ianmcook

# vented box loudspeaker equations

Qts <- 0.40   # property of driver
fs <- 19      # property of driver
Vas <- 260    # property of driver

# you choose an alignment,
# choose a QL (assume 7 for starters),
# then look up the following values
# in the appropriate table on LDC p.58-62:

ianmcook

# closed box loudspeaker equations

Qtc <- 0.707  # you choose this; see LDC p.24
Qts <- 0.40   # property of driver
fs <- 19      # property of driver
Vas <- 260    # property of driver

alpha <- (Qtc/Qts) ^ 2 - 1
  
fc <- (Qtc * fs) / Qts

ianmcook

from pyspark.sql import SparkSession
from pyspark.sql.types import StructType, StructField, IntegerType, StringType, FloatType
from pyspark.sql.functions import col, round

spark = SparkSession.builder.master('local').getOrCreate()

games = spark.createDataFrame(
	[
		(1, 'Monopoly', 'Elizabeth Magie', 1903, 8, 2, 6, 19.99),
		(2, 'Scrabble', 'Alfred Mosher Butts', 1938, 8, 2, 4, 17.99),

ianmcook

# Copyright 2018 Cloudera, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,

ianmcook

devtools::install_github("ianmcook/weatherAlerts")
devtools::install_github("ianmcook/weatherAlertAreas")

library(weatherAlerts)
library(leaflet)

alerts <- getAlerts("FL") # takes about 30 seconds

severity <- alerts@data$severity
colorMap <- c(Minor = "green",

ianmcook

alert('Hello world!');

ianmcook

devtools::install_github("ianmcook/weatherAlerts")
devtools::install_github("ianmcook/weatherAlertAreas")

library(weatherAlerts)
library(leaflet)

alerts <- getAlerts("TX") # takes about 20 seconds

severity <- alerts@data$severity
colorMap <- c(Minor = "green",

ianmcook

# load packages
library(maptools)
library(lubridate)
library(ggplot2)

# vector of all the days in 2017
days <- seq(from = as.POSIXct("2017-01-01"), to = as.POSIXct("2017-12-31"), by = "days")

# coordinates of RDU airport
lon <- -78.788