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Plotting over a circle....

Posted 13 sept. 2015, 23:20 UTC−4 Version 4.4 5 Replies

Aamir Qamar
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Hello everyone, I would like to ask how to plot data over a circle like cutline is used to plot data over a line while cutpoint over a point similarly how can one plot over a circle. I used trigonometric functions to form circle by using cutpoint but the graph plot is not ok...
5 Replies Last Post 14 sept. 2015, 22:01 UTC−4
Gunnar Andersson COMSOL Employee

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Posted: 9 years ago 14 sept. 2015, 02:07 UTC−4
This sounds like a job for the Parametric Curve 2D data set.
This sounds like a job for the Parametric Curve 2D data set.
Aamir Qamar
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Posted: 9 years ago 14 sept. 2015, 02:26 UTC−4
Thanks for the reply Gunnar. I used the parametric curve 2D but what expressions should i write in the x and y to have a circle. I used the expression r*cos(range(0,0.01,2*pi)) and r*sin(range(0,0.01,2*pi)) for the x and y but the range function does not work it is giving the message of unknown function or operator range.....
Thankssss
Thanks for the reply Gunnar. I used the parametric curve 2D but what expressions should i write in the x and y to have a circle. I used the expression r*cos(range(0,0.01,2*pi)) and r*sin(range(0,0.01,2*pi)) for the x and y but the range function does not work it is giving the message of unknown function or operator range..... Thankssss
Gunnar Andersson COMSOL Employee

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Posted: 9 years ago 14 sept. 2015, 02:31 UTC−4

Thanks for the reply Gunnar. I used the parametric curve 2D but what expressions should i write in the x and y to have a circle. I used the expression r*cos(range(0,0.01,2*pi)) and r*sin(range(0,0.01,2*pi)) for the x and y but the range function does not work it is giving the message of unknown function or operator range.....


The x and y fields expect expressions defined in terms of a parameter. Try the following:

Name: s
Minimum: 0
Maximum: 2*pi
x: r*cos(s)
y: r*sin(s)


[QUOTE] Thanks for the reply Gunnar. I used the parametric curve 2D but what expressions should i write in the x and y to have a circle. I used the expression r*cos(range(0,0.01,2*pi)) and r*sin(range(0,0.01,2*pi)) for the x and y but the range function does not work it is giving the message of unknown function or operator range..... [/QUOTE] The x and y fields expect expressions defined in terms of a parameter. Try the following: Name: s Minimum: 0 Maximum: 2*pi x: r*cos(s) y: r*sin(s)
Aamir Qamar
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Posted: 9 years ago 14 sept. 2015, 21:58 UTC−4
Thanks i got your point. I tried but it is giving the message
Cannot evaluate the expression
Failed to evaluate variable.
- Variable: s
- Geometry: 1
- Boundary: 1 2 4 5 7 8 9 15 53 54 67 77 79 98 99
Failed to evaluate expression.
- Expression: cos(s)
- Plot: previewplot1 (Line)
Thanks i got your point. I tried but it is giving the message Cannot evaluate the expression Failed to evaluate variable. - Variable: s - Geometry: 1 - Boundary: 1 2 4 5 7 8 9 15 53 54 67 77 79 98 99 Failed to evaluate expression. - Expression: cos(s) - Plot: previewplot1 (Line)
Aamir Qamar
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Posted: 9 years ago 14 sept. 2015, 22:01 UTC−4
thanks it worked.... thanks alot for the information....
thanks it worked.... thanks alot for the information....

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