MATLAB: Is this if statement does not work

errorfloating pointif statementloop

if (oval1x ~= sObjVal1(1) || oval1x ~= sObjVal1(end))
    cd=1;
else
    cd=Inf;
end

it happened that oval1x=4.2139; and sObjVal1(1)=4.2139; but the loop did not work correctly

Edit: is there a way to correct this issue?

Best Answer

Because they are float numbers, reading the below links might help you better about floating numbers:

https://www.mathworks.com/help/matlab/matlab_prog/floating-point-numbers.html

You could add tolerance to satisfy the conditions , search inside the forum with the tag "floating point" you would find lots of explanations about it.

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Rounding error. Try something like this:

m1=1;
while m1 < 4.80
    m1=round(m1+0.1, 2);  %To prevent m1 from drifting too far due to rounding error
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% CASE 2
m2=1;
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When you use S.obj1 then it needs to do structure expansion [S(1).obj1, S(2).obj1, S(3).obj1, ... S(end).obj1)] and that is where the horzcat comes from. If you had used S(1).obj1 then horzcat would not have been invoked because there would be no structure expansion.

When there is only one object in the structure it does seem to be a waste to go through structure expansion. I do not know if there is some subtle reason that it must do so, but that is what appears to be happening.

Best Answer

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