sigmoid function value for parameter a and b

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Elysi Cochin
Elysi Cochin 2013-8-21
Please can someone help me with sigmoid function. Please can anyone tell me what values i should give for a and b so that i get for
y0=sigmf(0,[a b]) % y0 value less than 0.5
and for
y1=sigmf(1,[a b]) % y1 value greater than 0.5

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Jan
Jan 2013-8-21
编辑：Jan 2013-8-21
According to my calculations you have to pick 0<b<1 and a>0.
E.g. b=1/2 and a=1
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Jan
Jan 2013-8-21
Laurent was obviously a bit faster than me doing the math, but it's nice to have a result double checked :)

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Laurent
Laurent 2013-8-21
编辑：Laurent 2013-8-21
Well, if the only requirement is that y0 < 0.5 for x=0 and y1 > 0.5 for x=1, then for 0 < b < 1 and a > 0 it should work.
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Elysi Cochin
Elysi Cochin 2013-8-21
sir for x = 0, it should be a value less than 0.5 and for x = 1, it should be a value greater than 0.5
such a value i need for a and b

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