[RedAmber basic #6] How to create a Vector

[heronshoes]

Vectorを作成するには:

• Vector.new

v1 = RedAmber::Vector.new(1, 2, 3)

This Vector v1 is a key-less or lone Vector. So v1.key is nil.

• From a column in a DataFrame

# pick up the Vector labeled `:key` in the DataFrame `dataframe`
v2 = dataframe[:key]

# This is also OK
v2 = dataframe.v(:key)
# or
v2 = dataframe.key

The last one is only for the key name which is method-able name.
(Can't use for the keys like :Key, :"1key", :"key.1", etc.)

• By a Vector to Vector operation (element wise function)

v3 = v1 / 100.0

Next topic - #7 Change the value in a Vector