Drawing a function obtained from a partial derivative at a given point

[steven_sani]

Hi,
The following task needed to be solved.

We have a function with two variables, for example

z(x,y)=x * x * y;

We calculate the the partial derivative of z with respect to the variable x, for example at the point x=1. Then we get a function with the y variable which is in our case f(y)=2*y.

How this algorithm can be performed by ROOT to draw f(y)?

Thank you in advance for any help you can provide!
Steven

[Axel]

An example for how to draw functions can be found in ${ROOTSYS}/tutorials/hist/logscales.C - that’s with log scales, but it shows you the pattern!