changing x-axis tick labels using ggplot

Question

I am using ggplot to plot a histogram where the x variable is a categorical variable and I want to change the x-axis tick labels. Here is my code:

from pandas import *
from ggplot import *

df = pandas.read_csv('C:\Users\...csv')

def plot_data(df):

    plot = ggplot(data_by_group, aes('x', 'y')) +
           geom_histogram(stat='bar') + ggtitle('title') + 
           xlab('x-label') + ylab('y-label')  
    #x_ticklabels = ['a', 'b', 'c']    
    return plot

I would like to use the x_ticklabels on the x-axis instead of the numbers from the categorical variable.

Any ideas on how to do this?

Thank you

MeloMCR · Accepted Answer · 2015-07-07 14:43:02Z

4

There is a good example here (under "Setting tick mark labels") showing how to do this. Briefly, given a ggplot "bp", you can control the actual tick labels by setting labels for each category you have in your data like this:

bp + scale_x_discrete(breaks=c("ctrl", "trt1", "trt2"),
                  labels=c("Control", "Treat 1", "Treat 2"))

So in your case, I would imagine you would do something in the lines of

plot = ggplot(data_by_group, aes('x', 'y')) +
       geom_histogram(stat='bar') + ggtitle('title') + 
       xlab('x-label') + ylab('y-label') +
       scale_x_discrete(breaks=c(1, 2, 3),
                  labels=c("a", "b", "c"))

answered Jul 7, 2015 at 14:43

MeloMCR

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2 Comments

jf328 Over a year ago

The question is for Python ggplot, not R ggplot

bmc Over a year ago

You do realize this is a python ggplot question, not R. Your code does not work. Even if you use the standard python syntax (I.e., remove the c() vector notation into list notation) it still doesn't work, so the question stands.

dv_math · Accepted Answer · 2018-07-30 09:39:17Z

1

Change the answer from MeloMCR as below to make it work:

    plot = ggplot(data_by_group, aes('x', 'y')) +
   geom_histogram(stat='bar') + ggtitle('title') + 
   xlab('x-label') + ylab('y-label') +
   scale_x_discrete(breaks=c(1, 2, 3),
              labels=c("a", "b", "c"))

to

    plot = ggplot(data_by_group, aes('x', 'y')) +
   geom_histogram(stat='bar') + ggtitle('title') + 
   xlab('x-label') + ylab('y-label') +
   scale_x_discrete(breaks= [1, 2, 3],
              labels= ["a", "b", "c"])

column specification (c(a1,a2,a3,....) is not identified by python.

answered Jul 30, 2018 at 9:39

dv_math

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