#' @demoTitle baseball-heatmap
#'
#' Demo heatmaps
#'
#' To install and use baseball demo dataset in Aster:
#'
#' 1. download baseball.zip from
#' https://bitbucket.org/grigory/toaster/downloads/baseball.zip
#' 2. run script to create data set in Aster
#' sh load_baseball_data.sh -d mydbname -U username -w mypassword
#' 3. create Aster ODBC DSN on your desktop
#' see https://bitbucket.org/grigory/toaster/wiki/Home#markdown-header-odbc-driver-and-dns
library(toaster)
library(scales)
## utility input function
readlineDef <- function(prompt, default) {
if (!is.null(prompt))
prompt = paste0(prompt, "[", default, "]: ")
else
prompt = paste0(prompt, ": ")
result = readline(prompt)
if (result == "")
return (default)
else
return (result)
}
## utility connection function
connectWithDSNToAster <- function(dsn=NULL) {
dsn = readlineDef("Enter Aster ODBC DSN: ", dsn)
tryCatch(close(conn), error=function(err) {NULL})
conn = tryCatch({
conn = odbcConnect(dsn)
odbcGetInfo(conn)
return (conn)
}, error=function(err) {
stop(paste("Can't connect to Aster - check DSN '", dsn, "'"))
})
}
## connect to Aster first
conn = connectWithDSNToAster()
## must be connected to baseball dataset
if(!all(isTable(conn, c('pitching_enh', 'batting_enh', 'teams_enh')))) {
stop("Must connect to baseball dataset and tables must exist.")
}
# Heatmap of Average Wins by Franchise and Decade
hmFranchWins = computeHeatmap(conn, "teams_enh", 'franchid', 'decadeid', 'avg(w) w',
where="decadeid >= 1950")
createHeatmap(hmFranchWins, 'decadeid', 'franchid', 'w',
title = "Average Wins by Franchise and Decade")
# Heatmap of Average Diff W-L with diverging color gradient
hmFranchWinLoss = computeHeatmap(conn, "teams_enh", 'franchid', 'decadeid', 'avg(w-l) wl',
where="decadeid >= 1950")
createHeatmap(hmFranchWinLoss, 'decadeid', 'franchid', 'wl', divergingColourGradient = TRUE,
title = "Average Win-Loss by Franchise and Decade")
# BA Heatmaps by Leagues
heatBA = computeHeatmap(conn, 'batting_enh', 'teamid', 'yearid',
aggregates="SUM(BA*AB)/SUM(AB) ba",
where="yearid between 1990 and 2012", by="lgid",
withMelt=FALSE)
createHeatmap(heatBA, 'yearid', 'teamid', 'ba',
title='BA Heatmap AL vs. NL 1990-2012', xlab='Year', ylab='Team',
lowGradient="lightgrey", highGradient="red",
text=TRUE, percent=FALSE, digits=3,
facet='lgid', legendPosition="none")
# ERA Heatmaps by Leagues
pitchERA = computeHeatmap(conn, 'pitching_enh', 'teamid', 'yearid',
aggregates=c("SUM(IPOuts*ERA)/SUM(IPOuts) era"),
where="yearid between 1990 and 2012", by="lgid")
createHeatmap(pitchERA, 'yearid', 'teamid', 'era',
title='ERA Heatmap AL vs. NL 1990-2012', xlab='Year', ylab='Team',
lowGradient="red", highGradient="lightgrey",
text=TRUE, percent=FALSE, digits=3,
facet='lgid', legendPosition="none")
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