Skip to main content

apply a function to each level of grouping factor and create new column in existing data frame

I have a data frame (df) that looks like this

           timestamp                  datetime        date      time    open  \
0      1667520000000 2022-11-04 00:00:00+00:00  2022-11-04  00:00:00  0.2186   
1      1667606400000 2022-11-05 00:00:00+00:00  2022-11-05  00:00:00  0.2589   
2      1667692800000 2022-11-06 00:00:00+00:00  2022-11-06  00:00:00  0.2459   
3      1667779200000 2022-11-07 00:00:00+00:00  2022-11-07  00:00:00  0.2315   
4      1667865600000 2022-11-08 00:00:00+00:00  2022-11-08  00:00:00  0.2353   
              ...                       ...         ...       ...     ...   
15012  1675728000000 2023-02-07 00:00:00+00:00  2023-02-07  00:00:00  0.2449   
15013  1675814400000 2023-02-08 00:00:00+00:00  2023-02-08  00:00:00  0.2610   
15014  1675900800000 2023-02-09 00:00:00+00:00  2023-02-09  00:00:00  0.2555   
15015  1675987200000 2023-02-10 00:00:00+00:00  2023-02-10  00:00:00  0.2288   
15016  1676073600000 2023-02-11 00:00:00+00:00  2023-02-11  00:00:00  0.2317   
         high     low   close        volume              symbol  
0      0.2695  0.2165  0.2588  1.239168e+09  1000LUNC/USDT:USDT  
1      0.2788  0.2414  0.2458  1.147000e+09  1000LUNC/USDT:USDT  
2      0.2554  0.2292  0.2315  5.137089e+08  1000LUNC/USDT:USDT  
3      0.2398  0.2263  0.2352  4.754763e+08  1000LUNC/USDT:USDT  
4      0.2404  0.1320  0.1895  1.618936e+09  1000LUNC/USDT:USDT  
       ...     ...     ...           ...                 ...  
15012  0.2627  0.2433  0.2611  8.097549e+07       ZRX/USDT:USDT  
15013  0.2618  0.2432  0.2554  7.009100e+07       ZRX/USDT:USDT  
15014  0.2651  0.2209  0.2287  1.217487e+08       ZRX/USDT:USDT  
15015  0.2361  0.2279  0.2317  6.072029e+07       ZRX/USDT:USDT  
15016  0.2418  0.2300  0.2409  2.178281e+07       ZRX/USDT:USDT

I want to apply a function from pandas ta, called bbands to each level of symbol using the column 'close' as the input. The function return multiple variables, but I only want to keep the one labeled 'BBM_20_2.0' and store this as another column in the df.

If I were to just apply the function to entire df ignoring the fact that each symbols has to be treated separately I would do this

daily_df['bbm'] = bbands(daily_df.close, 20, 2)['BBM_20_2.0']

I have tied to use groupby like this

daily_df['bbm'] = daily_df.groupby(["symbol"]).apply(bbands(daily_df.close, 20, 2)['BBM_20_2.0'])

but Im getting errors. Can anyone help?



source https://stackoverflow.com/questions/75421579/apply-a-function-to-each-level-of-grouping-factor-and-create-new-column-in-exist
Labels:

Comments

Post a Comment

Popular posts from this blog

Confusion between commands.Bot and discord.Client | Which one should I use?

Whenever you look at YouTube tutorials or code from this website there is a real variation. Some developers use client = discord.Client(intents=intents) while the others use bot = commands.Bot(command_prefix="something", intents=intents) . Now I know slightly about the difference but I get errors from different places from my code when I use either of them and its confusing. Especially since there has a few changes over the years in discord.py it is hard to find the real difference. I tried sticking to discord.Client then I found that there are more features in commands.Bot . Then I found errors when using commands.Bot . An example of this is: When I try to use commands.Bot client = commands.Bot(command_prefix=">",intents=intents) async def load(): for filename in os.listdir("./Cogs"): if filename.endswith(".py"): client.load_extension(f"Cogs.{filename[:-3]}") The above doesnt giveany response from my Cogs ...
Post a Comment
Read more

How to show number of registered users in Laravel based on usertype?

i'm trying to display data from the database in the admin dashboard i used this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count(); echo $users; ?> and i have successfully get the correct data from the database but what if i want to display a specific data for example in this user table there is "usertype" that specify if the user is normal user or admin i want to user the same code above but to display a specific usertype i tried this: <?php use Illuminate\Support\Facades\DB; $users = DB::table('users')->count()->WHERE usertype =admin; echo $users; ?> but it didn't work, what am i doing wrong? source https://stackoverflow.com/questions/68199726/how-to-show-number-of-registered-users-in-laravel-based-on-usertype
Post a Comment
Read more

Where and how is this Laravel kernel constructor called? [closed]

Where and how is this Laravel kernel constructor called? public fucntion __construct(Application $app, $Router $roouter) { } I have read the documentation and some online tutorial but I can find any clear explanation. I am learning Laravel and I am wondering where does this kernel constructor receives its arguments from. "POSTMOTERM" CLARIFICATION: Here is more clarity.I have checked the boostrap/app.php and it is only used for boostrapping the interfaces into the container class. What is not clear to me is where and how the Kernel class is instatiated and the arguments passed to the object calling the constructor.Something similar to; obj = new kernel(arg1,arg2) or, is the framework using some magic functions somewhere? Special gratitude to those who burn their eyeballs and brain cells on this trivia before it goes into a full blown menopause alias "MARKED AS DUPLICATE". To some of the itchy-finger keyboard warriors, a.k.a The mods,because I believe in th...
Post a Comment
Read more