[Rd] Fw: Calling a LAPACK subroutine from R

Giovanni Petris
Wed, 11 Sep 2019 13:47:11 -0000

Sorry for cross-posting, but I realized my question might be more appropriate
for r-devel...

Thank you,
Giovanni

________________________________________
From: R-help <r-help-bounces at r-project.org> on behalf of Giovanni
Petris <gpetris at uark.edu>
Sent: Tuesday, September 10, 2019 16:44
To: r-help at r-project.org
Subject: [R] Calling a LAPACK subroutine from R

Hello R-helpers!

I am trying to call a LAPACK subroutine directly from my R code using
.Fortran(), but R cannot find the symbol name. How can I register/load the
appropriate library?

> ### AR(1) Precision matrix
> n <- 4L
> phi <- 0.64
> AB <- matrix(0, 2, n)
> AB[1, ] <- c(1, rep(1 + phi^2, n-2), 1)
> AB[2, -n] <- -phi
> round(AB, 3)
      [,1]  [,2]  [,3] [,4]
[1,]  1.00  1.41  1.41    1
[2,] -0.64 -0.64 -0.64    0
>
> ### Cholesky factor
> AB.ch <- .Fortran("dpbtrf", UPLO = 'L', N =
as.integer(n),
+                  KD = 1L, AB = AB, LDAB = 2L, INFO = as.integer(0))$AB
Error in .Fortran("dpbtrf", UPLO = "L", N = as.integer(n),
KD = 1L, AB = AB,  :
  Fortran symbol name "dpbtrf" not in load
table
> sessionInfo()
R version 3.6.0 (2019-04-26)
Platform: x86_64-apple-darwin18.5.0 (64-bit)
Running under: macOS Mojave 10.14.6

Matrix products: default
BLAS/LAPACK: /usr/local/Cellar/openblas/0.3.6_1/lib/libopenblasp-r0.3.6.dylib

locale:
[1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

loaded via a namespace (and not attached):
[1] compiler_3.6.0 tools_3.6.0

Thank you in advance for your help!

Best,
Giovanni Petris



--
Giovanni Petris, PhD
Professor
Director of Statistics
Department of Mathematical Sciences
University of Arkansas - Fayetteville, AR 72701


______________________________________________
R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Dhelp&d=DwICAg&c=7ypwAowFJ8v-mw8AB-SdSueVQgSDL4HiiSaLK01W8HA&r=C3DNvy_azplKSvJKgvsgjA&m=C-MwKl__0xz-98RBbu7QNXJjqWkRr4xp6c0cz9Dck7A&s=a1vAu3mcXKObTLwP19vOmRPq55h6oQTh_vnS6BEibF0&ePLEASE
do read the posting guide
https://urldefense.proofpoint.com/v2/url?u=http-3A__www.R-2Dproject.org_posting-2Dguide.html&d=DwICAg&c=7ypwAowFJ8v-mw8AB-SdSueVQgSDL4HiiSaLK01W8HA&r=C3DNvy_azplKSvJKgvsgjA&m=C-MwKl__0xz-98RBbu7QNXJjqWkRr4xp6c0cz9Dck7A&s=qFGlplF9cOSmnDUvugsPRDn4iZS7v-LuWNAvfY69sbA&eand
provide commented, minimal, self-contained, reproducible code.