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...[,3] [,4] [1,] 1 3 5 7 [2,] 2 4 6 8 > ccov(a) Error in solve.default(cov, ...) : Lapack routine dgesv: system is exactly singular I also tried colume bind, but it still doesn't work. > a1<- a[,1] > a2 <- a[,2] > a3<- a[,3] > a4 <- a[,4] > acomb <- cbind(a1,a2,a3,a4) > acomb a1 a2 a3 a4 [1,] 1 3 5 7 [2,] 2 4 6 8 > ccov(acomb) Error in solve.default(cov, ...) : Lapack routine dgesv: system is exactly singular Yesterday, I used cov(), my function worked well. But today I ran the same code, it returned an error like:...

...*xdim , ] = c(x[i,], y[j, ])} } v1 = data.frame(v1) # set output as dataframe } This works fine when combining sec1 and sec2, comb = multiperm(sec1,sec2) However when I try to reapply the function to combine the joint combinations of sec1 and sec2 along with sec3 comb= data.frame(comb) acomb = multiperm(comb,sec3) an "Error: incorrect number of subscripts on matrix" error occurs. Can anyone explain why this is the case and how I can resolve it? Many thanks Mark Abrahams We provide assessment products and services that enable organisations to recruit, retain and d...