[英]How to transfer pandas .plot() to Matplotlib .errorbar()
I'm looking to plot error bars on a line plot I did using pandas's .plot()
function我正在寻找 plot 行上的错误栏plot 我确实使用了 pandas 的
.plot()
function
scores_xgb.plot(x='size', y='MSE_mean_tot', kind='line',logx=True,title='XGBoost 5 samples, 5 fold CV')
Running this gives me the following plot:运行它会得到以下 plot:
For plotting the error bars, I choose to use .errorbar()
from Matplotlib. When running the cell为了绘制错误栏,我选择使用
.errorbar()
。运行单元格时
plt.errorbar(x=scores_xgb.size, y=scores_xgb.MSE_mean_tot, yerr=std_xgb ,title='XGBoost 5 samples, 5 fold CV')
plt.show()
I receive the following error message:我收到以下错误消息:
ValueError: 'x' and 'y' must have the same size
This confuses me, as I use the same Dataframe in both examples, each time using the same variable for x
and y
respectively, therefore it has the same size (12) both times.这让我感到困惑,因为我在两个示例中都使用了相同的 Dataframe,每次分别对
x
和y
使用相同的变量,因此它两次都具有相同的大小 (12)。
NB: the yerr = std_xgb
also has size 12.注意:
yerr = std_xgb
的大小也为 12。
There is a property on pandas.DataFrame
objects named size
, and it's a number, equal to the number of cells in the DataFrame (the product of the values in df.shape
). pandas.DataFrame
对象上有一个名为size
的属性,它是一个数字,等于 DataFrame 中的单元格数( df.shape
中值的乘积)。 You're trying to access a column named size
, but pandas chooses the property named size
before it chooses the column name size
.您正在尝试访问名为
size
的列,但 pandas 在选择列名称size
之前选择了名为size
的属性。 Since the single number has a shape of 1 but the columns in the dataframe have a length of 12, you're getting a shape mismatch.由于单个数字的形状为 1,但 dataframe 中的列的长度为 12,因此形状不匹配。
Instead, use strings to index the dataframe and get the the columns:相反,使用字符串索引 dataframe 并获取列:
plt.errorbar(x=scores_xgb['size'], y=scores_xgb['MSE_mean_tot'], yerr=std_xgb, title='XGBoost 5 samples, 5 fold CV')
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