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Square Root %:  0 0 0 Root

%: y is the square root of y . If y is negative, the result is an imaginary number. For example, %:-4 0j2 .
 
  x %: y is the x root of y . Thus, 3%:8 is 2, and 2%:y is %:y . In general, x %: y y^%x .
 

For example:
   y=: i. 7
   y
0 1 2 3 4 5 6

   2 %: y
0 1 1.41421 1.73205 2 2.23607 2.44949

   %: y
0 1 1.41421 1.73205 2 2.23607 2.44949

   r=: 1 2 3 4
   z=: r %:/ y
   z
0 1       2       3       4       5       6
0 1 1.41421 1.73205       2 2.23607 2.44949
0 1 1.25992 1.44225  1.5874 1.70998 1.81712
0 1 1.18921 1.31607 1.41421 1.49535 1.56508
          
   r ^~ z                     See agreement in Section II B, and note use of ~
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6
0 1 2 3 4 5 6



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