+ - 0:00:00
Notes for current slide
Notes for next slide

08

Parameters

1 / 12

Parameters in RStudio

1

2 / 12

Knit with Parameters

Screenshot of the knit dropdown menu

Screenshot of the YAML code that then appears in the wizard to select parameters

3 / 12

This uses {shiny} and may be prompted to install for use

Inline Parameters

Report relates to Series `r params$series`

4 / 12

Inline Parameters

Report relates to Series `r params$series`

Screenshot of the rendered html where code is now shown as text "Series 1"

4 / 12

R code Parameters

5 / 12

R code Parameters

series_ratings <- ratings %>% 
  filter(series == params$series)
6 / 12

R code Parameters

series_ratings <- ratings %>% 
  filter(series == params$series)
ratings %>% 
  filter(series == params$series) %>% 
  head(5)
#> # A tibble: 5 x 11
#>   series episode uk_airdate viewers_7day viewers_28day network_rank channels_rank bbc_iplayer_requests episode_count
#>    <dbl>   <dbl> <date>            <dbl>         <dbl>        <dbl>         <dbl>                <dbl>         <dbl>
#> 1      1       1 2010-08-17         2.24             7           NA            NA                   NA             1
#> 2      1       2 2010-08-24         3                3           NA            NA                   NA             2
#> 3      1       3 2010-08-31         3                2           NA            NA                   NA             3
#> 4      1       4 2010-09-07         2.6              4           NA            NA                   NA             4
#> 5      1       5 2010-09-14         3.03             1           NA            NA                   NA             5
#> # ... with 2 more variables: us_season <dbl>, us_airdate <chr>
6 / 12

In chunk settings

---
params:
  show_code: FALSE
---
7 / 12

In chunk settings

---
params:
  show_code: FALSE
---

Also add this to the global options:

knitr::opts_chunk$set(echo = params$show_code)

7 / 12

Shiny Controls

2

8 / 12

Shiny Controls

title: "The Great British Bake Off"
output: html_document
params:
  series: 
    label: "Series numbers"
    value: 1
    input: slider
    min: 1
    max: 9
    step: 1
  • label: text
  • value: starting point
  • input: type of wizard
  • min: minimum that you set
  • max: maximum that you set
  • step: increments (default gives smaller points that don't match data)
9 / 12

The params: YAML code uses {shiny} which needs to be installed.

When searching for options related to types of input consider adding shiny to the search.

Your turn

🧶 Knit button and Knit with Parameters... after each step

  1. Install and add library() call for either wesanderson

  2. Add a new parameter called palette: spaced like series:

  3. Add under the parameter:

label: "Give this a new name?"
value: Darjeeling1
input: select
choices: [GrandBudapest1, Darjeeling1, Darjeeling2, FantasticFox1, Royal2]
  1. Add code to the ggplot2 to change the output colours: + scale_colour_manual(values = wes_palette(params$palette))

psst...01-bakeoff-report-alison.Rmd has all the code...

psst-psst...answer on the next slide...

05:00
10 / 12

Issues may occur with grey pop up from shiny for some computers - possibly VPN/network issues.

Answer

  palette: 
    label: "Wes Anderson palette:"
    value: GrandBudapest1
    input: select
    choices: [GrandBudapest1, Darjeeling1, Darjeeling2, FantasticFox1, Royal2]
11 / 12

Next section...

12 / 12

Parameters in RStudio

1

2 / 12
Paused

Help

Keyboard shortcuts

↑, ←, Pg Up, k Go to previous slide
↓, →, Pg Dn, Space, j Go to next slide
Home Go to first slide
End Go to last slide
Number + Return Go to specific slide
b / m / f Toggle blackout / mirrored / fullscreen mode
c Clone slideshow
p Toggle presenter mode
t Restart the presentation timer
?, h Toggle this help
Esc Back to slideshow