aggregate Questions
2
My project is currently setup so that the MyApp target includes a few Run Script Build Phases. These scripts depend on the sequence of Build Phases. For example, there's a script that runs before C...
3
Solved
I have 4 populations with known means and standard deviations. I would like to know the grand mean and grand sd. The grand mean is obviously simple to calculate, but R has a handy utility function,...
Shush asked 10/2, 2012 at 2:47
2
Solved
I have a dataset like this:
df = data.frame(group = c(rep('A',4), rep('B',3)),
subgroup = c('a', 'b', 'c', 'd', 'a', 'b', 'c'),
value = c(1,4,2,1,1,2,3))
group | subgroup | value
--------------...
Adara asked 25/11, 2014 at 18:55
2
Solved
I have a case where I may have null values in the column that needs to be summed up in a group.
If I encounter a null in a group, I want the sum of that group to be null. But PySpark by default see...
Catgut asked 18/1, 2021 at 6:34
2
Solved
Three different implementations of finding the sum of an IEnumerable < int> source are given below along with the time taken when the source has 10,000 integers.
source.Aggregate(0, (result, e...
Whim asked 14/6, 2012 at 9:18
3
Solved
I'm currently working a lot with DDD, and I'm facing a problem when loading/operating on aggregate roots from other aggregate roots.
For each aggregate root in my model, I also have a repository. ...
Bureaucratize asked 7/2, 2011 at 9:28
5
Solved
I have a simple dataframe as such:
ID Col1 Col2 Col3 Col4
1 NA NA NA NA
1 5 10 NA NA
1 NA NA 15 20
2 NA NA NA NA
2 25 30 NA NA
2 NA NA 35 40
And I would like to reformat it as such:
ID Col1 ...
6
Solved
How can I select the first and last row for each unique id in the following dataframe?
tmp <- structure(list(id = c(15L, 15L, 15L, 15L, 21L, 21L, 22L, 22L,
22L, 23L, 23L, 23L, 24L, 24L, 24L, 24...
7
Edit -- This question was originally titled << Long to wide data reshaping in R >>
I'm just learning R and trying to find ways to apply it to help out others in my life. As a test case, I'...
2
Solved
I am trying to make a groupby + sum on a Julia Dataframe with Int and String values
For instance, df :
│ Row │ A │ B │ C │ D │
│ │ String │ String │ Int64 │ String │
├─────┼────────┼────────┼──────...
2
I have a query that makes use of the pipeline feature of $lookup and it also uses $expr.
Well, it works, but the performance is not great. It looks up stuff in a collection with about 4000 docs and...
4
Given this FruitBasket model,
class FruitBasket(Model):
fruit = CharField(max_length=128)
count = PositiveIntegerField()
And this sample data,
id fruit count
----- ---------- -----
0 apple ...
1
I have 2 Collections assume as 1 to many relation, e.g. user and comments. requirement is to merge user with their latest comment as single object and return the list of the newly merged object as ...
3
Solved
I am new to mongodb and trying to learn Mongodb queries
{
"_id" : ObjectId("59815d4704ca1760a45957ca"),
"userEmail" : "[email protected]",
"expenseAmount" : 200,
"expenseRemark" : "aa",
...
4
Solved
I'm trying to calculate asset-weighted returns by asset class. For the life of me, I can't figure out how to do it using the aggregate command.
My data frame looks like this
dat <- data.fram...
5
Solved
I do not get to understand yet the aggregate function:
For example, having:
val x = List(1,2,3,4,5,6)
val y = x.par.aggregate((0, 0))((x, y) => (x._1 + y, x._2 + 1), (x,y) => (x._1 + y._1, ...
1
I have a table that looks similar to this, with a multiindex on (A, B)
>>> columns = ["A", "B", "C", "D"]
... data = [
... [1, 1, 99, 22],
... [1, 2...
Dvina asked 1/8, 2020 at 11:48
4
Solved
I am working with this data set census.csv
Code:
df = pd.read_csv('Data/census.csv')
df = df[df['SUMLEV']==50]
print(df.head())
This is how my data looks like:
SUMLEV REGION DIVISION ... RNETMIG...
Ademption asked 19/7, 2020 at 12:8
1
These are quotes from Oracle docs:
[Optional] Merge by combining the two aggregation contexts and return a single context. This operation combines the results of aggregation over subsets in orde...
1
Solved
Can someone explain to me what is the difference of these two functions in postgres and when to you which?.
I have this data in my table and would like to compute the standard deviation of trips' s...
Durward asked 30/6, 2020 at 14:55
2
I am dipping my feet into event sourcing pattern and trying to make sense of aggregates.I have read a few blogs and now I am more confused than ever before.
From what I inferred aggregates should ...
Isogamy asked 23/4, 2018 at 15:50
7
I have a data frame with about 200 columns, out of them I want to group the table by first 10 or so which are factors and sum the rest of the columns.
I have list of all the column names which I w...
Mccaffrey asked 21/11, 2011 at 13:38
2
Solved
I have the following data.frame:
x <- data.frame(A = c("Y", "Y", "Z", NA),
B = c(NA, TRUE, FALSE, TRUE),
C = c(TRUE, TRUE, NA, FALSE))
And I need to compute the following table with xtabs:
...
1
I have tried other similar kind of questions available but nothing seems to work for me.
I have two collections:
leads:
const mongoose = require("mongoose");
const id = mongoose.Schema.Types.Obje...
2
Solved
This question is building up on another question R combining duplicate rows by ID with different column types in a dataframe. I have a datatable with a column time and some other columns of differe...
Perfect asked 18/5, 2020 at 18:15
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