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# sigmoid function value for parameter a and b

Asked by Elysi Cochin on 21 Aug 2013

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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Answer by Jan on 21 Aug 2013
Edited by Jan on 21 Aug 2013

According to my calculations you have to pick 0<b<1 and a>0.

E.g. b=1/2 and a=1

Jan on 21 Aug 2013

Laurent was obviously a bit faster than me doing the math, but it's nice to have a result double checked :)

Elysi Cochin on 22 Aug 2013

thank you all

Answer by Laurent on 21 Aug 2013
Edited by Laurent on 21 Aug 2013

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.

## 1 Comment

Elysi Cochin on 21 Aug 2013

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