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[Solved] -- Geometry Creation using a LOOP
Posted 04.06.2010, 10:31 GMT-4 API, Geometry 6 Replies
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I am attempting to create a 2nd order Bezier curve using a Matlab script file. The number of points that I would like to process are extraordinary on the order of 500 - 1000; maybe even more. My data is set up in a text file that I can import into matlab using the load command. I have inserted what code I currently have below. When I run this in comsol it only outputs the last curve: named CO495. How can i get all the curves to be on the same plot? i.e. CO1 to CO495?
Thank you for your help!
Markthomas
%******************Start of M-file***********************
%Load Data
load 'Coord.txt'
x = Coord(:,1);
y = Coord(:,2);
%Initial Conditions
i = 1; j = 2; k = 3;
% Geometry objects
clear s
while k<=length(x)
% Geometry
carr=curve2([x(i), x(j), x(k)],[y(i),y(j),y(k)],[1,0.52,1]);
g4=geomcoerce('curve',carr);
s.objs={g4};
s.name={['CO' num2str(i)]};
s.tags={'g4'};
fem.draw=struct('s',s);
fem.sdim = {'x','y'};
fem.frame = {'ref'};
i = i+2; j = j+2; k = k+2;
end
Thank you for your help!
Markthomas
%******************Start of M-file***********************
%Load Data
load 'Coord.txt'
x = Coord(:,1);
y = Coord(:,2);
%Initial Conditions
i = 1; j = 2; k = 3;
% Geometry objects
clear s
while k<=length(x)
% Geometry
carr=curve2([x(i), x(j), x(k)],[y(i),y(j),y(k)],[1,0.52,1]);
g4=geomcoerce('curve',carr);
s.objs={g4};
s.name={['CO' num2str(i)]};
s.tags={'g4'};
fem.draw=struct('s',s);
fem.sdim = {'x','y'};
fem.frame = {'ref'};
i = i+2; j = j+2; k = k+2;
end
6 Replies Last Post 18.04.2011, 09:42 GMT-4
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Posted:
1 decade ago
Hi
Ido not have comsol and matlab here from home, but shouldnt you index these too:
g4=geomcoerce('curve',carr);
s.objs={g4};
s.name={['CO' num2str(i)]};
s.tags={'g4'};
for me I read only 1 item, and if you go through all its only the "last one" remaining.
If you make a complex geoemtry with 2-3 or more items, COSMOL stores g1 g2 g3 g4 ... and the name list contains all names
check it out
Have fun Comsoling
Ivar
Ido not have comsol and matlab here from home, but shouldnt you index these too:
g4=geomcoerce('curve',carr);
s.objs={g4};
s.name={['CO' num2str(i)]};
s.tags={'g4'};
for me I read only 1 item, and if you go through all its only the "last one" remaining.
If you make a complex geoemtry with 2-3 or more items, COSMOL stores g1 g2 g3 g4 ... and the name list contains all names
check it out
Have fun Comsoling
Ivar
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Posted:
1 decade ago
I tried to index the following as:
g(i)=geomcoerce('curve',carr);
s.objs={g(i)};
s.name={['CO' num2str(i)]};
s.tags={'g(i)'};
but COMSOL doesn't like that... I am not sure of a way to index variable names i.e.
g1...g500
Do you know how to do this?
g(i)=geomcoerce('curve',carr);
s.objs={g(i)};
s.name={['CO' num2str(i)]};
s.tags={'g(i)'};
but COMSOL doesn't like that... I am not sure of a way to index variable names i.e.
g1...g500
Do you know how to do this?
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Posted:
1 decade ago
Hi
not like that (I have no direct access to COMSOL from home), but really make a geometry from the GUI interface and save as a M file or just analyse your history.m file, and compare.
Then check that the naming is the same w.r.t. chr and ' '
Good luck
Ivar
not like that (I have no direct access to COMSOL from home), but really make a geometry from the GUI interface and save as a M file or just analyse your history.m file, and compare.
Then check that the naming is the same w.r.t. chr and ' '
Good luck
Ivar
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Posted:
1 decade ago
I figured out how to create a geometry using a loop (while loop or for loop) in COMSOL/MATLAB... It finally occurred to me what I had to do... I guess I am a little out of practice! Thank you for your help!
Markthomas
Markthomas
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Posted:
1 decade ago
I figured out how to create a geometry using a loop ...
So let us know, please!
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Posted:
1 decade ago
Hi,
1) I have an arc that form my 2-D geometry. I also have an array of straight lines(y=constant) that cut my arc splitting into multiple arcs.
2) I need to move my multiple arcs to different positions.
3) So i select the arc to be moved.
4) Now I need to access the index of the array of straight line that is nearest to this arc.
5) So, I need to loop through the existing array and extract the y-coordinate of this straight line from the array.
6) Then retrieve the min y-position of the arc selected for moving.
7) Use if condition to check if y of line exceeds y of the appropriate arc.
8) Based on the above comparison, decide where to place my arc.
9) The displacement through which I take the arc will have the array index that is to be retrieved in 4.
I do not expect an exact solution to the problem but would be glad even if I can get hints on
a) how to access the index of an array of geometric object.
b) how to write if condition
c) how to write for loop
Note: I am flexible to choose between 3.5 and 4.1 or even integrating matlab with comsol if necessary though I have never tried it before.
1) I have an arc that form my 2-D geometry. I also have an array of straight lines(y=constant) that cut my arc splitting into multiple arcs.
2) I need to move my multiple arcs to different positions.
3) So i select the arc to be moved.
4) Now I need to access the index of the array of straight line that is nearest to this arc.
5) So, I need to loop through the existing array and extract the y-coordinate of this straight line from the array.
6) Then retrieve the min y-position of the arc selected for moving.
7) Use if condition to check if y of line exceeds y of the appropriate arc.
8) Based on the above comparison, decide where to place my arc.
9) The displacement through which I take the arc will have the array index that is to be retrieved in 4.
I do not expect an exact solution to the problem but would be glad even if I can get hints on
a) how to access the index of an array of geometric object.
b) how to write if condition
c) how to write for loop
Note: I am flexible to choose between 3.5 and 4.1 or even integrating matlab with comsol if necessary though I have never tried it before.