R语言显示量度数目不对

> data<-man_death_rate> break_year<-2015> T<-break_year-1997+1> n<-2018-break_year> D_all<-matrix(rep(0,19*22),19,22)> E_all<-matrix(rep(0,19*22),19,22)> m_all<-matrix(rep(0,19*22),19,22)> lnm_all<-matrix(rep(0,19*22),19,22)> for (t in 1:22) {+   for (x in 1:19) {+        D_all[x,t]<-data[x+19*(t-1),3];E_all[x,t]<-data[x+19*(t-1),4]+        m_all[x,t]<-D_all[x,t]/E_all[x,t];lnm_all[x,t]<-log(m_all[x,t])+   }+ }Error in D_all[x, t] : 量度数目不对为什么出现这样的情况呢？