Empty 'DataFrame': no numeric data to plotの対処について

Empty 'DataFrame': no numeric data to plotの対処について

excelで作成されたデータを、pd.read_excel()にて読み込んでいます。さらにデータを加工・抽出し、グラフを描こうとすると、以下のエラーが出てしまいます。

excelで作成されたデータを、pd.read_excel()にて読み込んでいます。

さらにデータを加工・抽出し、グラフを描こうとすると、以下のエラーが出てしまいます。

TypeError: Empty 'DataFrame': no numeric data to plot

対処方法を、ご教示くださいませ。

import pandas as pd

## xlsファイルの読み込み
df=pd.read_excel('f005-30-027.xls')

#列、行の欠損値の削除、不要な1行目の削除
df=df.dropna(how='all').dropna(how='all',axis=1).drop(1)
df.head()

data visualization

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