title: Using lanczos low pass filter in R program
body: <p>I am wondering if there is any package which allows us to use the Lanczos filter. I found other filters such as butterworth but I am looking for Lanczos low pass filter. </p>
  
  <p>How different is Lanczos filter from butterworth filter ? Any suggestions or hints is appreciated.</p>
  
  <p>Thanks.</p>