Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Simple Array Addition

Simple Array Addition

Simple Array Addition

I am having a very difficult time with a very simple problem.

I have an array, RoadWidth[n (where n= 1..48). I want to add a constant to each of the values in the array. In my head this can be accomplished with a simple for loop but I just can't get it to work.

for n = 1..48
   SubgradeWidth[n = (RoadWidth[n) + 2

This is obviously the wrong way to do it. (I know I could just add an array of the same size that has a 2 in each variable spots but that just seems like it would take up a lot more room on my calc sheet and would take more effort to change the 2 to any other variable that I want at some later date.)

Any insight on this lovely Friday morning?



RE: Simple Array Addition

I just tried defining road as a matrix (48x1).  Then define subgrade= road+2.  It works fine.  The result is a matrix with individual values 2 greater than road.  You maybe be having a problem using the range variable n.  

RE: Simple Array Addition


Thank you. I knew it was something simple.


RE: Simple Array Addition

there's a few ways of doing it, the obvious one being

SubgradeWidth[n: 2+RoadWidth[n


Greg Locock

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

RE: Simple Array Addition

Matrix + Constant
Simply typr


(to get it right assume you are wrong)

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close