format long does NOT tell you every single digit in the number!!!!
format long does NOT tell you every single digit in the number!!!!
format long does NOT tell you every single digit in the number!!!!
There, I've said it three times, so it must be true.
format long
X = pi
Y = X - 3.e-16
Do they appear to be identical? Yes. Down to the last digit, I think. At least, format long tells me so. But are they?
X == Y
Numbers are stored with a 52 bit mantissa in MATLAB. However, 52 binary bits is how many decimal digits? There is not an integer relationship between binary bits and decimal digits. So while format long gives you DECIMAL digits, you don't see the exact bits.
