?subset . That’s like man subset from the command line. If you only know roughly what you’re looking for use double...

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How do I open R help about a symbol, special character, or punctuation mark like ( parenthesis or [ bracket?

April 8, 2014
By

A question I’ve googled before without success. Hopefully this answer will show up for someone who needs it. I’ll also go over the better-known uses of ? just in case. To get help in R about a function like subset you type ?subset . That’s like man subset from the command line. If you only know roughly what you’re looking for use double...

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a public list of R freelancers

December 4, 2013
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tl,dr: If you want to be contacted for freelance R work, edit this list https://github.com/isomorphisms/hire-an-r-programmer/blob/gh-pages/README.md.   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 talk to, I don’t know even a small fraction of the R community—let alone people who do R among other...

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a public list of R freelancers

December 4, 2013
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tl,dr: If you want to be contacted for freelance R work, edit this list https://github.com/isomorphisms/hire-an-r-programmer/blob/master/README.md.   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 talk to, I don’t know even a small fraction of the R community—let alone people who do R...

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

October 29, 2013
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Two interesting ideas here:
“trading time”
price impact of a…

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) = "UpDay"names(mer) = "HiLo" mer ...

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

October 29, 2013
By
Two interesting ideas here:
“trading time”
price impact of a…

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) = "UpDay"names(mer) = "HiLo" mer ...

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