Recent questions tagged Dataframe

0 votes

Q: Convert a list of data frames into one data frame

I have code that at one place ends up with a list of data frames which I really want to convert ... starting with (this is grossly simplified for illustration): listOfDataFrames...

asked Feb 8, 2022 in Education by JackTerrance

0 votes

Q: How to disable scientific notation?

I have a data frame with a column of p-values and I want to make a selection on these p-values. > pvalues_anova ... 7.125751e-01 5.193604e-01 4.835312e-04 Selection way: anovatest...

asked Feb 8, 2022 in Education by JackTerrance

0 votes

Q: Find the day of a week

Let's say that I have a date in R and it's formatted as follows. date 2012-02-01 2012-02-01 2012-02- ... generate the day by the date. Select the correct answer from above options...

asked Feb 8, 2022 in Education by JackTerrance

0 votes

Q: Changing column names of a data frame

I have a data frame called "newprice" (see below) and I want to change the column names in my program in R. > newprice ... 164 In fact, this is what am doing: names(newprice)[1]...

asked Feb 2, 2022 in Education by JackTerrance

0 votes

Q: How do I get the row count of a pandas DataFrame?

I'm trying to get the number of rows of dataframe df with Pandas, and here is my code. Method 1: total_rows ... What am I doing wrong? Select the correct answer from above options...

asked Jan 27, 2022 in Education by JackTerrance

0 votes

Q: Pandas index column title or name

How do I get the index column name in python pandas? Here's an example dataframe: Index Title Column 1 Apples 1 ... how to do this? Select the correct answer from above options...

asked Jan 27, 2022 in Education by JackTerrance

0 votes

Q: count the frequency that a value occurs in a dataframe column

I have a dataset |category| cat a cat b cat a I'd like to be able to return something like (showing unique values ... cat a 2 cat b 1 Select the correct answer from above options...

asked Jan 27, 2022 in Education by JackTerrance

0 votes

Q: Create an empty data.frame

I want a way to create a empty data.frame in R, I just want to point out data types for each column and name it without any row created. df...

asked Jan 24, 2022 in Education by JackTerrance

0 votes

Q: Sample random rows in dataframe

Can someone tell me a function which can return a specified no. of rows picked randomly without any replacement from a DataFrame in R? Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance

0 votes

Q: Filtering a dataframe in R based on multiple Conditions

I want to exclude specific participants from a DataFrame and create it from an existing DataFrame. I want a method ... worked for me. Select the correct answer from above options...

asked Jan 23, 2022 in Education by JackTerrance