Mathcad: differentiating with indexes

Click For Summary
The user is encountering an error in Mathcad when attempting to differentiate a single-column matrix with an array index, receiving a message that states "a name is required here." The issue arises specifically under the square root in their equation. A suggested solution is to assign the indexed value of the matrix to a variable before performing the differentiation. This approach may help resolve the error and allow for successful differentiation. The discussion centers on troubleshooting this specific differentiation problem in Mathcad.
Uku
Messages
79
Reaction score
0
Hello!

The picture says a thousand words:
http://www.hot.ee/jaaniussikesed/v6rrand.jpg

In the last member under the square root, there is the error. For some reason I am not able to differentiate with an array index, ts1 is a single column 5 row matrix. How to solve this? The error says "a name is required here".

Thanks,
U.
 
Last edited by a moderator:
Physics news on Phys.org
Uku said:
Hello!

The picture says a thousand words:
http://www.hot.ee/jaaniussikesed/v6rrand.jpg

In the last member under the square root, there is the error. For some reason I am not able to differentiate with an array index, ts1 is a single column 5 row matrix. How to solve this? The error says "a name is required here".

Thanks,
U.

Try assigning ts1[i to a variable, t say, and differentiate that instead.

attachment.php?attachmentid=51500&stc=1&d=1349334622.jpg
 

Attachments

  • phys - 12 10 04 differentiation 01.jpg
    phys - 12 10 04 differentiation 01.jpg
    4.5 KB · Views: 1,539
Last edited by a moderator:

Similar threads

Exporting a matrix to Microsoft Access: Error using database/
  • · Replies 2 ·
Replies
2
Views
2K
Mastering Mathcad: Matrix Operations Made Easy | Step-by-Step Guide
  • · Replies 2 ·
Replies
2
Views
6K
Troubleshooting MathCAD: Rotation of Body Vector About an Axis
  • · Replies 1 ·
Replies
1
Views
8K
Undergrad Consistent matrix index notation when dealing with change of basis
  • · Replies 12 ·
Replies
12
Views
2K
High School Is it invalid to redefine the sgn function in this way in a proof?
  • · Replies 15 ·
Replies
15
Views
5K
MATLAB MATLAB newbie: how to index a string array?
  • · Replies 1 ·
Replies
1
Views
13K
MATLAB Organizing & Extracting Data from a Large Array
  • · Replies 3 ·
Replies
3
Views
3K
Undergrad General formula for a sequence of numbers
  • · Replies 4 ·
Replies
4
Views
2K
Error in inner product of vectors and index
  • · Replies 8 ·
Replies
8
Views
1K
Undergrad Find Practical Resonance Frequencies in Linear Differential Equations
  • · Replies 1 ·
Replies
1
Views
3K