S3
2025-04-23
Last updated: 2025-04-23
Checks: 7 0
Knit directory: muse/
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| File | Version | Author | Date | Message |
|---|---|---|---|---|
| Rmd | f876485 | Dave Tang | 2025-04-23 | Fallback method |
| html | 21e7c91 | Dave Tang | 2025-04-23 | Build site. |
| Rmd | baf65f7 | Dave Tang | 2025-04-23 | Prepend class instead assigning new class |
| html | 16718ba | Dave Tang | 2025-04-23 | Build site. |
| Rmd | 37f24df | Dave Tang | 2025-04-23 | S3 |
S3 is R’s simplest and most flexible object-oriented system. It allows you to create objects that behave differently depending on their class.
Getting started
Create two equivalent data frames but with different column names.
set.seed(1984)
df1 <- data.frame(time = 1:10, value = rnorm(10))
df2 <- data.frame(t = 1:10, val = runif(10))Assign custom classes to each data frame
class(df1) <- c("foo", class(df1))
class(df2) <- c("bar", class(df2))
class(df1)[1] "foo" "data.frame"Define a generic plotting function.
plot_results <- function(x, ...) {
UseMethod("plot_results")
}Method for class foo.
plot_results.foo <- function(x, ...) {
plot(
x$time, x$value,
type = "b",
col = "skyblue",
main = "Plot for foo",
xlab = "Time",
ylab = "Value"
)
}Method for class bar.
plot_results.bar <- function(x, ...) {
plot(
x$t, x$val,
type = "b",
col = "orange",
main = "Plot for bar",
xlab = "Time",
ylab = "Value"
)
}Plot!
par(mfrow = c(1, 2)) # Optional: plot side by side
plot_results(df1)
plot_results(df2)
| Version | Author | Date |
|---|---|---|
| 16718ba | Dave Tang | 2025-04-23 |
Fallback method.
plot_results.default <- function(x, ...) {
stop("No 'plot_results' method for class: ", paste(class(x), collapse = ", "))
}Inspect method dispatch with methods() and
getS3method().
methods(plot_results)[1] plot_results.bar plot_results.default plot_results.foo
see '?methods' for accessing help and source codegetS3method("plot_results", "bar")function (x, ...)
{
plot(x$t, x$val, type = "b", col = "orange", main = "Plot for bar",
xlab = "Time", ylab = "Value")
}Fallback.
set.seed(1984)
df3 <- data.frame(time = 1:10, value = rbinom(n = 10, size = 21, prob = 0.5))
plot_results(df3)Error in plot_results.default(df3): No 'plot_results' method for class: data.frame
sessionInfo()R version 4.4.1 (2024-06-14)
Platform: x86_64-pc-linux-gnu
Running under: Ubuntu 22.04.5 LTS
Matrix products: default
BLAS: /usr/lib/x86_64-linux-gnu/openblas-pthread/libblas.so.3
LAPACK: /usr/lib/x86_64-linux-gnu/openblas-pthread/libopenblasp-r0.3.20.so; LAPACK version 3.10.0
locale:
[1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8
[5] LC_MONETARY=en_US.UTF-8 LC_MESSAGES=en_US.UTF-8
[7] LC_PAPER=en_US.UTF-8 LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C
time zone: Etc/UTC
tzcode source: system (glibc)
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] lubridate_1.9.3 forcats_1.0.0 stringr_1.5.1 dplyr_1.1.4
[5] purrr_1.0.2 readr_2.1.5 tidyr_1.3.1 tibble_3.2.1
[9] ggplot2_3.5.1 tidyverse_2.0.0 workflowr_1.7.1
loaded via a namespace (and not attached):
[1] sass_0.4.9 generics_0.1.3 stringi_1.8.4 hms_1.1.3
[5] digest_0.6.37 magrittr_2.0.3 timechange_0.3.0 evaluate_1.0.1
[9] grid_4.4.1 fastmap_1.2.0 rprojroot_2.0.4 jsonlite_1.8.9
[13] processx_3.8.4 whisker_0.4.1 ps_1.8.1 promises_1.3.2
[17] httr_1.4.7 scales_1.3.0 jquerylib_0.1.4 cli_3.6.3
[21] rlang_1.1.4 munsell_0.5.1 withr_3.0.2 cachem_1.1.0
[25] yaml_2.3.10 tools_4.4.1 tzdb_0.4.0 colorspace_2.1-1
[29] httpuv_1.6.15 vctrs_0.6.5 R6_2.5.1 lifecycle_1.0.4
[33] git2r_0.35.0 fs_1.6.4 pkgconfig_2.0.3 callr_3.7.6
[37] pillar_1.10.1 bslib_0.8.0 later_1.3.2 gtable_0.3.6
[41] glue_1.8.0 Rcpp_1.0.13 highr_0.11 xfun_0.48
[45] tidyselect_1.2.1 rstudioapi_0.17.1 knitr_1.48 htmltools_0.5.8.1
[49] rmarkdown_2.28 compiler_4.4.1 getPass_0.2-4