title: Calculate minimum of overlapping window
body: <p>I am having trouble with thinking of a way to solve a problem. I have a dataframe like the one below:</p>
  
  <p><a href="https://i.stack.imgur.com/pHIZl.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pHIZl.png" alt="enter image description here"></a></p>
  
  <p>These are values for overlapping windows. My challenge is to calculate the minimum value when pooling(?) the windows. It should look like:</p>
  
  <p><a href="https://i.stack.imgur.com/Xo28U.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Xo28U.png" alt="enter image description here"></a></p>
  
  <p>I am a bit lost here on what direction to take, does anyone have any suggestions?</p>