This previous equation states that the slope of the new line between (x_a,y_a) and (x,y) is the same as the slope of the line between (x_a,y_a) and (x_b,y_b)
Linear interpolation is quick and easy, but it is not very precise. Another disadvantage is that the interpolant is not differentiable at the point xk.
The following error estimate shows that linear interpolation is not very precise. Denote the function which we want to interpolate by g, and suppose that x lies between xa and xb and that g is twice continuously differentiable. Then the linear interpolation error is
This previous equation states that the slope of the new line between (x_a,y_a) and (x,y) is the same as the slope of the line between (x_a,y_a) and (x_b,y_b) Linear interpolation is quick and easy, but it is not very precise. Another disadvantage is that the interpolant is not differentiable at the point xk.The following error estimate shows that linear interpolation is not very precise. Denote the function which we want to interpolate by g, and suppose that x lies between xa and xb and that g is twice continuously differentiable. Then the linear interpolation error is
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