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1

salut chers collègues
comment représenter la fonction suivante

grade <- function(x) {if (x>0 & x<1/2) {8*x/3} else if (x>=1/2 & x<1) { 4/3} else {0
}}

2

Hi @mamady_rst

you can try something like this:

x <- c(seq(0, 1, by = 0.01), 1:2)
y <- purrr::map_dbl(x, grade)
ggplot2::ggplot() +
  ggplot2::geom_line(aes(x,y))
3

salut
quand j'exécute la commande
y <- purrr::map_dbl(x, grade), j'ai le message d'erreur suivant:
Error in loadNamespace(name) : aucun package nommé ‘purrr’ n'est trouvé

4

Please use English here, by using French you are excluding most people from the conversation.

That error message is telling you that you don't have the purrr package installed, so if you want to use it, you have to install it first

install.packages("purrr")
5

when I execute the command:
y<- purrr :: map_dbl (x, grade). I get the following error message

Error in loadNamespace(name) : aucun package nommé ‘purrr’ n'est trouvé

6

please how to install purrr

7

With the command I gave you

8

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