python - Calculating average from ith element in list of tuples -


note: i've done edits dataset think work better calculating average.

my data this:

[[2015, 0.23, 0.45, 1.23], [2014, 1.22, 2.54, 0.98], [2013, 0.33, 2.11, 0.43], ...]

where data lists within list. first element in sublist year of growth, , following 3 floats ring widths year. question this: there way calculate average of last 3 elements in each sublist, , generate new list, year, average growth like:

[[2015, 1.58], [2014, 0.956], ...]

where 1.58 (1.22 + 2.54 + 0.98)/3.

sorry confusion before, i'm new stack overflow, , can tell more information better.

here code have far:

   in list[0]:       newlist = [(list[1] + list[2] + list[3])/3]

but doesn't seem work.

any appreciated. thanks!

if data in form:

trees= [[2015, 0.23, 0.45, 1.23],         [2014, 1.22, 2.54, 0.98],         [2013, 0.33, 2.11, 0.43]]

you do:

new_trees=[]  x in trees:     average="{0:.2f}".format(sum(x[1:])/len(x[1:]))     new_trees.append([x[0]]+[average])                      #year + average

this output:

>>> new_trees [[2015, '0.64'], [2014, '1.58'], [2013, '0.96']]

Comments

Post a Comment

Popular posts from this blog

java - Spring Data JPA: Why findOne(id) executing delete query internally? -

i have 1 application using @manytomany annotation link 2 different entities 1 parent entity. not sure if have implemented properly. when execute .findone() on parent entity's repository find it, @ first fetch data along executing delete queries internally delete record mapping table (a table jpa creates after adding @manytomany annotation.). following generated sql queries , code snippet: java class @entity @table(name = "inventory") public class inventory { @id long id; // many other properties @manytomany(fetch=fetchtype.lazy) private list<stream> streams; @manytomany(fetch=fetchtype.lazy) private list<subject> subjects; } there no other annotation i've put in stream , subject entity class link inventory class. when run app, create following tables: inventory stream subject inventory_stream inventory_subject (inventory_stream , inventory_subject, 2 tables created automatically, don't k...
Read more

python - Mongodb How to add addtional information when aggregating? -

i beginner , wrote line pipeline works, wanna add other information output, screen name , or number of tweets.i tried add under $group gave me syntax error everytime here pipeline: def make_pipeline(): # complete aggregation pipeline pipeline = [ { '$match': { "user.statuses_count": {"$gt":99 }, "user.time_zone": "brasilia" } }, { "$group": { "_id": "$user.id", "followers": { "$max": "$user.followers_count" } } }, { "$sort": { "followers": -1 } }, { "$limit" : 1 } ]; i using on example : { "_id" : objectid("5304e2e3cc9e684aa98bef97"), "text" : "first week of school on :p", "in_reply_to_status_id" : null, "retweet_count" : null, ...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more