If statement with two conditions

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Amos Agbetile 2019-2-13

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https://ww2.mathworks.cn/matlabcentral/answers/444756-if-statement-with-two-conditions

评论： Amos Agbetile 2019-2-13

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Hello everyone, once again.

Please I need a fix for this code, I get the same answer for each condition.

function out = select(condition, a, b)
if a > b == condition
    out = a;
else
    out = b;
end

How can I fix this?

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Guillaume 2019-2-13

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Yes, as Adam said, the comments don't make sense, and it's very unclear what you're trying to achieve. Your current code is exactly equivalent to:

if condition
    if a > b
        out = a;
    else
        out = b;
    end
else
    if ~(a > b)
        out = a;
    else
        out = b;
    end
end

assuming condition, a, and b are scalars (if they're vectors the whole logic is a lot more complicated). Whether or not, it's what you wanted to achieve is unknown.

I get the same answer for each condition

No, you will get a different result for condition = true than for condition = false (or 0 or 1), unless a and b are equal of course.

Note that if either of a, b or condition are vectors, then vector rules apply to if and yes, it's very likely the if is always false.

Amos Agbetile 2019-2-13