python - How to find the cumulative sum of numbers in a list? -

- 

time_interval=[4,6,12]

i want sum numbers [4+0, 4+6, 4+6+12] in order list t=[4,10,22]. tried:

x=0 in (time_interval):     t1=time_interval[0]     t2=time_interval[1]+t1     t3=time_interval[2]+t2     print(t1,t2,t3)  4 10 22 4 10 22 4 10 22

if you're doing numerical work arrays this, i'd suggest numpy, comes cumulative sum function cumsum:

import numpy np  = [4,6,12]  np.cumsum(a) #array([4, 10, 22])

numpy faster pure python kind of thing, see in comparison @ashwini's accumu:

in [136]: timeit list(accumu(range(1000))) 10000 loops, best of 3: 161 per loop  in [137]: timeit list(accumu(xrange(1000))) 10000 loops, best of 3: 147 per loop  in [138]: timeit np.cumsum(np.arange(1000)) 100000 loops, best of 3: 10.1 per loop

but of course if it's place you'll use numpy, might not worth having dependence on it.


Comments

Post a Comment

Popular posts from this blog

javascript - Image onload event not firing in firefox -

-
i'm creating image preloader. works fine in browsers except firefox (testing firefox 10.0). input array of images called image_list . these images appended dynamically body of document , load callback attached, calls function update_progress . code follows: $(image_list).each(function() { var x = $('<img />') .load(function() {update_progress(percent_loaded += step);}) .attr('src', this) .appendto('body') .css('display', 'none'); .each(function() { if(this.complete) update_progress(percent_loaded += step); }); }); in firefox, load callback , update_progress never called. yet exact same code works fine in chrome , other browsers i've tested. there way detect when image has loaded in firefox? i first check see whether image has height, checking height property. if (the_image.height > 0) { // image loaded (possibly cached) } if have cached ...
Read more

android - getbluetoothservice() called with no bluetoothmanagercallback -

-
i getting getbluetoothservice() called no bluetoothmanagercallback error in android application. i have no idea causing or bluetooth manager callbacks. can give me idea of causing problem or start looking. by reading android source code, seems warning cannot about. source code shows if call bluetoothsocket#connect(); then call bluetoothadapter.getdefaultadapter().getbluetoothservice(null); the key here, null parameter passes in above line. due this, there no callback, , bluetoothsocket class throw out warning. since warning, not think need it. https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/bluetooth/bluetoothsocket.java line 306 https://android.googlesource.com/platform/frameworks/base/+/master/core/java/android/bluetooth/bluetoothadapter.java line 1610
Read more

sql - ASP.NET SqlDataSource, like on SelectCommand -

-
i'm working on asp.net. have sqldatasource query hardcoded on selectcommand: <asp:sqldatasource id="datasource1" runat="server" cancelselectonnullparameter="false" connectionstring="<%$ connectionstrings:s.properties.settings.connectionstring %>" selectcommand="select * [table] ([col1] case @col1_param when null col1 else @col1_param end) , ([col2] case @col2_param when null col2 else @col2_param end)" selectcommandtype="text"> <selectparameters> <asp:controlparameter controlid="textbox1" name="col1_param" propertyname="text" type="string" /> <asp:controlparameter controlid="textbox2" name="col2_param" propertyname="text" type="string" /> </selectparameters> what want if enter data on 1 textbox only, data display according textbox...
Read more