Creating double boxplots- i.e two boxes for each x-value
Question:
I want to create a boxplot diagram where each x-value has two boxplots right next to each other, kinda like this:
Is this possible? If so, how can I do it?
Answers:
I don’t know if there is a name for this kind of plot but you can create this simply by using the pyplot.boxplot function and passing in the positions keyword to shift the boxes slightly. Here is an example
x = np.array([1000,2000])
data1 = np.array([np.random.normal(loc=0.5,size=100),np.random.normal(loc=1.5,size=100)]).T
data2 = np.array([np.random.normal(loc=2.5,size=100),np.random.normal(loc=0.75,size=100)]).T
plt.figure()
plt.boxplot(data1,0,'',positions=x-100,widths=150)
plt.boxplot(data2,0,'',positions=x+100,widths=150)
plt.xlim(500,2500)
plt.xticks(x)
plt.show()
First we create the two sets of data for the left and right boxes and the corresponding x locations. Next we plot each set of data specifying the position to be x but shifted left and right slightly respectively. Note: Because our x positions are far apart we also have to adjust the widths using the widths keyword. Now we set the correct x-axis limits and then finally replace the x-tick locations with the ones we want.
It produces this output:
thank you for the code, this is exactly what i am looking for. however I have 3 x-values (with 2 boxplots intended for each) and I am reading the y-data from an excel file (1 column per box); i can figure out which part of the code i need to tweak to change it from 2 to 3 x points, and i beleive the biggest issue is the positions that i cannot figure out what to specify. can you please advise?
I want to create a boxplot diagram where each x-value has two boxplots right next to each other, kinda like this:
Is this possible? If so, how can I do it?
I don’t know if there is a name for this kind of plot but you can create this simply by using the pyplot.boxplot function and passing in the positions keyword to shift the boxes slightly. Here is an example
x = np.array([1000,2000])
data1 = np.array([np.random.normal(loc=0.5,size=100),np.random.normal(loc=1.5,size=100)]).T
data2 = np.array([np.random.normal(loc=2.5,size=100),np.random.normal(loc=0.75,size=100)]).T
plt.figure()
plt.boxplot(data1,0,'',positions=x-100,widths=150)
plt.boxplot(data2,0,'',positions=x+100,widths=150)
plt.xlim(500,2500)
plt.xticks(x)
plt.show()
First we create the two sets of data for the left and right boxes and the corresponding x locations. Next we plot each set of data specifying the position to be x but shifted left and right slightly respectively. Note: Because our x positions are far apart we also have to adjust the widths using the widths keyword. Now we set the correct x-axis limits and then finally replace the x-tick locations with the ones we want.
It produces this output:
thank you for the code, this is exactly what i am looking for. however I have 3 x-values (with 2 boxplots intended for each) and I am reading the y-data from an excel file (1 column per box); i can figure out which part of the code i need to tweak to change it from 2 to 3 x points, and i beleive the biggest issue is the positions that i cannot figure out what to specify. can you please advise?