Add docs to test compatibility with other classes for #13

Former-commit-id: 48654b1

data-raw/si-classes.Rmd

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+---
+title: "Using the si package with different input classes"
+output: github_document
+---
+
+```{r, include = FALSE}
+knitr::opts_chunk$set(
+  collapse = TRUE,
+  comment = "#>"
+)
+```
+
+```{r setup}
+# remotes::install_github("robinlovelace/si")
+library(si)
+# ?si_predict
+```
+
+```{r}
+od = si_to_od(si_zones, si_zones, max_dist = 4000)
+m = lm(od$origin_all ~ od$origin_bicycle)
+od_updated = si_predict(od, m)
+class(od_updated)
+od_dt = data.table::data.table(od)
+class(od_dt)
+od_updated_dt = si_predict(od_dt, m)
+class(od_updated_dt)
+identical(od_updated$interaction, od_updated_dt$interaction)
+```
+

data-raw/si-classes.md

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+Using the si package with different input classes
+================
+
+``` r
+# remotes::install_github("robinlovelace/si")
+library(si)
+# ?si_predict
+```
+
+``` r
+od = si_to_od(si_zones, si_zones, max_dist = 4000)
+#> 1695 OD pairs remaining after removing those with a distance greater than 4000 meters:
+#> 15% of all possible OD pairs
+m = lm(od$origin_all ~ od$origin_bicycle)
+od_updated = si_predict(od, m)
+class(od_updated)
+#> [1] "sf"         "data.frame"
+od_dt = data.table::data.table(od)
+class(od_dt)
+#> [1] "data.table" "data.frame"
+od_updated_dt = si_predict(od_dt, m)
+class(od_updated_dt)
+#> [1] "data.table" "data.frame"
+identical(od_updated$interaction, od_updated_dt$interaction)
+#> [1] TRUE
+```