R Under development (unstable) (2024-09-21 r87186 ucrt) -- "Unsuffered Consequences"
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> library(glmm)
Loading required package: trust
Loading required package: mvtnorm
Loading required package: Matrix
Loading required package: parallel
Loading required package: doParallel
Loading required package: foreach
Loading required package: iterators
> set.seed(1234)
> 
>  nrow <- 5
>  ncol <- 3
> 
>  a <- matrix(rnorm(nrow * ncol), nrow = nrow)
>  b <- rnorm(ncol)
> 
>  foo1 <- as.numeric(a %*% b)
> 
>  mout3 <- .C(glmm:::C_matvecmult, a = as.double(a), b = as.double(b),
+      nrow = as.integer(nrow), ncol = as.integer(ncol), result = double(nrow))
>  identical(foo1, mout3$result)
[1] TRUE
>  all.equal(foo1, mout3$result)
[1] TRUE
> 
> a<-matrix(1:8,nrow=2)
> b<-matrix(1:4,nrow=2)
> right<-t(a)%*%b
> 
> stuff<-.C(glmm:::C_matTmatmult,as.double(a),as.double(b),as.integer(2),as.integer(4),as.integer(2),double(8))[[6]]
> stuff2<-matrix(stuff,byrow=F,nrow=4) #at least
> all.equal(right,stuff2)
[1] TRUE
> 
> #make sure the function to add a vector up works
> a<-1:5
> right<-sum(a)
> stuff<-.C(glmm:::C_sumup,as.double(a),as.integer(length(a)),double(1))[[3]]
> all.equal(stuff,right)
[1] TRUE
> 
> #make sure the function to do a-b works
> a<-6:10
> b<-1:5
> right<-a-b
> stuff<-.C(glmm:::C_subvec,as.double(a),as.double(b),length(a),result=double(length(a)))
> all.equal(right,stuff$result)
[1] TRUE
> 
> # make sure matTvecmult works
> a<-matrix(1:8,nrow=2)
> b<-1:2
> right<-t(a)%*%b
> alsoright<-.C(glmm:::C_matvecmult,as.double(t(a)),as.double(b),as.integer(nrow(t(a))),as.integer(ncol(t(a))),double(4))[[5]]
> alsoright<-matrix(alsoright,ncol=1)
> all.equal(right,alsoright)
[1] TRUE
> stuff<-matrix(.C(glmm:::C_matTvecmult,as.double(a),as.double(b),as.integer(nrow(a)),as.integer(ncol(a)),double(4))[[5]],ncol=1)
> all.equal(stuff,right)
[1] TRUE
> 
> 
> 
> proc.time()
   user  system elapsed 
   1.23    0.23    1.45