What are some simple (or elegant) functions that satisfy these conditions?

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I wish to have a function that maps [0,1] to [0,1]. I also require that f(0) = 0 and f(1) = 1.

Also, I would like the function to be of sigmoidal shape, such as this:

enter image description here

The above function is ok, but I would like the function to be flatter at the bottom and the top, and have a steeper ascent.

Ideally I would be able to adjust the parameters of the function to control how "flat" it is.

Optional: If I could also adjust the parameters so that I can choose where the inflection occurs that would be great. (e.g. in the above function the inflection seems to occur at x = 0.5, but ideally I would be able to shift this to say x = 0.1, or x = 0.05 etc.)