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Rank Deficient Problem 2.40 An engineer's guide to matlab.
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Hora91  
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 More options Feb 10, 7:59 pm
Newsgroups: comp.soft-sys.matlab
From: "Hora91 " <horacioator...@hotmail.com>
Date: Sat, 11 Feb 2012 00:59:12 +0000 (UTC)
Local: Fri, Feb 10 2012 7:59 pm
Subject: Rank Deficient Problem 2.40 An engineer's guide to matlab.
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Basically i have to find the hoop stress.

v1=.4;
v2=.4;
E1=2.1*10^9;
E2=.21*10^9;
U0=.25;
a=5;
b=6.4;
c=8;
k=[1,a^2,0,0;1,b^2,-1,-b^2;-(1+v1),(1-v1)*b^2,(1+v2)*E1/E2,-(1-v2)*(b^2)*E1 /E2;0,0,-(1+v2),(1-v2)*c^2]
j=[0;0;0;-U0*E2*c]
[K,J]=meshgrid(k,j)
y=K/J

I should be getting the values with which i am going to calculate the hoop stress, but the values im getting do not make sense. Im getting warning Rank Deficient 1


 
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Steven_Lord  
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 More options Feb 13, 10:16 am
Newsgroups: comp.soft-sys.matlab
From: "Steven_Lord" <sl...@mathworks.com>
Date: Mon, 13 Feb 2012 10:16:36 -0500
Local: Mon, Feb 13 2012 10:16 am
Subject: Re: Rank Deficient Problem 2.40 An engineer's guide to matlab.
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"Hora91 " <horacioator...@hotmail.com> wrote in message

news:jh4eh0$jfp$1@newscl01ah.mathworks.com...

Even discounting the fact that meshgrid accepts grid _vectors_ and you're
passing in a grid _matrix_ as k (and I don't know why you're doing that) K
is in fact rank-deficient; it only has one linearly independent row. All the
rest of the rows are simply one times that row.

Are you sure you're not just supposed to use y = k\j?

--
Steve Lord
sl...@mathworks.com
To contact Technical Support use the Contact Us link on
http://www.mathworks.com


 
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