# Differentials calculus in E **URL:** \ **Category:** Elasticsearch\ **Created:** [August 28, 2018, 5:21pm UTC](https://discuss.elastic.co/t/differentials-calculus-in-e/146402 "2018-08-28T17:21:06Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![mehdi-gital](https://avatars.discourse-cdn.com/v4/letter/m/65b543/32.png) [@mehdi-gital](https://discuss.elastic.co/u/mehdi-gital)\ **Post date:** [August 28, 2018, 5:21pm UTC](https://discuss.elastic.co/t/differentials-calculus-in-e/146402/1 "2018-08-28T17:21:07Z")
Here's a situation that's similar to my real question: Let's say I'm recording the temperatures of all major cities in the world once per day. So, each document has the following fields: timestamp city\_name temp The type of query that I'm interested in is of the following form: Get all cities C and timestamps T such that the temperature jumped more than a certain amount compared to the week before. More precisely: temp(C, T) \> temp(C, T-one week)\*lambda My understanding is that Elastic looks only within the documents but I don't mind being wrong if there's a built-in method for handling such queries. Obviously, my goal is to avoid writing a big wrapper around Elastic when I create my API. Thank you! ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [September 25, 2018, 5:21pm UTC](https://discuss.elastic.co/t/differentials-calculus-in-e/146402/2 "2018-09-25T17:21:11Z")
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