nicoletta | A minimalistic static blog generator
kandi X-RAY | nicoletta Summary
kandi X-RAY | nicoletta Summary
Inspired by: James Harding's post.
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nicoletta Examples and Code Snippets
Community Discussions
Trending Discussions on nicoletta
QUESTION
I have two data frames
columns df1= a, b, c, d
columns df2= e, f, c, d
I want to say that if df1$a == df2$e
and at the same time df1$b == df2$f
I want to print in a new column df1$x
the values of the corresponding df2$c
.
So I wrote this command df1$x <- ifelse(df1$a %in% df2$e & df1$b %in% df2$f, df2$c, ifelse (NULL))
But the values in df1x
are not correct. I think I have to do a while loop, but I have no idea from where to start.
Nicoletta
...ANSWER
Answered 2020-Jan-24 at 14:37To merge two data frames by multiple columns you can use merge
and corresponding by.x
and by.y
. Both of those accept vector of column names. Parameter all.x
means all data from first df1
will be preserved.
QUESTION
I would like some help on my program. It is supposed to randomize the seating order of my class. However, I keep getting an "Out of Range Exception".Although all indices start with 0, I tried but was not able to fix it. How do I get rid of this. If possible, could it be possible to not repeat the elements in the list? I apologize for my inaccurate question, but here is my code...
...ANSWER
Answered 2017-Nov-05 at 21:47C# is 0 Indexed, start at 0 not at 1.
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Install nicoletta
You can use nicoletta like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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