**368 associations questions.**

I know that it is the standard functionality of Merge to combine the values of the same keys among associations.
Now I would like to deal with a situation in which,...

For neural networks mathematica likes 2 ways to structure training sets:
...

I am trying to understand the structure and the use of Dataset and I came across something new to me.
First check this example:
...

Bug introduced in 10.0 or earlier and persisting through 11.3
Here is a nice graph whose vertices are Associations:
...

The Dataset I am working with has the following nested structure.
...

How do i smartly join a List of Associations (eg. returned by ParallelTable) such that i get a single Association?
...

I expected that something like this
...

I'm delivering an upcoming course on Data Science with the programming/analysis done predominantly in the Wolfram Language. I created the following table to leverage students' familiarity with Lists ...

I was comparing RAM and CPU efficiency for List, Rule, Association, Function. The following code
...

I'm not sure if this is a bug, or if I just am not understanding, properly, how to create a function.
I am able to use a list of rules to update an association like so:
...

I have a notebook that I am working on that starts with an imported CSV file. Many of the rows have blank data in them. I have used the following command to establish a list of associations:
...

I have a list of associations, and I would like to make it so that an expression automatically reads the associated data from the associations list, that has the same name, into the expression. An ...

As a learning exercise I’m trying to convert some data we have from spreadsheets into an association of associations. However, I’ve only managed to format two different associations, a key of the ...

Should I be able to use the "list of functions" approach to getting a stable sort of an association? In 11.1 I see,
...

I have just noticed thatx /. <|x -> 123|> evaluates to123In other words, the association seems to behave as a ...

How do I convert {{"a" : 13, "z" : 24},{"f" : 17, "h" : 94}} to get
{{"a" -> 13, "z" -> 24},{"f" -> 17, "h" -> 94}}
I am trying to change : to ->

I'm very excited about the brand new Dataset function. I have played with it in Wolfram Cloud, and haven't figured out how can I add a new column into an existing <...

I have a relatively simple dataset that provides a list of values for a list of countries:
...

Say I have a list of Association,SeedRandom[45]
test = Association[Table[i -> RandomInteger[30], {i, 6}]] <|1 -> 18, ...

I want to draw a DensityPlot similar to below:-DensityPlot[Sin[x] Sin[y], {x, -4, 4}, {y, -3, 3}]But my problem is, I am not given the function itself. I am ...

I have an association dataset with a depth of two (each value is an association too, and the size of the dataset ~ 30000 keys and an average size of values are ~2000 keys association). The dataset ...

I have a list of rules: list = {a1 -> 0, a2 -> 3x, a4 -> 0, a5 -> 5x+3...}.
I would like to append to another list the nonzero rules, which are: ...

Wolfram pages "Mathematica Quick Revision History" in Mathematica 10.0.1 release says:
"New operators and compositions of operators enabled for associations
functions such as Dataset and Query"
...

I have a dataset where values are associations too.
...

Solution: Pi is allowed in training sets, but not in batches generated by the batch generating function
preamble:
I want to generate my own batches of training data for training a deep CNN.
ref/...

I cannot understand why I need a second pure function when trying to sort Association by Key. Here is an example
...

Suppose a matrix is given where both rows and columns are keyed, for example this correlation matrix:
...

I have a extremely simple question on Button. I tried to append values to associations. The Append works good with given value outside button, but once it is inside Button, it doesn't append the value ...

Using Association to generate complicated data types is very comfortable, in particular if one uses those tricks from How to make use of Associations?. However, I ...

There’s an inconsistency in how Missing values are imputed in Query, with ...

I try to calculate the average length (in words) of paragraphs in a document. The data look like:
...

Consider following association:
...

I have an Association[] which is the result of an intensive computation. Its values include the variable x and I would like to ...

I have some issues with the Lookup in Association. My association looks as:
...

I try dynamically to add new keys and update the values of existing keys in given dataset (Association). I implement this by the following code:
...

Bug introduced in 10.4.0 and persisting through 11.3.0
CASE:3824590
[...] Developers are discussing this behavior. [...] I will let you know when I have definite information on this. [...]
...

Given a list of values such asvals = {{{{0., 633.25}, {642.96, 677.34}}, {{591.56, 632.45}, {634.9, 715.6}}}}and a list of "Dimensions" such as
...

Bug present in 10.0.2 or earlier, and fixed in 10.4
If I try to export this toy code as ExpressionML or just XML:
...

It seems ListPlot will somehow drop the trailing list of Associations when the Association ...

I have a set of algebraic expressions of a certain form, and I would like to make them into Associations in a specified way. My expressions are formed of two heads, ...

Let's say I have a table in Mathematica like so:
Where the first row is the header, and first column is also a header (similar to a multiplication table). ie S_AS_A = Es; S_BS_A = ss_sigma;
The ...

Say I have the following code:Merge[{<|"a" -> 1, "b" -> 2|>, <|"a" -> 2, "c" -> 3|>}, Identity]The output is:
...

Considering a DatabaseExample included with Mathematica:
...

I was wondering, why is extracting from an Association slightly faster than extracting from a List?
...

Hello, i make another try... I have to import a file like this below (it is an excel file, i show you just the beginnig. it should have thousend of rows and columns). After i've imported the file i ...

I have some large nested expression containing associations and I'd like to extract the nth key inside one of them, using part syntax.
Here's a tiny example:
...

I'm trying to create a function that builds a replacement rule from a given pattern and I have trouble understanding what's going wrong.
After having written most of the question, I see that it got ...

- dataset
- list-manipulation
- bugs
- query
- filtering
- pattern-matching
- data-structures
- replacement
- performance-tuning
- evaluation
- map
- function-construction
- rule
- functions
- gathering
- hold
- assignment
- core-language
- language-design
- plotting
- programming
- import
- parallelization
- data
- missing

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