elseif using specific sets

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Dave
Dave 2014-11-4
回答： Dave 2014-11-4
Hello, I need to evaluate a function for specific sets, ideally don't want to evalute the function for all sets so once it is above the condition to stop. I try to use the "elseif" statement but it never actually enters the elseif and terminates, even though it should enter.
Example
xa=[1 2] ; xb=[0 1] ; xc=[-1 4]; xd=[4 7]; xe=[10 10]; xf=[0 0];
y=xa(1)+xa(2)
if y<10
y=xb(1)+xb(2)
elseif y<10
y=xc(1)+xc(2)
elseif y<10
y=xd(1)+xd(2)
elseif y<10
y=xe(1)+xe(2)
else
y=xf(1)+xf(2)
end
Above, in the "xa" case, y=3 so it enters the if statament, evaluates the "xb" case and gets y=1 so it should enter the elseif of case "xc", but it terminates.
In this example, I need the final y to be the case xd so y=11. This is the first instance the criterion is not satisfied.
Do you know what I'm doing wrong and how to fix it? Thanks

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Dave
Dave 2014-11-4
I'll use "while" instead, thanks though
X=[1 2; 0 1; -1 4; 4 7; 10 10; 0 0]
ii=1
y=1e-10
while y<10
y=X(ii,1)+X(ii,2)
ii=ii+1
end

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