Hello every one
can any one tell me how to draw contour with this  data set


  c           z        shock
 1  0.45450237      0
 2  0.02663337      0
 3 -2.08444556      0
 4 -0.12715275      0
 5  0.67066360      0
 6 -0.73540081      0

I want to draw contour for shock i.e my z matrix is shock

when I am applying contour its giving me error : increasing x and y are
expected
when I am applying contourplot its giving me error : no applicable method
for contour plot applied to an object of class "c('double','numeric')"

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