Generally speaking, you can first group the data according to equal spacing, statistics for each set of intervals in the number of data (the actual number of times), so that the composition of the distribution, and then the Poisson distribution to calculate each set of intervals occurring in the theoretical (calculated using poisspdf) number of times, the final calculation of the actual number of times and the theoretical number of times of the chi-square value, which obeys the chi-square distribution (chi2pdf), you can be a test of significance. The latter follows a chi-square distribution (chi2pdf), which can be used for significance testing.