Getting wrong results while calling a function.

I have written a simple function. It takes two inputs, only when two inputs are equal the output should be zero.

function I = getI(E,Eg)

if (E<=1.5) && (E ~= Eg)
 I=(500*E)/1.5;
elseif (E>1.5) && (E<=4) && (E ~= Eg)
 I=500*(1-((E-1.5)/(4-1.5)));
elseif (E==Eg)
 I=0;
end

end

Now the function works as expected most of times,but when the value of Eg is 1.38,1.39,1.4, 2.84 or 2.6 the code doesnot gives I=0 even when the value of Eg is equal to E. Example:

I tried changing the if conditions, changing their positions. No change.

Answer 1

[Rik]

Some numbers cannot be represented exactly in binary. You will either need to round both numbers to make sure they have the exact same representation, or compare the differences to a tolerance.

[Asif Rahman]

Shouldn't this show wrong result also?

If not than can you please guide me about a different approach. Thanks.

[Rik]

This shows the correct result, because the numbers are generated the same way.

If a number can't be represented exactly by a double, it might be represented slightly differently if the method of calculation is different, e.g. writing 1.4 directly and using the colon operator.