成都市蟑螂密度的小波分析

Wavelet analysis with Matlab for cockroach density in Chengdu City

目的对9年内成都国家病媒监测点室内蟑螂密度数据的时间序列进行小波分析,以得出该地区蟑螂密度的变化特征。方法使用Matlab 8.3软件小波分析工具,将2007-2015年报告的成都分月蟑螂密度按照城区和郊区分别使用Morlet复小波函数进行连续小波变换,并计算小波系数。结果成都蟑螂密度具有18个月时间尺度的主振荡周期。小波系数为城区:-2.147 3+3.213 1i^3.385 2+2.764 0i;郊区:-4.491 0+0.457 6i^24.879 6-9.808 2i。结论小波分析可用于蟑螂密度变动研究。

Objective To analyze the time series of indoor cockroach density by wavelet analysis on Chengdu national vector monitoring site of nine years,and get variation trend. Methods Urban and suburban ’s monthly density data were continuous transformed by Morlet complex wavelet during 2007-2015 respectively as well as to calculate coefficients. Results An 18 month main oscillation periodicity was found from the cockroach density of Chengdu. urban’s wavelet coefficients was-2. 147 3 ＋ 3. 213 1i-13. 385 2 ＋ 2. 764 0i; suburban ’s wavelet coefficients was-4. 491 0 ＋ 0. 457 6i - 24. 879 6-9. 808 2i. Conclusion The wavelet analysis can be used for cockroach study.