Drexel dragonThe Math ForumDonate to the Math Forum



Search All of the Math Forum:

Views expressed in these public forums are not endorsed by Drexel University or The Math Forum.


Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: data extraction from matrix to use in another matrix
Replies: 26   Last Post: Oct 22, 2013 4:57 PM

Advanced Search

Back to Topic List Back to Topic List Jump to Tree View Jump to Tree View   Messages: [ Previous | Next ]
walter Mulvany

Posts: 14
Registered: 10/19/13
Re: data extraction from matrix to use in another matrix
Posted: Oct 21, 2013 6:10 PM
  Click to see the message monospaced in plain text Plain Text   Click to reply to this topic Reply

I think that this problem is about indexing, and I don't think that I have done a good job explaining what I need to do.
This program is about finite element analysis of a bar element, and I have to input a number of nodes that have x,y coordinates, a number of member that have a connectivity between those nodes ( node a to node b or just columns 2 and 3 in matrix conn). Example, element 1 goes from node 5 to node 2, element 11 goes from node 6 to node 7.

What I need to do is to go to element 1, read the value of (conn - row 2) which is 5, go to the coord matrix, find the value (5) in its row 1 and extract the x value that correspond to that location (5) from (conn - row 2) which in this case is (1).

Those values can be stored in a matrix, lets call it M as you named it.
I think that the confusion came because I had the other matrices nodeax and nodeay and you probably thought that they existed as part of the input but I just put it there to show how the matrix with the coordinates look like.

conn=[1,5,2;2,2,3;3,3,4;4,4,7;5,3,7;6,3,6;7,6,2;8,5,2;9,1,5;10,5,6;11,6,7];
disp ('Elem # Node(a) Node(b)')
disp(conn)
coord=[1,0,0;2,2,0;3,4,0;4,6,0;5,1,1;6,3,1,;7,5,1];
disp ('Node # Xcoord Ycoord')
disp(coord)
M=zeros(length(conn),4);
for i=1:length(conn),
M(i,:)=[conn(i,:) conn(find(conn(:,1)==conn(i,1)),:)];
end

I apologize for all the confusion and I appreciate you effort.
Thanks.
Let me know if you need any additional information.


Date Subject Author
10/19/13
Read data extraction from matrix to use in another matrix
walter Mulvany
10/19/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/19/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/19/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/19/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/20/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/20/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/20/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/20/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/21/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/21/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/21/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/21/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/21/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/21/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/22/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/22/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/22/13
Read Re: data extraction from matrix to use in another matrix
walter Mulvany
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/22/13
Read Re: data extraction from matrix to use in another matrix
dpb
10/20/13
Read Re: data extraction from matrix to use in another matrix
dpb

Point your RSS reader here for a feed of the latest messages in this topic.

[Privacy Policy] [Terms of Use]

© Drexel University 1994-2014. All Rights Reserved.
The Math Forum is a research and educational enterprise of the Drexel University School of Education.