No, that's not correct. You have one function, not two.
You have INTEGRATED the function over [0, b]. But you are unable to compute values of the same function in three points in the same interval. How is this possible?
all what I need to draw is the values which are on the y-axis
and that is to describe the wave function ψ
the problem now is " what is the function on (0,b)"?
I'm not sure if I can summate the two parts from (0,a) to (a,b) without any other operator such as "integral" ?
actually I think it's not correct two ,, it leads to a complicated formulas !
but that's what I could think about to get one function as what you said ,,, !!!