Recent questions tagged dataframe

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dataframe - How to save a data.frame in R?

I made a data.frame in R that is not very big, but it takes quite some time to build. I would to save it ... which I can than again open in R? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - R - add column that counts sequentially within groups but repeats for duplicates

I'm looking for a solution to add the column "desired_result" preferably using dplyr and/or ave(). See the data frame ... .names = c(NA, -8L)) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - What can R do about a messy data format?

Sometimes I see data posted in a Stack Overflow question formatted like in this question. This is not the first ... a great deal of trouble? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - R: Assign variable labels of data frame columns

I am struggling with variable labels of data.frame columns. Say I have the following data frame (part of much ... variable labels as a vector. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - R self reference

In R I find myself doing something like this a lot: adataframe[adataframe$col==something]<-adataframe[adataframe$col== ... something]<-$self+1 ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - What is about the first column in R's dataset mtcars?

I think I am missing a fundamental concept about R's data frames. head(mtcars) mpg cyl disp hp drat wt qsec vs ... data in a plot for example? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - Why are Pandas and GeoPandas able to read a database table using a DBAPI (psycopg2) connection but have to rely on SQLAlchemy to write one?

Context I just get into trouble while trying to do some I/O operations on some databases from a Python3 ... without using SQLAlchemy engine? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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519 views

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dataframe - Vectorized "in" function in julia?

I often want to loop over a long array or column of a dataframe, and for each item, see if it is a member ... don't know of anything in base. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - Why does Spark think this is a cross / Cartesian join

I want to join data twice as below: rdd1 = spark.createDataFrame([(1, 'a'), (2, 'b'), (3, ' ... ,val#7L] +- Scan ExistingRDD[idx#40L,val#41] See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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727 views

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dataframe - Join two data frames in R based on closest timestamp

Hi I have two tables (table1 and table2 below) and would like to join them based on the closest timestamp to form ... ), class = "data.frame") See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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524 views

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dataframe - Populating a data frame in R in a loop

I am trying to populate a data frame from within a for loop in R. The names of the columns are generated ... me know if I wasnt clear. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dataframe - How do I remove specified rows from a data frame in R, but the rows are eliminated according to another column variable?

I have a data frame of values, with variable names that correspond to co-ordinates and event time per simulation. head_data ... efficient way of doing so for a larger data frame....

asked Jan 29, 2021 in Technique[技术] by 深蓝 (71.8m points)

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