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Results tagged with associations
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user 168
Questions on the associative data-structure introduced in Mathematica version 10.
11
votes
3
answers
334
views
Move the outer key inward in an association
I have a list that looks like:
{15000001-><|"Loss" -> 2.85396*10^8, "Exposure" -> 6.61052*10^10|>,
15000002 -> <|"Loss" -> 1.25297*10^8, "Exposure" -> 1.57863*10^11|>,
15000003 -> <|"Loss" -> 2.059 …
- 3,796
5
votes
2
answers
479
views
Can I sum or mulitply 2 columns in a list of associations
I have a list of associations. I will need to add 2 columns (or perform some other arithmetic operation) and put the answer in a new column. …
- 3,796
4
votes
3
answers
264
views
Change value associated with keys using alternatives
I have a List of Associations that contains a Key called "ClaimBasis". There are about 10 possible values that ClaimBasis can take on, one of them being the value Null. … Perhaps my "default" method for setting values in a List of Associations is not the best way to do it, in which case I'd appreciate knowing a better alternative. …
- 3,796
3
votes
1
answer
166
views
Quotes vs No Quotes for Association Keys
I've tended to not put quotes around the names of my Key when making Associations. …
- 3,796
8
votes
2
answers
768
views
Replace Missing[Unmatched] with zero
After a left JoinAcross, I have a number of Missing["Unmatched"] values in my list of associations. I'd like to set them all equal to zero. … "ReportedEP" -> 28535., "ReportedLI" -> 0., "ELI" -> 25619.3,
"DLI" -> 25619.3, "EstimatesEP" -> Missing["Unmatched"]|>
Edit
I neglected to mention that I need to do this to the entire list of associations …
- 3,796
2
votes
0
answers
101
views
Adding an unused column creates an error in JoinAcross
I'd been having trouble using JoinAcross on two datasets. After going through the answers to my original question and fixing my code, I find I'm now having a problem that I think is being caused by m …
- 3,796
4
votes
2
answers
136
views
Finding associations not having value Missing["Unmatched"] in a list of associations
I have a list of Associations, a:
{<|"Year" -> 2011, "Loss" -> 141972., "Factor" -> 1.02884|>,
<|"Year" -> 2009, "Loss" -> 27081., "Factor" -> 1.01863|>,
<|"Year" -> 2014, "Loss" -> 770.693, "Factor …
- 3,796
8
votes
2
answers
200
views
multiple maps to extract from association
I've got some code that has to extract a lot of information, including some statistics, from an association. There's a lot of repetition in my code and I'm hoping that there's some way to simplify it …
- 3,796
6
votes
1
answer
486
views
Sum some columns in list of associations grouped by other columns
I often need to sum values in a list of Associations according to some columns in that Association. I have a way of doing it, which will be the main part of this question, but it seems awkward. …
- 3,796
0
votes
1
answer
194
views
Aggregate function problem
I use a function to do something similar to a SQL sum. I've asked about simplifying it in another post. I'm still using this function and it works well for aggregates like Total or Mean. It doesn't …
- 3,796
7
votes
2
answers
290
views
Allocate amount A according to the distribution of amount B
Originally I didn't use associations, and did a lot of joining. Using associations seems like a better idea but this level of complication is daunting. …
- 3,796