Interpolating a string

In some cases, you might need to interpolate numbers embedded in a string; perhaps a CSS style for font.

In this recipe, we will examine how you can do that using D3 scale and interpolation. However, before we jump right into string interpolation, a bit of background research on interpolator is due and the following section will cover what interpolation is and how D3 implements interpolator functions.

Interpolator

In the first three recipes, we have gone over three different D3 scale implementations, now it is time to delve a little deeper into D3 scales. You are probably already asking the question, "How different scale knows what value to use for different inputs?" In fact this question can be generalized to:

We are given the values of a function f(x) at different points x0, x1, … ,xn. We want to find approximate values of the function f(x) for "new" x's that lie between these points . This process is called interpolation.

Kreyszig E & Kreyszig H & Norminton...