Questions tagged [rowwise]
229 questions
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Using R to do aggregation like tapply in matrice rowwisely
I have a problem in doing matrix computation, could you please shed some light upon it.
Thank you very much in advance!
I have a data frame genderLocation and a matrix test, they correspond to each other with the index
genderLocation[,1:6]
…
Bylon
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2 answers
Add a row-wise specific column result from left join of two dataframes
Info: So I have 2 dataframes, we'll call them dfa and dfb. Dfa has a master list of things I'm interested in, and dfb has a list of things I want to check for in dfa if they already exist. I'm using a left join to carry over some information in a…
SqueakyBeak
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3 answers
Combine matrices row by row
I have two matrices of arbitrary sizes, e.g. matrix 1 (n * m) and matrix 2 (k * l). Is there a (convenient) way in R to cbind them row-by-row, to form a (n * k) * (m + l) matrix where each row of matrix 1 has a chance to be cbinded to each row of…
Ken Chen
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How to find profit or loss percentage from consecutive rows
I need a help in calculating profit/loss percentage. I have a data frame as follows
Date Price
2017-5-20 50
2017-5-20 60
2017-5-20 45
I need a new column in dataframe which calculates profit or loss percentage of…
Pranay Dishan
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