John questions

• How to align barplots using grid.arrange?
• R lm versus Python sklearn linear_model
• R: package ggdendro plotting labels disppear
• R ggplot2 click with boxplot
• Convolutional neural network, how the second conv layer works on the first pooling layer
• How to obtain a dynamic threshold for contour detection in OpenCV
• geom_bar + geom_line: with different y-axis scale?
• How to crop a region of small pixels in an image using OpenCv in Python
• R Shiny: How to write loop for observeEvent
• Shiny splitLayout and selectInput issue

John answers