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# Looking for some curves watch

1. or maybe, 'looking for a curve'

Basically im modelling some situation and I need a curve which is asymptotic to y = 1 as x < ~A and asymptotic to y = 0 as x becomes larger.

Anyone have any ideas?

Obviously its not Ae^(-kx) but I think it would involve exponentials...

Thanks so much

For what its worth ill rep you if you find an equation which works

2. (Original post by 7589200)
...
Does it need to reach 1 as x-->0, or to -infinity? Graph is confusing.

If it's -infinity:
An inverse tan would be a good starting point; a few transformations and it will meet your criteria.
3. (Original post by ghostwalker)
Does it need to reach 1 as x-->0, or to -infinity? Graph is confusing.

If it's -infinity:
An inverse tan would be a good starting point; a few transformations and it will meet your criteria.
Nah it needs to be close to 1, not reach it, as x=0.

so 1 as it heads to minus infinity and 0 as it heads to positive infinity
4. (Original post by 7589200)
Nah it needs to be close to 1, not reach it, as x=0.

so 1 as it heads to minus infinity and 0 as it heads to positive infinity
5. (Original post by Mr M)
With k = 2 that's pretty much exactly what I wanted

thanks very much!

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