ivabrunec

# Create a map of traces using Google Location History #

# get your google maps data:
# https://www.howtogeek.com/725241/how-to-download-your-google-maps-data/

library(dplyr) # data wrangling
library(lubridate) # date parsing
library(ggplot2) # plotting
library(jsonlite) # reading in json file
library(sf) # spatial

echuber2

#!/bin/bash

# Local tester for the PrairieLearn Workspaces version of Rocker. We'd like to
# find out if this truly works on M1 Macs (and why). The macOS version of
# Docker Desktop should handle permissions appropriately here, but this script
# may not work on Windows and Linux. If you are not using macOS, just use
# normal Rocker instead of this script.
# 20220111 Eric Huber

# USAGE INSTRUCTIONS

danjgale

Installing Pysurfer with Python 3.6

Pysurfer can be a bit tough to install because the dependencies (e.g., Mayavi) can be tricky to get right. Further, the documentation, at the time of this writing, states that Pysurfer only works with Python 2.7. This is not entirely the case, as Pysurfer does in fact work with Python 3. Here, I've documented the installation steps to get Pysurfer working with Python 3 on OSX (I'm guessing these steps also hold for Linux; not sure about Windows).

Setup

Before we begin, you'll need conda installed to create a virtual environment, and you will also need Freesurfer installed on your computer (follow the installation steps for your operating system, as is, here).

Then, let's set up our conda environment. We'll want to specify Python 3.6 and install some dependencies:

chrisgorgo

andreyvit

tmux cheat sheet

(C-x means ctrl+x, M-x means alt+x)

Prefix key

The default prefix is C-b. If you (or your muscle memory) prefer C-a, you need to add this to ~/.tmux.conf:

remap prefix to Control + a

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs