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Extracting specific columns from a data frame
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Using the dplyr package, if your data.frame is called df1:
library(dplyr)
df1 %>%
select(A, B, E)
This can also be written without the %>% pipe as:
select(df1, A, B, E)
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How can I get query string values in JavaScript?
...date: Sep-2018
You can use URLSearchParams which is simple and has decent (but not complete) browser support.
const urlParams = new URLSearchParams(window.location.search);
const myParam = urlParams.get('myParam');
PS
Unfortunately URLSearchParams don't properly parse query strings with string keye...
In PHP, what is a closure and why does it use the “use” identifier?
.... This is not evil at all and in fact it is quite powerful and useful.
Basically what this means is that you are allowing the anonymous function to "capture" local variables (in this case, $tax and a reference to $total) outside of it scope and preserve their values (or in the case of $total the...
Lodash - difference between .extend() / .assign() and .merge()
In the Lodash library, can someone provide a better explanation of merge and extend / assign .
5 Answers
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Compare two dates with JavaScript
...ter than, less than, and not in the past using JavaScript? The values will be coming from text boxes.
38 Answers
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pandas dataframe columns scaling with sklearn
...e of the columns. Ideally, I'd like to do these transformations in place, but haven't figured out a way to do that yet. I've written the following code that works:
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Constructing pandas DataFrame from values in variables gives “ValueError: If using all scalar values
This may be a simple question, but I can not figure out how to do this. Lets say that I have two variables as follows.
17 A...
Does Python have a ternary conditional operator?
If Python does not have a ternary conditional operator, is it possible to simulate one using other language constructs?
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get list from pandas dataframe column
...import pandas as pd
data_dict = {'one': pd.Series([1, 2, 3], index=['a', 'b', 'c']),
'two': pd.Series([1, 2, 3, 4], index=['a', 'b', 'c', 'd'])}
df = pd.DataFrame(data_dict)
print(f"DataFrame:\n{df}\n")
print(f"column types:\n{df.dtypes}")
col_one_list = df['one'].tolist()
col_one_...
Pandas index column title or name
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