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SD/2.1_codestyle/index.qmd

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+---
+title: "代码编写规则"
+format:
+  dwsd-revealjs:
+    logo: _extensions/drwater/dwsd/inst/ucaslogo.png
+---
+
+
+## tidy data
+
+```{r}
+knitr::include_graphics("../../image/tidy-1.png", dpi = 270)
+```
+
+
+## pipe（管道） |>
+
+```{r}
+#| eval: false
+require(patchwork)
+plot(1:10)
+1:10 |> plot()
+plot(x = 1:10, y = sin(1:10))
+1:10 |> plot(y = sin(1:10))
+```
+
+```{r}
+#| echo: false
+#| layout-nrow: 1
+#| fig-width: 4
+#| fig-height: 3
+#| out-height: 90%
+require(patchwork)
+plot(1:10)
+1:10 |> plot()
+plot(x = 1:10, y = sin(1:10))
+1:10 |> plot(y = sin(1:10))
+```
+
+
+
+## pipe（管道）：%>%
+
+```{r}
+#| eval: false
+#| layout-nrow: 1
+#| fig-width: 3
+#| fig-height: 4
+#| out-height: 125%
+require(magrittr)
+1:10 %>% plot()
+1:10 %>% plot(y = sin(1:10))
+sin(1:10) %>% plot(1:10, .)
+sin(1:10) |> plot(x = 1:10, y = _)
+```
+
+```{r}
+#| echo: false
+#| layout-nrow: 1
+#| fig-width: 3
+#| fig-height: 4
+#| out-height: 125%
+require(magrittr)
+1:10 %>% plot()
+1:10 %>% plot(y = sin(1:10))
+sin(1:10) %>% plot(1:10, .)
+sin(1:10) |> plot(x = 1:10, y = _)
+```
+
+
+
+
+
+
+## 代码编写规则
+
+```{r}
+#| eval: false
+
+# Strive for:
+short_flights <- flights |> filter(air_time < 60)
+# Avoid:
+SHORTFLIGHTS <- flights |> filter(air_time < 60)
+
+# Strive for
+z <- (a + b)^2 / d
+# Avoid
+z <- (a + b)^2 / d
+
+# Strive for
+mean(x, na.rm = TRUE)
+# Avoid
+mean(x, na.rm = TRUE)
+```
+
+## 练习
+
+```{r}
+#| eval: false
+flights |>
+  filter(dest == "IAH") |>
+  group_by(year, month, day) |>
+  summarize(n = n(), delay = mean(arr_delay, na.rm = TRUE)) |>
+  filter(n > 10)
+```
+
+## 练习
+
+```{r}
+#| eval: false
+flights |>
+  filter(dest == "IAH") |>
+  group_by(year, month, day) |>
+  summarize(n = n(), delay = mean(arr_delay, na.rm = TRUE)) |>
+  filter(n > 10)
+```
+
+## quarto
+
+![](../../image/quarto-flow.png) 
+
+
+## 欢迎讨论！{.center}
+
+
+```{r}
+#| results: 'asis'
+rmdify::slideend(
+  wechat = FALSE,
+  type = "public",
+  tel = FALSE,
+  thislink = "../"
+)
+```
+