How to get a logarithm of a number?

[genius12]

What is it you are trying to achieve?

I am trying to get turing to find the logarithm of a number. I thought that there would probably be a function for logarithms in Turing but there isn't, or
atleast I didn't find one.


What is the problem you are having?
I can't find a function or a way to get the logarithm of a number.


Describe what you have tried to solve this problem
I have tried finding a function of method to find the logarithm of a number but was unsuccessful.


Please specify what version of Turing you are using
4.1.1

[Zren]

Oh wow, Turing doesn't actually have log10, log(x, base) or any of that jazz.

Well, Turing doesn't have a very full arsenal in this reguard, nor will it ever be expanding. It does have the key function Math.ln(x) which will get you the natural logarithm.

Due to some math I can't quite remember, log(x, base) = ln(x) / ln(base). With that we can create our own functions.

Turing:

/**  * Return the natural logarithm of x (to base e).  */ % From the math module (Math.tu) % function ln (r : real) : real /**  * Return the logarithm of x to the given base, calculated as log(x)/log(base)  */ fcn log (x : real, base : real) : real     result ln (x) / ln (base) end log /**  * Return the base-10 logarithm of x.  *  * Notes: Normally this function would be more accurate than log(x, 10).  */ fcn log10 (x : real) : real     result log (x, 10) end log10 put log (8, 2) % 3 put log (1 / 2, 2) % -1 put log10 (1) % 0 put log10 (10) % 1 put log10 (100) % 2 put log10 (1000) % 3 % put log(0,0) % ERROR % put log10 (0) % ERROR

[genius12]

Yup. Well didn't realise that Turing had a natural logarithm function. Thank you for pointing that out.