How to avoid a loop here in R? -

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<आर>

मेरे आर प्रोग्राम में मेरे पास निम्न फ़ॉर्म के "for" लूप हैं: 

  (I: i) i ,  a  और  b  लंबाई के वैक्टर हैं  I । 
 
 क्या इस लूप से बचने का कोई सीधा तरीका है और सीधे रिसाव की गणना? यदि हां, तो क्या यह अधिक कुशल होगा? 
 
 धन्यवाद अग्रिम!

यह a * b 

  rev (cumsum (rev (a) * rev (b)) का "रिवर्स cumsum" है

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