Indexing a value from a vector
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I have a for loop where I need to index the vector element when the value exceeds 120, and display the number of iterations it took to reach that value. Can anyone help me? My code:
n=100;
p(1)=14.7;
for i=2:n-1
p(i)=((patm*v1+p(i-1)*vtire)/(v2+vtire));
end
pg=p-patm
and of course all these variable are defined earlier in the script
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回答（2 个）
Wayne King
2013-10-3
编辑：Wayne King
2013-10-3
If you don't know the number of iterations in advance, why use a for loop?
Here, I'll test when any element of p goes negative and the looking at the length of the vector, you'll know it occured in the length-1.
n = 2;
p(1) = 14.7;
while all(p>0)
p(n) = p(n-1)-0.01;
n = n+1;
end
length(p)
Azzi Abdelmalek
2013-10-3
编辑：Azzi Abdelmalek
2013-10-3
n=100;
p(1)=14.7;
for i=2:n-1
p(i)=((patm*v1+p(i-1)*vtire)/(v2+vtire));
end
pg=p-patm
idx=find(p>=120)
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2021-8-20
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