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Apparently, 1e-4 (it shouldn't have any spaces) is a numerical literal
in Lua 5.3, where it is close to 1 * 10^-4, though at least in my Lua
1e-4 is not quite equal to 1 * 10^-4, because the former is roughly
0.000100000000000000004792173602 and the latter is roughly
0.000100000000000000045449755071 .
It is apparently not a valid number in Lua 5.1 though, where I get a
syntax error "unexpected symbol near 1e-4". So maybe you're using Lua
5.1, not 5.3?
1e - 4 (with spaces around the hyphen) is invalid syntax in both Lua
5.3 and 5.1: "malformed number near '1e' ".
— Gabriel
On Sun, Nov 4, 2018 at 11:43 PM Luke <lemmett81@gmail.com> wrote:
>
> Hi,
>
> I'm not getting some of the examples in the slides
>
> t = table.pack(1, nil, 3)
> for i = 1, t.n do
> print(t[i])
> end
>
> Does t.n give the value of' 3?
>
> for k, v in pairs(tab) do
>
> What does in do in this line of code?
>
> function derivative(f, dx)
> dx = dx or 1e - 4
> return
> function (x)
> return(f(x + dx) - f(x)) / dx
> end
> end
>
> I get an error message running this, from the lecture'"more on function".
>
> Do resources like this mean I might one day use CSound in lua
> interpreted by C++ without knowing C?
>
> github.com/csound/csoundAPI_examples/tree/master/lua
>
> Cheers,
> Luke
>