Question about ifelse() XXXX

Hi all,

Can anyone explain what is happening with element 4,4 of c1? ifelse()
is not recongizing it as value 1:

c1

q1        q2        q3        q4
q1 1.0000000 0.6668711 0.6948419 0.5758860
q2 0.6668711 1.0000000 0.6040746 0.4917447
q3 0.6948419 0.6040746 1.0000000 0.4730732
q4 0.5758860 0.4917447 0.4730732 1.0000000

ifelse(c1==1,1,0)

q1 q2 q3 q4
q1  1  0  0  0
q2  0  1  0  0
q3  0  0  1  0
q4  0  0  0  0

c1[4,4]

[1] 1