"William Elliot" <email@example.com> wrote in message news:Pine.NEB.firstname.lastname@example.org... > On Wed, 18 Jun 2014, John Smith wrote: > >> The function had many points of inflection but it also had points, which >> I >> presume are also called inflection points, where the gradient was >> infinite >> (i.e tending to a vertical rather than horizontal line on an x,y graph). >> >> I remember the graph looking like a staircase with rounded edges but I >> have >> completely forgotten what the function was. It's possible I have not >> remembered it correctly due to it being so long ago. >> >> Can anyone tell me what this function was or give me a similar function? > > y = -sqr(1 - (1 + x)^2), x in [-1,0] > . = sqr(1 - (1 - x)^2), x in [0,1] > >
Interesting functions but the graphs don't look like what I remember.
It must have been something I could plot myself. And it likely included trigonometric functions but I'm not 100% certain.