I want to buy a camera, and wonder what equipments are the beautiful pictures on 500px made with.
First I’d like to state that I’m not really a fan of signs(astrology). I just hear people talking about it. This post is done just for fun, do not take it as serious.
This post is originally posted at Wechat in Chinese, and I’m not planning to translate it here. But you can read the images. Still I’ve translated the only import part, that is, do not take seriously, relax, read and forget.
Python is not known as a very fast language, but you have some options to speed up your programs.
上周末参加了R会议广州会场，干货没有期待的那么多，尤其是感兴趣的量化方面。有感于一些内容，这里也分享一下自己对量化的工具集的看法。
I’m switching to R recently, and one of the challenges is to get the right package from the mass world. Rstudio provides CRAN download logs from 2012-10-01, which contain all hits to http://cran.rstudio.com/ related to packages.
I am reading Chen’s Algorithmic Trading and plan to rewrite the strategies in Python. This is the first post of this series. I’ll put the core code here. For the result and comparison with the original Matlab code please refer to my ipython notebook here.
Algorithmic Trading with Python
I found a Python package for quant trading called zipline, which is currently used in production as the backtesting engine powering Quantopian.
Suppose x is a continuous variable, we want to convert it to categorical. For example, we want to assign 1 to top 30%, 2 to middle 40%, and 3 to last 30%.
About Renv
Renv lets you be able to install multiple R versions and choose which to use globally or per-project.
