r - Calculate frequencies -


मेरे पास इस तरह एक डेटा फ्रेम है: 

  Expt एक ए ए 2 ए 3 रीप्लिकेट बी 1 बी 2 बी 3 सी 1 सी 2 सी 3 सी 4   
 मैं प्रत्येक प्रयोग के लिए प्रतिकृति की संख्या वापस करना चाहता हूं। इस तरह:  
  Expt #Reps A 3 B 3 C 4   
 यह सुपर आसान हो गया है, लेकिन मैंने कुछ चीजों की कोशिश की है  
  ddply (df, expt, .fun = max (replicate))   
 कोई भाग्य नहीं के साथ कृपया मदद करें।   
 
 
 एक और आसान तरीका:  
  सारांश (df [ , 1]) #where df आपका डेटा फ्रेम है और आप पहले कॉलम की गणना चाहते हैं ("एक्स्प्ट")   
 नोट: पहला कॉलम एक  फ़ैक्टर  है और यह किसी भी कॉलम पर लागू होता है जो कि  फैक्टर     है

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