implementation of Sigmoid Membership Function

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Maria
Maria 2014-6-11
编辑： Maria 2014-12-13
hi
how to implement sigmoid membership function that takes just one value (singleton) as in picture below :
when i add MF in the matlab and select the MF type as "sigmf" it draws a MF that takes 2 parameters as in the picture below , so how could i implement MF as in the picture above ?
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Maria
Maria 2014-6-12
编辑：Maria 2014-12-13
Many thanks to José-Luis , so the question is , which type of membership function in the picture below and how could i implement this type .
José-Luis
José-Luis 2014-6-12
If one squints the right way, it looks like a series of trapezoidal membership functions.
doc trapmf

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