Merge two vectors based on index in R -

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I am trying to merge two vectors of the same length where the vector in NX "a" Align with "b" and vice versa: 

  a < - c (1, na, 3, na) b & lt; - c (NA, 2, NA, 4)   
 should be output:  
  1, 2, 3, 4   
 Thanks for the help!  
 Edit: The solution I used was  
  a is.na (a)]  [b] is [an isna]    
 
 value  a  is.na ( A)  should be replaced with the value of  b , which corresponds to the denial of  is.na (b) . Here I define a new vector  d  so that the original vector should be written on  a  or  b .  
  D & LT; - Ad [is.na (d)] & lt; - b [! Is.na (B)] d # [1] 1 2 3 4   
 If you find that the value of  NA  starts in the second position, you assign Can also be optional.  
  d & lt; - Ad [c (wrong, right)]

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