Hello,

What is the best way to determine if a float number `b`

is an integer multiple of another float number `a`

, (i.e. `b = k a`

with `k`

an integer)? I wanted to use the following test

`abs(mod(b, a))<1e-12`

, but I am confused with the behavior of the `mod`

routine:

```
@show mod(2*0.1, 0.1), mod(3*0.1, 0.1), mod(5*0.1, 0.1), mod(8*0.1, 0.1), mod(9*0.1, 0.1)
```

Output:

```
(0.0, 2.7755575615628914e-17, 0.09999999999999998, 0.0, 0.09999999999999998)
```

Aren’t we supposed to get `0`

for all these results (up to machine precision)? I would appreciate your help for a more robust test.