Hi, I want to use the value of variable to quote elements in matrix.
For example, I have a matrix like:
              y1   y2m1         1      2m2         3      4
where y1,y2,m1,m2 are column and row names.  I have two random character variable, say x,  that could be either  y1 or y2  and  y that could be either m1 or m2.  So can I  do like   Matrix[y,x] to quote elements?  I've tried this way but it simply use "x" and "y" itself  rather its value as column or row names. I want to use the value of x and y as colunm or row names.  So when x="y1" and y="m1" in cases,  I want to matrix[x,y]=1. 
please help.



      
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