title: Contour/imshow plot for irregular X Y Z data
body: <p>I have data in X, Y, Z format where all are 1D arrays, and Z is the amplitude of the measurement at coordinate (X,Y). I'd like to show this data as a contour or 'imshow' plot where the contours/color represent the the value Z (amplitude).</p>
  
  <p>The grid for measurements and X and Y look are irregularly spaced.</p>
  
  <p>Many thanks,</p>
  
  <p>len(X)=100</p>
  
  <p>len(Y)=100</p>
  
  <p>len(Z)=100</p>