Hello

I would like to model a logarithmic growth with a strong growth at the beginning.

Scale of X: 0 3 years
Scale of Y: 10 000 to 5 000 000

Model:
- X --> 0 to 6 months: Y --> 10 000 to 1 000 000
- X --> 6 months to 1 year: Y --> from 1 000 000 to 3 000 000
- X --> 1 year --> 3 years: Y --> 3 000 000 to 5 000 000

I though to set up a function like this one: x+1 = a * Ln(x/b) + x
But I cannot manage to find the right one.

Any idea?

Cheers