f(x)=alog_{c}[b(x-h)]+k

a = 3.8 (slider from -20 to 20, step 0.1)
b = 7 (slider from -20 to 20, step 0.1)
c = 7 (slider from 0 to 20, step 0.1)
h = -8.4 (slider from -20 to 20, step 0.1)
k = -3 (slider from -20 to 20, step 0.1)
f(x) = (a * log(c, (b * (x - h)))) + k
texte1 = LaTeX(f, true, true)
texte3: "asymptote: x = " + (LaTeX[h]) + ""
L_1 = Asymptote(f)
g: x = h