Dear ALL
I have this function in R:



func_LN <- function(data){

med_ge <- matrix(c(rep(NA,nrow(data)*ncol(data))), nrow = nrow(data),
ncol=ncol(data), byrow=TRUE)
T <- matrix(c(rep(NA,length(n)*ncol(data))), nrow = length(n),
ncol=ncol(data), byrow=TRUE)
Tdiff<- matrix(c(rep(NA,length(n)*ncol(data))), nrow = length(n),
ncol=ncol(data), byrow=TRUE)
T1<- c(rep(NA,ncol(data)))
T0<- c(rep(NA,ncol(data)))
cov_rank<-matrix(c(rep(NA,ncol(data)*ncol(data))), nrow = ncol(data), ncol
= ncol(data) , byrow=TRUE)

med <- c(rep(NA,ncol(data)))
mean_ge <- c(rep(NA,ncol(data)))
n<-c(NA,2)
  if (ncol(data)>1){
    for(m_j in 1:ncol(data)){
      med[m_j]<-median(data[,m_j])}


    for(m_j in 1:ncol(data))
      for(m_i in 1:nrow(data))
      {
        if(data[m_i,m_j]>med[m_j])
          med_ge[m_i,m_j]=0
        else
          med_ge[m_i,m_j]=1
      }

    y=c(1,1,1,1,1,1,0,0,0,0)


    n<-c(sum(y == 1),sum(y==0))
    touse3 <- y==1

    T1<- apply(med_ge[touse3,], 2, mean)
    T0<- apply(med_ge[!touse3,], 2, mean)


    T=rbind(T1,T0)
    Tbar=colMeans(T)
    Tdiff=T-Tbar
    cov_rank=cov(med_ge)
    inv_cov_rank=ginv(cov_rank)

    LN=0
    for(m_i in 1:length(n)) {
      LN <-  LN+((Tdiff[m_i,]%*%inv_cov_rank)%*%t(Tdiff)[,m_i])*n[m_i]

    }
    return(LN)
  }}

func_LN(data)

Now, I want to try this function on subgroups of data.
So I used "apply"
 result <- apply(gs , 1 , function(z) func_LN(data[which(z==1),]))

but I saw this error:

Error in apply(med_ge[touse3, ], 2, mean) :
  (subscript) logical subscript too long

I will appreciate if you help me.

PS:the elements of gs are 1 0r 0.
dim(data)=24*2665
dim(gs)=107*2665

Soheila

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