r - Tab Delimited to Square Matrix -


I have a tab delimited file like 

  AB 0.5 AC 0.75 BD 0.2

and I want to convert it into a square matrix, such as 

  ABCDA 0 0.5 0.75 0 B 0 0.2 cD  < / Ex> 
 How can I go about this in R? Thank you,

If you have the following column name of data in the data frame: 

 var1 var2 value  

  xtabs (value ~ Var1 + var2, data = df)  <
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