Points to improve after workshop 20190215 - Githubissues

UtrechtUniversity / workshop-introduction-to-R-and-data

Material for the workshop 'Introduction to R & data'

https://utrechtuniversity.github.io/workshop-introduction-to-R-and-data/

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Points to improve after workshop 20190215 #9

Closed J535D165 closed 5 years ago

J535D165 commented 5 years ago

[x] don't overwrite fc on slide Vectors and Factors
[x] use as.factor instead of factor
[x] generate data.frame with age and names directly. (To fix issue with age)
[x] selecting from data frame more elaborate explanation, including column name as index!

J535D165 commented 5 years ago

The difference between None, NULL and NA.

It's like determining whether there is coffee or tea in cup. None, there is nothing in the cup. NA we didn't know what's in there. NULL, there isn't even a cup (we can't put something in there at all).

bvreede commented 5 years ago

[x] get people to remove the source vectors for their data frame before the exercise, using rm()
[x] there are more ways to get to the resulting names, eg df$name[df$age<30]
[x] vectors/factors: look at this. The sequence is wobbly.
[x] reduce the # of vectors generated...

J535D165 commented 5 years ago

Afternoon:

[ ] tidyverse doesn't load when executing rmarkdown as a cell. Only when you execute the line of code.

bvreede commented 5 years ago

[x] Check the calculation of mag_magnetic. I think there's a double magnetic_y in there.
[x] In the email: sometimes a specific package (J took pic) does not load automatically with tidyverse. This is easily fixed with install.packages, after which tidyverse can be loaded.
[x] In-slide explainer of Rstudio interface! Not just a demo. Use the cheat sheet for this?

bvreede commented 5 years ago

Afternoon:

[ ] tidyverse doesn't load when executing rmarkdown as a cell. Only when you execute the line of code.

Bet you that it's fine.

bvreede commented 5 years ago

The difference between None, NULL and NA.

It's like determining whether there is coffee or tea in cup. None, there is nothing in the cup. NA we didn't know what's in there. NULL, there isn't even a cup (we can't put something in there at all).

Cool idea! But also perhaps a bit confusing, esp since we're using NULL to initialize a variable later on... where is the cup then?

bvreede commented 5 years ago

The difference between None, NULL and NA. It's like determining whether there is coffee or tea in cup. None, there is nothing in the cup. NA we didn't know what's in there. NULL, there isn't even a cup (we can't put something in there at all).

Cool idea! But also perhaps a bit confusing, esp since we're using NULL to initialize a variable later on... where is the cup then?

Can we say that we have specified the concept of a cup? But not generated one yet.

J535D165 commented 5 years ago

Cool idea! But also perhaps a bit confusing, esp since we're using NULL to initialize a variable later on... where is the cup then?

Good point. Let me rethink this.

bvreede commented 5 years ago

[ ] In-slide explainer of Rstudio interface! Not just a demo. Use the cheat sheet for this?

I checked the cheat sheet --- it's super useful, but not for a first meeting of rstudio. I'll make a slide instead.