import numpy as np

def resample(x, t, start, end, step):
    bins = np.arange(start, end+step, step)
    inds = np.digitize(t,bins)
    n = x.shape[0]
    y = np.empty((n, len(bins))) * np.nan
    for i in range(n):
        y[i,inds[i,:]] = x[i,:]
    return y, bins


x = [3,6,9,12,15,18,21,24]
t = [0,4,8,10,45,67,78,90]
x_re, t_re = resample(x, t, 0, 100, 5)