What is the meaning of numpy reduceat() in python? -



What is the meaning of numpy reduceat() in python? -

i new in python , read @ moment tutorial.

i confused reduceat() function.

i saw example:

np.add.reduceat([0,1,2,3,4,5,6,7],[0,4,1,5,2,6,3,7])[::2]

and result is:

array([ 6, 10, 14, 18])

how come out? can 1 explain me?

it sort of rolling apply, see:

in [59]: np.add.reduceat([0,1,2,3,4,5,6,7],[0,4]) out[59]: array([ 6, 22]) in [65]: np.add.reduceat([0,1,2,3,4,5,6,7],[4,1]) out[65]: array([ 4, 28]) in [66]: np.add.reduceat([0,1,2,3,4,5,6,7],[1,5]) out[66]: array([10, 18]) in [64]: np.add.reduceat([0,1,2,3,4,5,6,7],[5,2]) out[64]: array([ 5, 27]) in [61]: np.add.reduceat([0,1,2,3,4,5,6,7],[2,6]) out[61]: array([14, 13]) in [67]: np.add.reduceat([0,1,2,3,4,5,6,7],[6,3]) out[67]: array([ 6, 25]) in [62]: np.add.reduceat([0,1,2,3,4,5,6,7],[3,7]) out[62]: array([18, 7])

if want 1st value, can done in 1 shot:

in [63]: np.add.reduceat([0,1,2,3,4,5,6,7],[0,4,1,5,2,6,3,7]) out[63]: array([ 6, 4, 10, 5, 14, 6, 18, 7])

python numpy

Comments

Post a Comment

Popular posts from this blog

model view controller - MVC Rails Planning -

model view controller - MVC Rails Planning - i'm starting rails , i'm building app stores films info, user can watch film , give grade on web application. i have coded cinema model, controller , views. now, have 2 questions: should need create model , controller grading? in case, should create or should wait , create first users model , controller? yes, on model , controller grades. that'd feasible way maintain track of who's graded what. it's create first, i'd start users, since grades depend on both films , users. ruby-on-rails model-view-controller
Read more

ruby on rails - Devise Logout Error in RoR -

ruby on rails - Devise Logout Error in RoR - while using devise in ror, encountering unusual error when trying log out url different root url. displays me : actioncontroller::invalidauthenticitytoken in devise::sessionscontroller#destroy" for illustration if rooting path after log in '/structure', , seek log out '/general' error, while logging out '/structure' fine. any help highly appreciated. ruby-on-rails ruby devise
Read more

html - Submenu setup with jquery and effect 'fold' -

html - Submenu setup with jquery and effect 'fold' - i want open submenu jquery effect fold, problem if user "hover effect" fast menu remain open, how can avoid this, jquery code is: $('ul.mainmenu li').hover( function() { $(this).children('ul').show('fold', 570); }, function() { $(this).children('ul').hide('fold', 500); } ); my jsfiddle link is: http://jsfiddle.net/9wkbf/ updated fiddle the reason behind problem is, first event $(this).children('ul').show('fold', 570); queued , until completes, sec animation not start. the next snippet can workaround $('ul.mainmenu > li').hover( function() { $(this).children('ul').show('fold', 570); }, function() { $('ul:not(.mainmenu)').hide('fold', 500); } ); *important note : work current scenario. jquery html css
Read more