y = x.map(x => a*x)
f = a => (2*a-4)**2 + (5*a-8)**2 + (9*a-1)**2
fprime = a => 220*a-114
114/220
Purpose-built for displays of data
Observable is your go-to platform for exploring data and creating expressive data visualizations. Use reactive JavaScript notebooks for prototyping and a collaborative canvas for visual data exploration and dashboard creation.
