[FIXED] Add std value to line plot (using yerr parameter) raise an error: AttributeError: 'Line2D' object has no property 'yerr'

Issue

I have data frame which has data about mean value of different group and their std, similar to this:

index   timestamp    mean1   std1   mean2  std2  mean3   std3
0       2022/11/01   0.542   0.07   0.729  0.21   0.375   0.08
1       2022/11/02   0.623   0.05   0.811  0.04   0.211   0.11
...

I want to plot the three means per day and to display the std. For that I have seen that I can use the plot function of matplotlib, and to add the variable "yerr" and to put the name of the std columns. However, I keetp getting this error:

'Line2D' object has no property 'yerr'

I have used this script:

from matplotlib.lines import Line2D 

ax=plt.figure(figsize=(15,8))
plt.plot(df.iloc[:,1],color='tab:blue',yerr='std1',linestyle='-',linewidth=1.8)
plt.plot(df.iloc[:,3],color='black',yerr='std2',linestyle='-',linewidth=1.8)
plt.plot(df.iloc[:,5],color='tab:red',,yerr='std3',linestyle='-',linewidth=1.8)
plt.xticks(fontsize=16, rotation=90)
plt.yticks(fontsize=16)

how can I fix it and display the error on top of the lines? the script works when I don't add the yerr parameter.

Solution

You are using 'plt.plot()' to try and include the error bars, yet the linked function is 'plt.errorbar()'. I think that 'plt.plot()' does not have the optional argument 'yerr' and that's the reason for the error. I suggest substituting your 'plt.plot()' by 'plt.errorbar()' and it should work:)

Answered By - Oski