Why is this if statement does not work?

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?

Answer 1

[madhan ravi]

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.

[Cantor Set]

I don't understand

[madhan ravi]

because maybe oval1x is not exactly 4.2139 if you use sprintf('%.32f',oval1x) you could see that its not exactly the same value as you think.

An example to illustrate:

>> x = 1.24213

x =

    1.2421

>> x == 1.2421 % false

ans =

  logical

   0

>> (x - 1.2421) < 1e-4 % true where 1e-4 is the tolerance

ans =

  logical

   1

>>