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Help with Matrix Summations

2 次查看（过去 30 天）
Peter cullen
Peter cullen 2014-1-27
关闭： MATLAB Answer Bot 2021-8-20
Hi,
Below is an output from matlab. I wish to combine this into one matrix & add the three last terms of each elg_nl to the first three in the next elg_nl. How can this be done? The required solution is shown. I may also have more than 3 elg_nl, would I require a loop??
>> elg_nl
elg_nl(:,:,1) =
0
0
0
-6
-3
1
elg_nl(:,:,2) =
-5.0000
0.0000
7.5000
-5.0000
0.0000
7.5000
elg_nl(:,:,3) =
-6
-3
1
0
0
0
>> expected result (12x1matrix)
0
0
0
-11.0000
-3.0000
8.5000
-11.0000
-3.0000
8.5000
0
0
0
Please help, thanks

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回答（2 个）

Matt J
Matt J 2014-1-27
sum(elg_nl,3)
will produce the middle 6 elements you want. I don't know by what you rule you want it extended to 12x1, unless it's just zero padding.
  2 个评论
Peter cullen
Peter cullen 2014-1-27
Thanks, I am trying to create a finite element code for a portal frame. The zeros indicate zero force at certain nodes and therefore are required. Any other ideas?
Matt J
Matt J 2014-1-27
编辑：Matt J 2014-1-27
No other ideas are required for any apparent reason. I've given you what you requested, as far as I can tell. I don't imagine you need help padding with zeros, if that's the only missing piece.
Amit
Amit 2014-1-27
eigen_nl_expected = [eigen_nl(:,:,1);eigen_nl(:,:,3)]
eigen_nl_expected(4:9) = eigen_nl_expected(4:9) + eigen_nl(:,:,2);

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