You could construct your curve from segments of straight lines . . .
Mine, (see below chart), makes use of polynomial equations form - quadratics, logs, etc. I cant think of other eqns for forex, beyond this.
not sure is this what you wanted when you say specific..."exept that it must be curved according to a specific equation"
can you explain more...thx.

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Good day,
I would like to create a curved trend line indicator. It must work like a normal trend line, exept that it must be curved according to a specific equation. It however does not seem possible to do, unless I am mistaken. Any suggestions in this regards will be much appreciated.
Best regards