MATLAB对一组离散的数据进行离散傅立叶变换，得到频谱图，再进行低通滤波，然后再反变换得到离散数据对一组离散的数据进行离散傅立叶变换，得到频谱图，再进行低通滤波，然后再反变换，得到离散数据点，该如何实现？我只知道xjw=fft(x,300);%进行傅里叶变换z=ifft(xjw);%进行傅里叶反变换中间应该如何进行滤波呢？非常感谢！数据如下。能麻烦给一下代码么？谢谢！0.13504980.13504980.13126920.131269200.45394210.45394210.13105560.13105560.46269950.46269950.11781970.11781970.46470730.46470730.11623910.46501350.13544860.12768080.45795060.1253170.10895550.03040.04140.04410.03380.04348110.03550.032600.02880.02560.0270.02890670.02920.02880.46115450.13613213.47222211.848962.5520832.9224542.46527811.848960.46649440.12451240.12143660.46649440.12622120.13932180.09110.12667690.10799430.13465110.099564380.12382890.13408150.11095620.067211650.070629190.098083440.075755510.10685510.071654450.07005960.10218450.10218450.058895630.098083440.11847480.066186390.10582990.055933760.061173990.091704030.11505720.04795950.094096310.052174470.10480460.10491850.10639950.0959190.12200620.11596860.096488590.10776650.076894690.067895160.09215970.058098210.055933760.059123470.055136340.083046260.092501460.10685510.10184270.068578670.096716430.070287440.096716430.0681230.10719690.12212010.10264020.059351310.060148730.0820210.093640640.1028680.077350360.096944270.061401830.1167660.11072830.093982390.11038660.1126650.057300780.087944740.060832240.11152580.10674120.0959190.10252620.07005960.10218450.10822210.11129790.092843210.10264020.098311280.063908030.058895630.099222620.058895630.10377930.10457680.11015880.11198140.10184270.055364170.099564380.10309580.10115920.092615370.10765260.04226360.095349410.090564850.10434890.11482940.06686990.091134440.056845110.11756340.10355150.11574070.045567220.043858450.10332370.066072470.11744950.096032920.063224520.068578670.082704510.099564380.045339380.073591060.10457680.06060440.12189230.050351780.11038660.12519590.06311060.092045780.085324620.062085340.089995260.10651340.097286020.068806510.098083440.0750720.051832710.052857980.095007660.1028680.12781610.46649440.10184270.13704340.11300670.13248670.1070830.12439850.12872740.119044