Use functions without registering

[GitHunter0]

As far as I tested, only numpy functions work without the need of registering, right?

I tried to register the function irr() but I could not make the example below work, what's the right method to do it please?

import pandas as pd
import datar.all as d
from datar.all import f
import pyxirr

df = pd.DataFrame({ 'y': [-2, 1, 1, 1] })
df >> d.mutate(z = pyxirr.irr(f.y))

In the future, will datar be able to use more functions out of the box like in Pandas, in this case df.assign(z = lambda x: pyxirr.irr(x.y))?

Thank you

[pwwang]

f.y is an Expression object, which is used to defer the evaluation of the function/expression. Without registering, the function doesn't know how to handle an Expression object.

[GitHunter0]

Yes, but how can I register the function above? I could not find a way to do it properly.

I tried this for example:

    from pipda import register_func
    import pyxirr
    
    @register_func
    def irr(x):
        return pyxirr.irr(x) 

PS: there are some pages not opening:
https://pwwang.github.io/datar/advanced/
https://pwwang.github.io/datar/reference-maps/datar

[pwwang]

Those links don't exist anymore. You need to refer to the lastest docs:

https://pwwang.github.io/datar/

For registering functions/verbs, you can find instructions here:

https://pwwang.github.io/pipda/functions/
https://pwwang.github.io/pipda/verbs/

In your case:

from pipda import register_func
import pandas as pd
import datar.all as d
from datar.all import f
import pyxirr

irr = register_func(pyxirr.irr)

df = pd.DataFrame({ 'y': [-2, 1, 1, 1] })
df >> d.mutate(z = irr(f.y))

[GitHunter0]

I had also tried that earlier but it didn't work, I found out there was a typo in my code... sorry. Thanks again for the support

[pwwang]

Good to know. A linter is your friend to avoid that.

[GitHunter0]

Good to know. A linter is your friend to avoid that.

Indeed it is my friend.

PS: in https://pwwang.github.io/datar/reference-maps/ALL/ The reference hyperlink of Datar-specific verbs/functions is sending to the broken link https://pwwang.github.io/datar/reference-maps/datar

[pwwang]

It's renamed to other and then misc, since 0.11. The doc needs to be updated.