Solved

How to Add same Index Array Elements in Octave

Posted on 2014-04-07
2
310 Views
Last Modified: 2014-04-08
I've generated elements w(i,j) of an array, most of which are zeros. Some of the elements have the same index j and I'd like to add them up and show each j with its corresponding summed up value. I tried v = sum(w) and it did show the summed up values but as elements of a large matrix, with most elements being zero. Is there a different way to accomplish that task?
0
Comment
Question by:judico
  • 2
2 Comments
 

Accepted Solution

by:
judico earned 0 total points
ID: 39985106
This is one possible solution, although I was hoping that there might be a way to avoid looping:

for j = 1:arr_rows
if sum(w)'(j) != 0
[j, sum(w)'(j)]
endif
endfor
0
 

Author Closing Comment

by:judico
ID: 39986323
This is the best solution I could come up with so far. There are memory problems for large arrays. I may address these problems later.
0

Featured Post

Live: Real-Time Solutions, Start Here

Receive instant 1:1 support from technology experts, using our real-time conversation and whiteboard interface. Your first 5 minutes are always free.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Does the idea of dealing with bits scare or confuse you? Does it seem like a waste of time in an age where we all have terabytes of storage? If so, you're missing out on one of the core tools in every professional programmer's toolbox. Learn how to …
Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
An introduction to basic programming syntax in Java by creating a simple program. Viewers can follow the tutorial as they create their first class in Java. Definitions and explanations about each element are given to help prepare viewers for future …
Viewers will learn how to properly install Eclipse with the necessary JDK, and will take a look at an introductory Java program. Download Eclipse installation zip file: Extract files from zip file: Download and install JDK 8: Open Eclipse and …

813 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

10 Experts available now in Live!

Get 1:1 Help Now