How I can write a following statement in Matlab?

How I can write following statement in Matlab:

[dpb]

You'll need to write a function using if...elseif...elseif...else...end or you could be creative and write the function using interp1 if wanted a one-liner.

Actually, I was just kicked in the teeth again by the silly restriction of interp1 that only accepts a scalar extrapolation value instead of a two vector for each end...why, TMW hamstrung it such is a pain for such cases. It seems like I figured out a workaround some years ago, but it doesn't strike me at the moment what it was... :( This may just be enough to submit the enhancement request.

[Image Analyst]

Do you want to create a vector of R values? If so, what is the range of x you'd like to evaluate it over?

Or, do you want a function that takes a single input argument, x, and returns a single output argument, a scalar R?