data-management Questions
3
Solved
I have a Realm Object modeled as so
class WorkoutSet: Object {
// Schema 0
dynamic var exerciseName: String = ""
dynamic var reps: Int = 0
// Schema 0 + 1
dynamic var setCount: Int = 0
}
I ...
Mendymene asked 20/1, 2016 at 4:41
6
Solved
I am working with the following data:
District <- c("AR01", "AZ03", "AZ05", "AZ08", "CA01", "CA05", "CA11", "CA16", "CA18", "CA21")
I want to split the string after the second character and p...
Nativity asked 5/2, 2020 at 21:0
10
Solved
I am trying to read a CSV from github into R:
latent.growth.data <- read.csv("https://github.com/aronlindberg/latent_growth_classes/blob/master/LGC_data.csv")
However, this gives me:
Error i...
Orgiastic asked 21/1, 2013 at 15:20
9
Solved
I have a large data.frame that was generated by a process outside my control, which may or may not contain variables with zero variance (i.e. all the observations are the same). I would like to bui...
Hardware asked 10/1, 2012 at 14:57
5
Solved
In the interest of replication I like to keep a codebook with meta data for each data frame. A data codebook is:
a written or computerized list that provides a clear and comprehensive descriptio...
Hasseman asked 17/3, 2011 at 0:3
2
Solved
I have a very large (too big to open in Excel) biological dataset that looks something like this
year <- c(1990, 1980, 1985, 1980, 1990, 1990, 1980, 1985, 1985,1990,
1980, 1985, 1980, 1990,...
Tarsier asked 18/11, 2018 at 0:34
3
Solved
Define:
df1 <-data.frame(
id=c(rep(1,3),rep(2,3)),
v1=as.character(c("a","b","b",rep("c",3)))
)
s.t.
> df1
id v1
1 1 a
2 1 b
3 1 b
4 2 c
5 2 c
6 2 c
I want to create a third variable f...
Hayes asked 28/6, 2011 at 21:38
3
Solved
I have a data frame like this:
id y1 y2 y3 y4
--+--+--+--+--
a |12|13|14|
b |12|18| |
c |13| | |
d |13|14|15|16
I want to reshape in such a way that I end with two columns. The above example...
Porosity asked 3/7, 2017 at 22:58
4
Solved
I've been searching for an article that explains NSCoding (NSKeyedArchiver...) advantages and disadvantages over use of CoreData (SQLite....).
There's a lot of options, I can implement my own cus...
Hoosegow asked 5/3, 2012 at 15:40
2
In analyzing data the metadata about variables is extremely important. How do you manage this information in R?
For example, is there a way to specify a label that will be printed instead of...
Merilynmeringue asked 12/11, 2010 at 17:45
3
Solved
I have a huge log file in this kind of structure:
"timestamp": {"identifier":value}
"1463403600":{"AA":74.42},
"1463403601":{"AA":29.55},
"1463403603":{"AA":24.78},
"1463403604":{"AA":8.46},
"14...
Middleclass asked 16/5, 2016 at 13:17
4
My question surrounds around one single point - data management in mobile application. I have created a mobile application where data comes from server. The data includes both text and images. Foll...
Neils asked 7/10, 2015 at 10:24
3
Solved
I'm new to Android development, so I'm trying to do an app that stores information about a warehouse. However, I'm afraid that if I perform an update, the user data will get lost. Do I have to mana...
Disorderly asked 4/7, 2015 at 20:12
4
Solved
I have a data set that looks like this:
structure(list(A = structure(c(1L, 1L, 1L, 1L, 1L, 1L), .Label = c("1",
"2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13",
"14", "15", "16", ...
Quadrennium asked 23/5, 2013 at 19:41
5
Solved
I have two data frames with a range of cases. One from time 1 and one from time 2. I am looking for a way to quickly identify cases where changes have occurred between time1 and time 2 and I am kin...
Zoa asked 14/2, 2013 at 0:25
2
Solved
Say I have this data,
(df <- data.frame( col1 = c('My','Your','His','Thir'), col2 = c('Cat','Dog','Fish','Dog')))
col1 col2
1 My Cat
2 Your Dog
3 His Fish
4 Thir Dog
and I want to combine t...
Reynold asked 28/11, 2012 at 1:12
3
I would like to learn Database systems implementation in Depth. Is there an open-source simple implementation of database for educational purpose that I can go through the code? Like there ar...
Chelate asked 20/4, 2012 at 5:55
2
Solved
Define a list dats with two dataframes, df1 and df2
dats <- list( df1 = data.frame(a=sample(1:3), b = sample(11:13)),
df2 = data.frame(a=sample(1:3), b = sample(11:13)))
> dats
$df1
a b
1...
Junko asked 18/6, 2011 at 21:31
3
Solved
I'm trying to write a function that behaves as follows, but it is proving very difficult:
DF <- data.frame(x = seq(1,10), y = rep(c('a','b','c','d','e'),2))
> DF
x y
1 1 a
2 2 b
3 3 c
4 4 d...
Rigsdaler asked 13/4, 2011 at 18:23
1
Solved
Lets say I have a data frame with the following structure:
DF <- data.frame(x = 0:4, y = 5:9)
> DF
x y
1 0 5
2 1 6
3 2 7
4 3 8
5 4 9
what is the most efficient way to turn 'DF' into a dat...
Dilatant asked 4/4, 2011 at 19:32
3
Solved
I am currently working on an ASP.NET MVC2 project. This is the first time I am working on a real MVC web application. The ASP.NET MVC website really helped me to get started really fast, but I stil...
Gusti asked 21/5, 2010 at 12:1
1
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