btain n frequency diagrams.
in each frequency diagram obtained above， the sength of periodicity can be replaced by a grey-scale (or colour) chart.
we perform the replacement， and connect all the grey-scale (or colour) charts into one graph for each integration. the horizontal axis of these new graphs should be the time， i.e. the starting times of each fragment of data (ti， where i= 1，…， n). the vertical axis represents the period (or frequency) of the oscillation of orbital elements.
we have adopted an fft because of its overwhelming speed， since the amount of numerical data to be decomposed into frequency components is terribly hu
对火星轨道变化问题的最后解释(29/49)