title: How to switch to a map that is centered on the China instead of the default set in R ？
body: <p>I have been using R to plot a world map and I want to switch to a map that is centered on the Pacific ocean and splits the Atlantic to make my data plot easier.</p>
  
  <p>But the default set of R is like this:</p>
  
  <pre><code> map("world") 
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/H1buz.png" alt="R default set"></p>
  
  <p>And I want the map to be like this:</p>
  
  <p><img src="https://i.stack.imgur.com/LrF9X.jpg" alt="world map wanted"></p>
  
  <p>I have tried the help of R worldmap the option "orientation" Even though the help says that "
  orientation
  a vector c(latitude, longitude, rotation) describing where the map should be centered and a clockwise rotation (in degrees) about this center.
  "
  I still could not use it for example like the following command only produce this:</p>
  
  <pre><code> map("world",orientation=c(35,104,0)) 
  
   Warning：
   In map("world", orientation = c(35, 104, 0)) :
   projection failed for some data
  </code></pre>
  
  <p>the result is like this:</p>
  
  <p><img src="https://i.stack.imgur.com/nN2Y2.png" alt="The R plotting odd map"></p>
  
  <p>The result is strange. So how can I get something right like Picture 2 have shown? Thank you.</p>