Running examples in 'ggquiver-Ex.R' failed
The error most likely occurred in:

> ### Name: geom_quiver
> ### Title: Quiver plots for ggplot2
> ### Aliases: geom_quiver GeomQuiver stat_quiver StatQuiver
> ### Keywords: datasets
> 
> ### ** Examples
> 
> library(ggplot2)
> # Quiver plots of mathematical functions
> field <- expand.grid(x=seq(0,pi,pi/12), y=seq(0,pi,pi/12))
> ggplot(field, aes(x=x,y=y,u=cos(x),v=sin(y))) +
+   geom_quiver()
> 
> # Removing automatic scaling
> ggplot(seals, aes(x=long, y=lat, u=delta_long, v=delta_lat)) +
+   geom_quiver(vecsize=NULL) +
+   borders("state")
> 
> ## Don't show: 
> if (requireNamespace("dplyr") && requireNamespace("ggmap")) (if (getRversion() >= "3.4") withAutoprint else force)({ # examplesIf
+ ## End(Don't show)
+ # Centering arrows is useful for plotting on maps.
+ library(dplyr)
+ library(ggmap)
+ wind_data <- wind %>% filter(between(lon, -96, -93) & between(lat, 28.7, 30))
+ qmplot(lon, lat, data=wind_data, extent="panel", geom = "blank", zoom=8, maptype = "toner-lite") +
+   geom_quiver(aes(u=delta_lon, v=delta_lat, colour = spd), center=TRUE)
+ ## Don't show: 
+ }) # examplesIf
Loading required namespace: ggmap
The legacy packages maptools, rgdal, and rgeos, underpinning the sp package,
which was just loaded, were retired in October 2023.
Please refer to R-spatial evolution reports for details, especially
https://r-spatial.org/r/2023/05/15/evolution4.html.
It may be desirable to make the sf package available;
package maintainers should consider adding sf to Suggests:.
> library(dplyr)

Attaching package: 'dplyr'

The following objects are masked from 'package:stats':

    filter, lag

The following objects are masked from 'package:base':

    intersect, setdiff, setequal, union

> library(ggmap)
ℹ Google's Terms of Service: <https://mapsplatform.google.com>
ℹ Please cite ggmap if you use it! Use `citation("ggmap")` for details.
> wind_data <- wind %>% filter(between(lon, -96, -93) & between(lat, 28.7, 
+     30))
> qmplot(lon, lat, data = wind_data, extent = "panel", geom = "blank", zoom = 8, 
+     maptype = "toner-lite") + geom_quiver(aes(u = delta_lon, v = delta_lat, colour = spd), 
+     center = TRUE)
ℹ Map tiles by Stamen Design, under CC BY 3.0. Data by OpenStreetMap, under ODbL.
Error in f(init, x[[i]]) : 
  number of rows of matrices must match (see arg 2)
Calls: <Anonymous> ... get_stamenmap -> stitch -> lapply -> FUN -> Reduce -> f
Execution halted