Using text on y-axis instead of numbers for line plot using matplotlib

Question

I am trying to build a line plot with y-axis as text instead of numbers and I have tried this solution but the y-axis still have numbers instead of 'text'. What am I doing wrong. CurrentCoresLE is a list of strings.

Y_AXIS_VALUES = list(numpy.sort(list(set(CurrentCoresLE))))
Y_AXIS = [Y_AXIS_VALUES.index(CurrentCoresLE[i]) for i in range(len(CurrentCoresLE))]
one = axes4.plot(Y_AXIS, color = '0.2', label='CoresUsed')
axes4.set_ylabel('Cores')
#https://stackoverflow.com/questions/17074772/using-text-on-y-axis-in-matplotlib-instead-of-numbers
#plt.yticks(Y_AXIS, Y_AXIS_VALUES)
axes4.set_yticks(Y_AXIS, Y_AXIS_VALUES)
axes4.legend(prop={'size':6}, ncol=4)
axes4.xaxis.grid(True)

And when I try plt instead of axes4, it does give text but in only one spot here is an example: Here is an exmaple Y_AXIS_VALUES and Y_AXIS

['0B2S', '0B3S', '0B4S', '1B3S', '2B0S', '2B2S']
[4, 4, 5, 5, 5, 3, 3, 3, 2, 1, 0, 1, 0, 1, 1, 0, 0, 1, 2, 1, 2, 2, 1, 0, 1, 2, 2, 1, 0, 1, 2, 1, 1, 2, 2, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 3, 3, 3, 2, 1, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 3, 3, 3, 2, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 1, 1]

Can you show your data. Then I can try to help you. This seems not too hard. — Han Zhengzu
– Han Zhengzu, Commented Apr 3, 2016 at 13:19
For now, you can try to use plt.yticks(np.arange(min(Y_value), max(Y_value), len(Your_txt_list))) with ax.set_yticklables(Your_txt_list). I'm not sure this was correct. — Han Zhengzu
– Han Zhengzu, Commented Apr 3, 2016 at 13:24
@HanZhengzu: axes subplot does not use set_yticklables. it only has set_yticks. and set_yticks only accepts floating point values. — tandem
– tandem, Commented Apr 3, 2016 at 13:49

tandem · Accepted Answer · 2016-04-03 14:35:59Z

0

This is how I fixed it.

axes4 = fig.add_subplot(514)
Y_AXIS_VALUES = list(numpy.sort(list(set(CurrentCoresLE))))
Y_AXIS = [Y_AXIS_VALUES.index(CurrentCoresLE[i]) for i in range(len(CurrentCoresLE))]
one = axes4.plot(Y_AXIS, color = '0.2', label='CoresUsed')
axes4.set_ylabel('Cores')
ytickNames = axes4.set_yticklabels(Y_AXIS_VALUES)
fontnum = 10
plt.setp(ytickNames,  fontsize=fontnum)
axes4.legend(prop={'size':6}, ncol=4)
axes4.xaxis.grid(True)

I guess the trick was to set the yticktabels first and use setp

answered Apr 3, 2016 at 14:35

tandem

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