r - Problems with "complete.obs" in correlation -


i've got problem cor() function in r, here's data df:

    b             c          d       e 1   0 0.00000000    17.0       16.90   5.039439 2   0 0.00000000    20.5       18.35   4.974208 3   0 0.00000000    25.0       25.00   2.158227 4   0 0.00000000    19.1       19.05   4.317257 5   0 0.00000000    21.0       20.90   3.853504 6   0 0.00000000    20.0       19.15   5.408093 7   0 0.00000000    17.4       17.40   5.375745 8   1 0.08053691      na          na         na 9   0 0.00000000    18.0       18.00   2.767346

when try calculate:

cor(df$a,df$c,use="complete.obs")

i error: 

standard deviation 0

but have absolutely no clue why it's not working, becuase acutally row #8 should excluded because of na, shouldn't it?

thank you!


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