formula

  1. J

    How to describe this in a formula?

    I want to put the following in a formula, how can I do that? Set A has numbers ranging from 1 till 10. The numbers in Set B depend on the number at Set A multiplied by 3. (So if A=1 then B=3) (if A=5 then B=15) (if A=10 then B=30)
  2. J

    What does this function mathematically do?

    On the website: https://chrisalbon.com/machine_learning/trees_and_forests/handle_imbalanced_classes_in_random_forests/ There is the following explanation: wherein classes are automatically weighted inversely proportional to how frequently they appear in the data. Specifically $w_j =...
  3. A

    Calculate return on investment (excel formula)?

    Hello everyone, I'm a bit stumped on this one. Assuming I have the following cells: A1: original deposit A2: the interest rate (%) A3: the duration in days which the interest rates applied to A4: days invested How can I calculate the total return (including the original deposit)...
  4. M

    can anyone knows the formula for these variables ?

    I had these variables in my calculations and I can't find there formula ! thanks
  5. N

    equation formula

    Hi. You guys know how to calculate (formula) these ones? I'm studying by myself, so I don't get any teacher help. (k-3) – (5-3k) = 2(k+1) should it continue like this... (answer is k = 5) k - 3 - 5 - 3k = 2k + 2 and how about this second one? (answer x = 6) x/2 – (x-1)/5 = 2 :p
  6. M

    what's the formula for this set ?

    I need to know the formula which gives these variables ! 2, 12, 24, 37.8947368, 53.333, 70.0811111, 87.9709414
  7. J

    how do I write this formula in latex?

    I want to write the formula below in latex, but how can I write this in latex? Where abs mean absolute value of numeric data. mean(abs(a-b))/mean(abs(a))
  8. N

    Proof of sample variance formula

    This formula should be checked for i+1: s_{i}^2= \frac{1}{i-1}\sum\limits_{k=1}^{i} (x_k-\bar{x}_i)^2 The result should be this: s_{i+1}^2=\left(1-\frac{1}{i}\right)s_{i}^2+(i+1)(\bar{x}_{i+1}-\bar{x}_{i})^2 Assumed as known, this is...
  9. E

    How to derive a formula

    Greetings to all! Please tell me how you can derive this formula to get (F - N) = .... or A = .... ((B * E * N) - (C * E * L) + (E * L * Z) - (F * L * S)) All values are known except F =? N =? The value of A is known (F - N) = A
  10. J

    squared error minimization formula semplification

    Hello, it's my first post here. I am studying some Computer Vision and I found myself back in linear algebra. I gave this exam something like 10 years ago and I find some difficulties. Probably something basic. In the following video (exact second) the guy is explaining that he wants to...
  11. R

    Generalization of Riemann-weil formula for arithmetic functions

    \sum_{n=1}^{\infty} \frac{\mu(n)}{\sqrt{n}}g(\log n)=\sum_{\gamma}\frac{h( \gamma)}{\zeta '( \rho )}+\sum_{n=1}^{\infty} \frac{1}{\zeta ' (-2n)} \int_{-\infty}^{\infty}dxg(x)e^{-(2n+1/2)x} </math> \sum_{n=1}^{\infty} \frac{\lambda(n)}{\sqrt{n}}g(\log n) = \sum_{\gamma}\frac{h( \gamma)\zeta(2...
  12. S

    A function out of the matrix?

    Hi everyone. I have a table of relations between various foods (each with each). Maybe that could be defined as a matrix. Here is a small 4 x 4 example: Rice Soup Ice cream Salad Rice 0 1 2 1 Soup 1 0 2 2 Ice cream 2 2 0 2 Salad 1 2 2 0 (The higher the...
  13. G

    Why 2nd formula of C.I is used?

    Value of X, Ram invested Rs 6400 on compound interest at the rate of X% and gets an amount of Rs 8464 as interest after 2 yrs. Quantity II → A/P = (1+ R/100)^n → √(8464/6400) = (1+ R/100)^n → 23/20 = 1 + R/100 → R = 15% There are C.I formulas: C.I = P([1 + R/100]^n – 1); A = P...
  14. M

    in need of a formula asap

    Hi, I am for all intents and purposes New here, I have an issue where I am designing and making a full scale guillotine prop. My question is taking gravity as the driving force of one object in motion, how far from a dead switch would the second moveable object have to be to fall at the same...
  15. G

    What is the proper formula for Max height & Ymax for this trajectory?

    Trajectory: Time it takes from A to travel to B; T = \large\frac{Vsinθ}{g} Time it takes for for B to travel to C; T = \large\sqrt\frac{2y_{max}}{g} Then what is the formula for Max height & Y_{max}?
  16. L

    Struggling to make n the subject of the formula?

    Hi there, Wondering if anyone can help me find the answer the this algebra problem: Make n the subject of the formula: J = nE/(nL+m) been racking my brains on this one, any help greatly appreciated. Thanks, Craig
  17. K

    Making a formula that finds the horizontal and vertical distance between two points t

    I am making a Scratch 3.0 game. The shooter sprite is holding a gun slightly off-centre (see images), and I need the bullet to go to the end of the barrel of the gun before travelling forward (as so it would appear the bullet it leaving the gun). The issue is, to do this, I need to find the X...
  18. M

    General Formula Assistance

    Hi Guys Just signed up searching the forums to see if anybody else has come across this but haven't had any luck so was wondering if anybody could assist. I've checked google searches, facebook, etc., but no luck. I have been working on a few different assignments / queries that have been...
  19. S

    Formula for investment calculator

    Hi, I really need some help in creating a formula for an investment calculator for the table image below. I would be very greatful if you could help. I would like to work out a formula for a yearly lump sum over 10 years & 9% interest every year, but at year 1 there is a premium which is -total...
  20. B

    Finding Values of the Mean using Static Values with only Means - What is the formula?

    Hey, So I have a question about finding values that make up an average. In the example below each number is an average of three values. in the example below I will explain how the averages are made up. As you can see each A - M is a given mean of three values. The last two values in the mean...