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Adding a sigmoidal curve function in raster calculator

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Hello all,

i would like to add a sigmoidal function to create a factor map In Arcmap. The function has to decrease with increase in values.

For example: The suitability should be 1 for a distance of 250m and then it should decrease as a cosine function till 1250m.

250 m has highest suitability value 1 and it decreases to 0 for distances more than 1250m

Could someone explain how to do this using raster calculator? 

Thanks for the help,


Edited by Maya007

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