How to give if...then condition ?

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Urvi
Urvi 2012-10-17
How can I give a condition statement for the following case:
for A1<=A,
e=0
for A1>A,
e=5e-03
Now, I want to use this e value (after A1>A) to calculate a new value of e at the next time instant. Say, the formula for e is,
e = v/[u/e - 2] (e on the RHS is the value of e at the previous time step and the e on LHS is the new value which I want)
How can I form a condition for the above case??
Thanks!!
  1 个评论
Matt Fig
Matt Fig 2012-10-18
编辑：Matt Fig 2012-10-18
You need to learn the difference between FOR and IF:
doc for
doc if
Once you have this difference clear in your mind, you should be able to formulate your question more clearly.

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-17
e=5e-03
if A1<=A,
e=0
else
e = v/[u/e - 2]
end
  15 个评论
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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-19
编辑：Azzi Abdelmalek 2012-10-19
function dy=equation(t,y)
global b1 b2 b3 c y1 yy
dy=zeros(3,1);
if y(1)>b2
b1=0.001;
end
b1=b1+1-exp(-b3);
b2=b1-y(1);
b3=b1+b2+y(2);
dy(1)=-b1*y(1);
dy(2)=b3*y(1)+b2*y(2);
dy(3)=sqrt(b1)+y(1)+y(3);
c=[c;t b1 b2 b3] ;

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Sachin Ganjare
Sachin Ganjare 2012-10-18
if A1<=A
e= 0;
elseif A1>A
e = 5e-3;
end
e= v/(u/e_prev - 2);
e_prev = e;
Hope it helps!!!
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Azzi Abdelmalek
Azzi Abdelmalek 2012-10-19
Urvi, Can you post your code?
Urvi
Urvi 2012-10-19
ya I just did..thank you.

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