×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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

Summing Values in Matrix

Summing Values in Matrix

Summing Values in Matrix

(OP)
Does anyone know how I can add all the values in a i,j matrix. I want my program to generate a matrix using the following:

i =: 1..n
j =: 1..m

Matrices can be created for numerous values of n and m. An example is shown below:

L(i,j) = i*j

Where i and j are the indices, not functions for L. This creates a create a n x m matrix which is what I want but I want my MathCAD program to sum all values in the Matrix L for various i and j values. For instance if n=2 and m=2,

L = [ 1  2:
      2  4]

I want my value for the sum equal to 1 + 2 + 2 + 4 = 9.
Note I set my Array Origin to 1. Any help would be greatly appreciated.

RE: Summing Values in Matrix

Why can't you use the summation function from the Calculus Toolbar?

TTFN



RE: Summing Values in Matrix

(OP)
I have worked with the summation function for some time now. I thought i could not define matrices using this approach but apparently I wasn't defining the function correctly. Thank you for your help. I figured it out.

RE: Summing Values in Matrix

If you have large matrices, and/or have a lot of them to sum, you might find that

rows(L)*cols(L)*mean(L)

is quicker than using the summation operators.  It is on my PC in ver 11.2a.

Jon

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



News


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