Adds option to display all data on inspect

[paisible-wanderer]

Hello,

By default, using inspect on dataframe/vector/other will not display the whole data.

I have added an option that I think can be useful.

vect = Daru::Vector.new((1..16))

# before
vect
# => #<Daru::Vector(16)>
#    0   1
#    1   2
#    2   3
#    3   4
#    4   5
#    5   6
#    6   7
#    7   8
#    8   9
#    9  10
#   10  11
#   11  12
#   12  13
#   13  14
#   14  15
#  ... ...


# after
puts vect.inspect(all: true);nil
# #<Daru::Vector(16)>
#    0   1
#    1   2
#    2   3
#    3   4
#    4   5
#    5   6
#    6   7
#    7   8
#    8   9
#    9  10
#   10  11
#   11  12
#   12  13
#   13  14
#   14  15
#   15  16
# => nil

Let me know if there is an better way, or any improvement I can make to this PR.

[Shekharrajak]

Thanks for pointing out this. I think we can extend it for displaying the number of columns as well(for dataframe).
So we can have Daru::Formatters::DataFrame module and Daru::Formatters::Vector module where these value will be present globally and can be set using method like :

Daru::DataFrame.inspect_max_rows = 10
Daru::DataFrame.inspect_max_colms = nil
Daru::Vector.inspect_max_rows = nil 

[Shekharrajak]

I think we should have a method that can set the threshold for Daru::DataFrame and Vector to display maximum number of rows and columns.

So I believe we should have a method like

Daru::DataFrame.inspect_max_rows = nil # to load all the rows

Default value will be set to 15.

What do you think ? @paisible-wanderer

[paisible-wanderer]

Hum... It think it could be a good idea.

On the other hand, I don't really see myself using the global options: the default values in daru are already ok; it is just that sometimes I want to inspect/debug and need to check some of the vectors/dfs fully.

[Shekharrajak]

In that case, you can mention the number of rows in the threshold option, itself.

[paisible-wanderer]

You are totally right! Somehow, it did not occur to me (I was just setting threshold to 10_000_000_000).

I still think that the :all option makes (at least semantically) some sens, but I don't think it is that useful.

It think it would be best to simply refuse & close this PR, sorry for the trouble.

[Shekharrajak]

Thanks for update @paisible-wanderer ! It was a nice discussion. I learn, how we can improve formatter module in daru. Surely in future, this will be helpful.

[Shekharrajak]

Closing after this comment : #476 (comment)