SDOF System solution with recurrence interpolation

SDOF problems from "Dynamics of Structures, A.K. Chopra (2020)" solved numerically (interpolation) and analytically.

Interpolation with recurrence formula per Dynamics of Structures: Theory and Applications to Earthquake Engineering

SYNTAX: [u,ud] = icrf(U0,P,SD,T)

U0 = [INITIAL POSITION, INITIAL VELOCITY] = [U0,UD0]

P = [TIME STEPS, APPLIED LOAD AT TIME STEP] = [TP, P]

SD = [MASS, STIFFNESS, DAMPING COEFFICIENT] = [M, K, XI]

T = [SOLUTION START TIME, TIME STEP, TERMINATION TIME] = [TS, DT, TR]

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