C++ :: Lagrange Interpolation Formula - Substitute Values Into Power
May 7, 2013
I did a function for lagrange interpolation formula. However i`m stuck on how do i substitute values into the power. Here is my code snippet :
for(int i=1;i<getSecretShare+1;i++) {
//calculateValue=getSecret+(10*p)+(2 * pow(p,2));
int storeThreshold=getThreshold;
calculateValue=getSecret+(10*i)+(2 * pow(i,2));
calculateFinalValue=calculateValue % 17 ;
cout<<"the calculated value is "<<calculateFinalValue<<endl;
}
The formula that i want to implement is that a + a1x^1 + a2x^2 + a(t-1) ^t-1
I have gotten the substitution of the x value out. However, i am stuck on how do i calculate the values according to the threshold which the user keys in. For example if the user keys in 3.
It will into account the no. of shares to generate which is for example 5 in this case, then it will then take into account the threshold keyed in , which is 3, i will then calculate using the formula using the no. of shares and also threshold.
if the threshold is 3 and the number of shares to generate is 5. I should have the following:
the power depends on the threshold which is t-1, 3-1 =2
So I will have to generate two a values based on that and also calculate them according to the power that is dependent on the threshold the first value being to the power of 1 and the 2nd being to the power of 2 if the threshold is 4.
Then I will generate 3 a values and then calculate them :
This program is checking how many times each character appears in a row but it uses string as a source of a text and i want to use a file. I am not very fluent in operating on files, thus my question is what should be change in this program to make it work on files, not only on strings?
I am trying to substitute a variable for the file directory. Here is the error: error: no matching function for call to 'std::basic_ ofstream <char>:: basic_ ofstream(std::string&)'
Main is supposed to be sending values to the power function.Write a prototype and function for calculating powers of numbers.This version should have an integer return type and take two integer inputs, for the base and the exponent. It should do the following:
• handle negative bases • return an error on negative exponents (we’re not doing those yet) • handle zero exponents
Call your function from a nested loop in main(), which calls the function using every combination of negative, zero and positive numbers for both base and exponent. This will test your function without the user having to input all the data.Any code which calls the library pow() function will lose half of the assignment points.
#include <iostream> using namespace std; int power (int, int); int main() { int size = 10; int test[size]; int base;
I am trying to do a compute and output a power set program. The numbers will be input through a file. How to do a power set. Here is my code :
#include <iostream> #include <fstream> #include <string> #include <ostream> using namespace std; int main () { string array[21]; // creates array to hold names
I am trying to create a recursive function that i can call on in order to take a user inputed base and exponent and give final answer this is what i have but im completely lost after this i dont even know how to continue. What i have so far
#include <iostream> using namespace std; int Exp(int x,int y){ if(base <= 1 || exp == 0) return 1; if(exp == 1) return base; int main(){ int number, exp;
[Code] .....
After i set the base situations im not sure how to get the function to make the function take the base to the exponent recursively.
I am using Windows 7 32bit OS and want to detect the CPU power button press event in my console application developing in C language.
I configured the power button setting to "Do Nothing" which is in "Choose what the power button does" options in Control Panel->Hardware and Sound->Power Options. So now i want to detect this power button press event and do some processing in my application then i will initate shut down from application itself. Looking for windows API details which will detect the power button press event.
I need an equation that determines the lowest possible cost for laying power line.
The variables are as follows:
1. The width of a river 2. The distance a factory is downstream from a station on the other side of the river. 3. The cost for laying line underwater. 4. The cost for laying line on land.
All these variables will be user input each use of program.
I have a program I want to write that determines the health of a power transformer. I know the syntax of all the other code I might have to use but I'm not too sure of how to make it fit into a graphic interface like you see in any other windows program.
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Equation for compound interest. The interest is supposed to be $43.34 according to the book, I am ending up with around $35. The actual equation is amount = principal * (1 + rate/t)^t where t = number of times compounded per year. I still have to go through and clean up all the code I just want the formula working first.
#include <iostream> #include <iomanip> #include <cmath> using namespace std; int main () { float princ, rate, comp, savings, interest, rates, year;
We are suppose to build a program to do the quadratic formula, which isnt really a issue. my issue is i have a if else loop and my if is being ignored.
note: i know that i can use the i number system but we have been asked to not too and to do this instead.
here is my code
#include <stdio.h> #include <math.h> int main() { float a, b, c, d, e, f, g, h, i; /* i would love to figure out a way to do this without so many variables*/
I need to calculate the area of a triangle using heron's formula. I wrote the code below and i need to modify it so that a user is required to keep entering the three side until he/she decides to stop. If the three sides entered make an invalid triangle, the user is required to re-enter the values until valid triangle is formed. Then the area is displayed.
#include <iostream> #include <cmath> using namespace std; int main(){ double a,b,c=0; double s,A=0;
[Code] .....
the screen output should like this:
Enter three sides of a triangle: 0 1 2 Error! Re-enter three sides of a triangle: -1 1 2 Error! Re-enter three sides of a triangle: 3 4 5 => 6
Continue (y/n)? y
Enter three sides of a triangle: 1 1 2 Error! Re-enter three sides of a triangle: 6 8 10 => 24
Continue (y/n)? n
Done!
Please note that Continue (y/n)? only displayed after a valid triangle is formed. Otherwise, the user needs to re-enter sides until it's valid.
write codes that could solve a quadratic formula, and my codes are like this:
#include <bjarne/std_lib_facilities.h> int main() { cout << "Enter the coefficients of a quadratic polynomial a*x**2 + b*x +c: "; cout << " a? "; double a; cin >> a; cout << " b? ";
[code]....
Which runs perfectly, but I have 2 questions:
1. How to simplify these code? On the assignment sheet the professor wrote about using void solve_linear(double b, double c); and void solve_ quadratic (double a, double b, double c);which I currently dont understand how these works. He asked us to write a well-encapsulated (as short as possible) program.
2. These are for extra points: the precision problem of floating numbers: professor asked us to find a way to get the precise answer of it, like this: Enter the coefficients of a quadratic polynomial a*x**2 + b*x +c: a? 1 b? -20000 c? 1.5e-9 Trying to solve the quadratic equation 1*x*x + -20000*x + 1.5e-09 == 0 Using classical formula: Two roots, x = 20000 and x = 0 Using stable formula: Two roots, x = 20000 and x = 7.5e-14
My guess is that A. Using code like if(x1*x2=a/c) to check if numbers were approximated. B. Somehow determine the larger one in x1 and x2. C. Somehow use that larger one to do something
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Code: #include <stdio.h> #include <math.h> #define PI 3.14159265 double equation(int n); int
