I'm having a problem when using heatmap. Even though the diagonal of my
matrix is all the same value, the diagonal of my heatmap is not all the same
color. Any suggestions?
Here is some reproducible code:
#########################################
# Get data
nba <- read.csv("http://datasets.flowingdata.com/ppg2008.csv";, sep=",")
# Reorder
nba <- nba[order(nba$PTS),]
# Name the rows and then eliminate the 1st row
row.names(nba) <- nba$Name
nba <- nba[,2:20]
# nba2 <- nba[1:10,] ## use these if you only want to look @ 10 players
# Compute how "similar" players are by doing a correlation between their
statistical sets
psim = cor(t(nba))
# psim2 = cor(t(nba2))
# Note: everyone has a self-correlation of 1
diag(abs(psim))
# diag(abs(psim2))
# But the diagonal doesn't always look the same
heatmap(abs(psim))
# heatmap(abs(psim2))
#####################################
Thanks!
-Steven Wolf
Lyman Briggs College
Department of Physics and Astronomy
Michigan State University
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