Linked Questions

3 votes
0 answers
84 views

What's inside Dataset? [duplicate]

It seems that Dataset has rich structures in them, for example: ds = Dataset[{<|"a" -> 1, "b" -> "x", "c" -> {1}|>}]; TreeForm[dataset] Could you ...
xslittlegrass's user avatar
39 votes
1 answer
809 views

Visualizing Type System Operations

With the introduction of Dataset in version 10, Mathematica acquired a static type-checking subsystem. A fair number of dataset-related questions here on MSE ...
WReach's user avatar
  • 69.1k
16 votes
2 answers
2k views

How to work with a Dataset?

I have an application for which a Dataset appears useful. I want a structured dataset which consists of a set of records, which are presumably Associations. For the data set, I would like to be able ...
David Keith's user avatar
  • 4,604
13 votes
1 answer
468 views

How to make datasets display correctly?

NB: The problem illustrated below is truly ubiquitous. I hope the examples given below are sufficiently different to demonstrate this fact, and to discourage answers that hinge on the details of the ...
kjo's user avatar
  • 11.7k
10 votes
2 answers
262 views

Using Merge[Identity] and Transpose on a Dataset

While experimenting with this answer, I ran across the following: ...
user's user avatar
  • 103
2 votes
3 answers
232 views

ScientificForm in Dataset

Via SQL query I produce a list ...
Lea's user avatar
  • 942
11 votes
1 answer
137 views

Nondeterministic $Failed when mapping over a Dataset

Consider the following simplified example (on Mathematica 12): ds = Dataset@{<|"hell" -> "o"|>, <|"hell" -> "no"|>}; ...
Shwouchk's user avatar
  • 507
11 votes
1 answer
200 views

Odd StringTake problem in Dataset

Bug introduced in 10.0 and fixed in 10.4 Dataset is new in 10.0 10.2 Win64 Works fine... ...
Ymareth's user avatar
  • 4,751
6 votes
1 answer
326 views

Explaining error when using Part inside Module in Dataset

I have a vague recollection of seen an explanation for this, but I can not find it, so it may be a false memory. Will delete if duplicated. Let ds be a simple <...
rhermans's user avatar
  • 36.8k
18 votes
0 answers
292 views

V10's TypeSystem - what are these function useful for? [closed]

The symbols in the TypeSystem` context are clearly used for working with Datasets, but they seem powerful. I was hoping that someone could help explain how they work and is they are useful for ...
M.R.'s user avatar
  • 31.6k
5 votes
1 answer
148 views

PDF for MixtureDistribution fails in Dataset Query in 11.1

I have the results of a process involving FindDistribution as a Dataset of probability distributions. Attempting to plot the <...
Edmund's user avatar
  • 42.4k
3 votes
2 answers
152 views

Composition with Transpose failure with Dataset

Is the failure of the 2nd Transpose here a known bug? Dataset[{{0, 10}, {2, 11}, {3, 12}}][ Transpose /* Map[MinMax] /* Transpose] // Normal ...
alancalvitti's user avatar
  • 15.1k
0 votes
1 answer
76 views

What's the meaning of TypeSystem`Atom and TypeSystem`Vector?

SemanticImport is probably failing to import the data. In fact the log message is transformed into this weird entity. Dataset[List["Error calling Sogei service http://lb-ven-onl-psqf.winco.local/...
Revious's user avatar
  • 540
2 votes
2 answers
94 views

EntityFunction for Relational Database error [closed]

I am a student and I am new of Mathematica. I am working with relational databases and I am following the guide "Relational Database quick start" find here: https://reference.wolfram.com/language/...
Daniele F's user avatar
3 votes
1 answer
93 views

Dataset column stubs in query result

Suppose I have a dataset with a header row. ds = Dataset[AssociationThread[{"x", "y", "z"}, #] & /@ RandomReal[{0, 1}, {10, 3}]]; I want to construct the ...
Alan's user avatar
  • 13.8k