Barplot for degree distribution

Hi:

Firstly, you should have mentioned that you were using the igraph
package; with over 2700 R packages available on CRAN, it's
unreasonable to expect folks to know to which package a particular
function resides, but you may not have been aware of that fact. It
turns out that dd1 is a numeric vector, so you can assign names to the
values which will be passed to barplot(); e.g.,

library(igraph)
g = barabasi.game(500, 0.4)
dd1 = degree.distribution(g)
# by default, produces an index plot
plot(dd1, xlab="degree", ylab = "frequency")

str(dd1)

num [1:19] 0 0.622 0.148 0.078 0.064 0.038 0.02 0.012 0.006 0.002 ...

# Assign labels to the values in dd1:
names(dd1) <- 0:18
barplot(dd1, xlab = "degree", ylab = "frequency", cex.names = 0.8,
            cex.axis = 0.8, xlab = 'Degrees', ylab = 'Relative frequency')

You can replace the values I assigned above with what works for your
application. To see why I lowered the font sizes with cex*, remove
them and you should see gaps between certain numbers on the horizontal
axis. If you need the larger font sizes, look into the staxlab()
function in the plotrix package for an alternative approach to
labeling.

HTH,
Dennis

In barplot for degree distribution x-axis is not seen.

See the example below

g = barabasi.game(500, 0.4)
dd1 = degree.distribution(g)
plot(dd1, xlab="degree", ylab = "frequency")

whereas barplot doesnot have any x-axis

barplot(dd1, xlab = "degree", ylab = "frequency")

Please see the figures attached.
http://r.789695.n4.nabble.com/file/n3476831/barplot_dd__one_.png
http://r.789695.n4.nabble.com/file/n3476831/plot_dd__one_.png


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Thanks for the info.

I have 2 degree distributions that have different degrees.

I want both these barplots to have the same axes. Is this possible?
I have used xlim and ylim. ylim works fine for both plots
But xlim I am not getting the values till 60. And if I give names(dd) <-
0:60 it gives an error.

library(igraph)
names(dd1) <- 0:18
barplot(dd1, cex.names = 0.8, ylim = c(0, 0.3), xlim = c(0, 60)
            cex.axis = 0.8, xlab = 'Degrees', ylab = 'Relative frequency') 

names(dd2) <- 0:50
barplot(dd2, cex.names = 0.8, ylim = c(0, 0.3), xlim = c(0, 60)
            cex.axis = 0.8, xlab = 'Degrees', ylab = 'Relative frequency') 

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Thanks for the info.

I have 2 degree distributions that have different degrees.

Do you mean a different range of values?

I want both these barplots to have the same axes. Is this possible?
I have used xlim and ylim. ylim works fine for both plots
But xlim I am not getting the values till 60. And if I give  
names(dd) <-
0:60 it gives an error.

An error you say? .... WHICH ERROR?

library(igraph)
names(dd1) <- 0:18
barplot(dd1, cex.names = 0.8, ylim = c(0, 0.3), xlim = c(0, 60)
           cex.axis = 0.8, xlab = 'Degrees', ylab = 'Relative  
frequency')

names(dd2) <- 0:50
barplot(dd2, cex.names = 0.8, ylim = c(0, 0.3), xlim = c(0, 60)
           cex.axis = 0.8, xlab = 'Degrees', ylab = 'Relative  
frequency')

Without the data, this will remain a difficult guessing exercise. My  
guess is that you have a column that you think is numeric but is  
really a factor.

David Winsemius, MD
West Hartford, CT