title: How to paste a Numpy array to Excel
body: <p>I have multiple files which I process using Numpy and SciPy, but I am required to deliver an Excel file. How can I efficiently copy/paste a huge numpy array to Excel?</p>
  
  <p>I have tried to convert to Pandas' DataFrame object, which has the very usefull function <code>to_clipboard(excel=True)</code>, but I spend most of my time converting the array into a DataFrame.</p>
  
  <p>I cannot simply write the array to a CSV file then open it in excel, because I have to add the array to an existing file; something very hard to achieve with xlrd/xlwt and other Excel tools.</p>