Problems with fzero

[Diego Ruiz Moreno]

Hello all,
   I have a BIG problem with fzero
   I have a "strange" function that is y = x-1.09-2.7217*log(1+(x/2.7217));
   When I ask to fzero with a positive initial numbre, let X0= 5, the 
answer is correct, it is 3.2106, but if I give an negative initial point 
(-1) the answer is -1.7701 That is not correct, and more if I call  it 
with -5 tyhe answer is -3.2701, and finally if I call it with -51the 
aswer is correct.
   Could somebody explain to me this behavior ??

   Thanks.

Diego





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