Menu

Discussion Forum

New Discussion
查找

Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

empty plot

Posted 2025年2月4日 GMT+8 18:52 RF & Microwave Engineering 3 Replies

P Verschoor
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hi when i use 20*log(emw.normE) as expression in contour it works in one simulation but not the other. it says plot is empty. im using line current out of plane in one and point dipole in the other.

3 Replies Last Post 2025年2月5日 GMT+8 18:28
Robert Koslover Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 7 months ago 2025年2月5日 GMT+8 03:04

There's a number of possible reasons here. The plot is empty means that Comsol Multiphysics couldn't find anything to plot. A wild guess: In your plot settings, check which Dataset your plot is using. If it isn't actually set to one that both exists and has appropriate data in it, then this can generate a "plot is empty" warning.

-------------------
Scientific Applications & Research Associates (SARA) Inc.
www.comsol.com/partners-consultants/certified-consultants/sara
There's a number of possible reasons here. The plot is empty means that Comsol Multiphysics couldn't find anything to plot. A wild guess: In your plot settings, check which Dataset your plot is using. If it isn't actually set to one that both exists and has appropriate data in it, then this can generate a "plot is empty" warning.
David Greve
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 7 months ago 2025年2月5日 GMT+8 04:21

Dataset is one possible problem. Also, if you have multiple Studies or Components, make sure the variable names are correct.

Dataset is one possible problem. Also, if you have multiple Studies or Components, make sure the variable names are correct.
Acculution ApS Certified Consultant
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Posted: 7 months ago 2025年2月5日 GMT+8 18:28

Instead of plugging in your expression directly, go search for what is available under the relevant component and physics (Replace Expression button), and check your Dataset as already mentioned. Perhaps you are looking at the right dataset, but now the variable is called emw2.normE, comp2.emw2.normE or something to that effect.

(An unrelated detail here; note that log perhaps should be log10, as otherwise it will be ln, so just make sure you have it the right way around.)

-------------------
René Christensen, PhD
Acculution ApS
www.acculution.com
info@acculution.com
Instead of plugging in your expression directly, go search for what is available under the relevant component and physics (Replace Expression button), and check your Dataset as already mentioned. Perhaps you are looking at the right dataset, but now the variable is called emw2.normE, comp2.emw2.normE or something to that effect. (An unrelated detail here; note that log perhaps should be log10, as otherwise it will be ln, so just make sure you have it the right way around.)

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.

Suggested Content