This scr ipt calculates the PSD of a time history. It prompts the user for parameters related to the spectral resolution and the number of statistical-degrees-of-freedom. 这个代码计算一段时间的功率谱密度。

-This scr ipt calculates the PSD of a time history. It prompts the user for parameters related to the spectral resolution and the number of statistical-degrees-of-freedom. This code calculate the power spectral density over time.