Annotation not happening in matplotlib-CodePudding

I have data like this

|               | FA1  | FA2  | FA3  |
|SS Loadings    | 1.6  | 1.3  | 0.58 |
|Proportion Var | 0.27 | 0.20 | 0.10 |

I am trying to graph it up and this is the code I am using

import matplotlib.pyplot as plt

plt.scatter(data.T.index.values, data.T['Proportion Var'])
plt.plot(data.T.index.values, data.T['Proportion Var'])

for i, txt in enumerate(data.T['Proportion Var']):
    ax.annotate(txt, (data.T.index.values[i], data.T['Proportion Var'][i]))

plt.title('Proportional Var')
plt.xlabel('Factors')
plt.ylabel('Variance explained')
plt.grid()
plt.show()

This graph has no annotation. I looked through several questions to see if I am doing something wrong and I have not been able to catch it. Any help is appreciated!

CodePudding user response：

Your variable ax is undefined. You should have seen an error message. If you want to use annotations, you must define it:

fig, ax = plt.subplots()
ax.scatter(data.T.index.values, data.T['Proportion Var'])
ax.plot(data.T.index.values, data.T['Proportion Var'])

for i, txt in enumerate(data.T['Proportion Var']):
    ax.annotate(txt, (data.T.index.values[i], data.T['Proportion Var'][i]))

ax.set_title('Proportional Var')
ax.set_xlabel('Factors')
ax.set_ylabel('Variance explained')
plt.grid()
plt.show()