How to write this math formula in Blueprints?

[Apollo1444]

Hi guys!
Can you please help me to express these 2 math formulas in Blueprints? I just don’t understand them, no idea how to do it :((
(They’re from old gamasutra article on clicker games: https://www.gamasutra.com/blogs/Anth…mes_Part_I.php )

While putting all this together, I derived two very useful formulas that will save you from brute-forcing with some lengthy for-loops. The first will calculate the cost of bulk-buying generators, the second will calculate the max generators you can buy with your current funds. These will only work for simple exponential growth that doesn’t have shifting costs or exponents, so make sure your particular application works for it. For both of these, the variables are:

$n$ = the number of generators to buy
$b$ = the base price
$r$ = the price growth rate exponent
$k$ = the number of generators currently owned
$c$ = the amount of currency owned

Formula 1:
$cost = b * \frac{r^k(r^n-1)}{r-1}$

Formula 2:
$max = floor(log_r(\frac{c(r-1)}{b(r^k)}+1))$

Many thanks!

[xnihil0zer0]

For future reference, that page says those formulas are in MathJax. If you go to this page and paste them, it will convert them to something more readable.

In a Blueprint, right click and search for “Add Math Expression…” Here are the operations/functions it supports
If you paste an expression into the name or expression fields of this new node, it will automatically assign inputs and build the appropriate blueprint graph. You can double click on the expression node to see its structure.

the expression:
b*(power(r,k)*power(r,n)-1)/(r-1)
will output cost from formula 1

the expression:
floor(log(c*(r-1)/b*(power(r,k))+1,r))
will output max from formula 2.

[Apollo1444]

@xnihil0zer0

For future reference, that page says those formulas are in MathJax. If you go to this page and paste them, it will convert them to something more readable.

In a Blueprint, right click and search for “Add Math Expression…” Here are the operations/functions it supports
If you paste an expression into the name or expression fields of this new node, it will automatically assign inputs and build the appropriate blueprint graph. You can double click on the expression node to see its structure.

the expression:
b*(power(r,k)*power(r,n)-1)/(r-1)
will output cost from formula 1

the expression:
floor(log(c*(r-1)/b*(power(r,k))+1,r))
will output max from formula 2.

Thanks, man! Perfect answer!!
I’ve just modified suggested expressions for UE4 a little bit, and they’re working fine!
b * (((power(r, k)) * ((power(r, n)) - 1)) / (r - 1))
floor((log((((c * (r - 1)) / (b * (power(r, k)))) + 1), r)))