diff --git a/R/pid_idsa.R b/R/pid_idsa.R
index f224a4eb..795cdc41 100644
--- a/R/pid_idsa.R
+++ b/R/pid_idsa.R
@@ -44,7 +44,7 @@
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' cpsd_disc(y ~ xa + xb + xc,
 #'           data = sim,
 #'           wt = wt)
@@ -183,7 +183,7 @@ cpsd_disc =  \(formula, data, wt, discnum = 3:8, discmethod = "quantile", strate
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' sim1 = dplyr::mutate(sim,dplyr::across(xa:xc,\(.x) sdsfun::discretize_vector(.x,5)))
 #' sz = sdsfun::fuzzyoverlay(y ~ xa + xb + xc, data = sim1)
 #' psd_iev(dplyr::select(sim1,xa:xc),sz,wt)
@@ -214,7 +214,7 @@ psd_iev = \(discdata,spzone,wt){
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' sim1 = dplyr::mutate(sim,dplyr::across(xa:xc,\(.x) sdsfun::discretize_vector(.x,5)))
 #' pid_idsa(y ~ xa + xb + xc, rawdata = sim,
 #'          discdata = sim1, wt = wt)
diff --git a/R/psd_pseudop.R b/R/psd_pseudop.R
index f9283bba..9a3208b0 100644
--- a/R/psd_pseudop.R
+++ b/R/psd_pseudop.R
@@ -23,7 +23,8 @@
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la,power = 2)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')),
+#'                                   power = 2)
 #' psd_pseudop(sim$y,sdsfun::discretize_vector(sim$xa,5),wt)
 #'
 psd_pseudop = \(y,x,wt,cores = 1,
@@ -102,7 +103,7 @@ psd_pseudop = \(y,x,wt,cores = 1,
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' psmd_pseudop(sim$y,sim$xa,wt)
 #'
 psmd_pseudop = \(yobs, xobs, wt, discnum = 3:8,
diff --git a/R/psd_spade.R b/R/psd_spade.R
index 87acc562..31b46d83 100644
--- a/R/psd_spade.R
+++ b/R/psd_spade.R
@@ -20,7 +20,8 @@
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la,power = 2)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')),
+#'                                   power = 2)
 #' psd_spade(sim$y,sdsfun::discretize_vector(sim$xa,5),wt)
 #'
 psd_spade = \(y,x,wt){
@@ -68,7 +69,7 @@ psd_spade = \(y,x,wt){
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' xa = sim$xa
 #' xa_disc = sdsfun::discretize_vector(xa,5)
 #' cpsd_spade(sim$y,xa,xa_disc,wt)
@@ -107,7 +108,7 @@ cpsd_spade = \(yobs,xobs,xdisc,wt){
 #'
 #' @examples
 #' data('sim')
-#' wt = inverse_distance_weight(sim$lo,sim$la)
+#' wt = sdsfun::inverse_distance_swm(sf::st_as_sf(sim,coords = c('lo','la')))
 #' psmd_spade(sim$y,sim$xa,wt)
 #'
 psmd_spade = \(yobs, xobs, wt, discnum = 3:8,
diff --git a/tests/testthat/test-psd_spade.R b/tests/testthat/test-psd_spade.R
index c3815972..050ed9c5 100644
--- a/tests/testthat/test-psd_spade.R
+++ b/tests/testthat/test-psd_spade.R
@@ -1,6 +1,6 @@
 test_that("test whether psd_spade function works well", {
   data('NTDs')
-  wt = inverse_distance_weight(NTDs$X,NTDs$Y,power = 2)
+  wt = sdsfun::inverse_distance_swm(sf::st_as_sf(NTDs,coords = c('X','Y')),power = 2)
   p = round(psd_spade(NTDs$incidence,NTDs$soiltype,wt),6)
   expect_equal(p,0.256653)
 })