Avoiding NaN in a piecewise function

Hello everyone,

I have a piecewise function that I am trying to express by means of indicator functions depending on the value of the variable z:

F_Ta = @(z) F_Ta_II(z) .* (z<Rd) + F_Ta_III(z) .* (z>=Rd) 

where F_Ta_III can assume an infinite value only when z<Rd, implying that when F_Ta_III goes to infinity then the second addend becomes NaN and the whole expression consequently is NaN. In such case, instead, I would like the second addend to become zero since only the first indicator is met.

In other words, I would like to give priority to the indicator functions, so that when any indicator is not met then the respective addend is zero anyways.

Thank you in advance for your help :)

Answer 1

[Walter Roberson]

F_Ta = @(z) F_Ta_II(z) .* (z<Rd) + min(realmax, F_Ta_III(z)) .* (z>=Rd)