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Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb ...
Evaluating string “3*(4+2)” yield int 18 [duplicate]
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arularul
13.6k11 gold badge5353 silver badges7575 bronze badges
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How do you specify a different port number in SQL Management Studio?
...am trying to connect to a Microsoft SQL 2005 server which is not on port 1433. How do I indicate a different port number when connecting to the server using SQL Management Studio?
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Get Unix Epoch Time in Swift
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YannikYannik
2,11422 gold badges1313 silver badges77 bronze badges
7
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Multiple Updates in MySQL
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Using your example:
INSERT INTO table (id,Col1,Col2) VALUES (1,1,1),(2,2,3),(3,9,3),(4,10,12)
ON DUPLICATE KEY UPDATE Col1=VALUES(Col1),Col2=VALUES(Col2);
share
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improve this answer
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How to get the first column of a pandas DataFrame as a Series?
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143
>>> import pandas as pd
>>> df = pd.DataFrame({'x' : [1, 2, 3, 4], 'y' : [4, 5...
Most common way of writing a HTML table with vertical headers?
...tain an equal number of columns (TD). Your header has 1 while the body has 3. You should use the colspan attribute to fix that.
Reference: "The THEAD, TFOOT, and TBODY sections must contain the same number of columns." - Last paragraph of section 11.2.3.
With that being said, the first option is t...
cannot load such file — zlib even after using rvm pkg install zlib
I installed zlib package and ruby 1.9.3 using rvm, but whenever I try to install
gems it says
cannot load such file -- zlib
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Thread-safe List property
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edited May 3 '11 at 19:09
answered May 3 '11 at 19:04
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