C++ :: Computational Calculations - Numerically Solve Quantum Harmonic Oscillator
Apr 20, 2012
My task I am trying to accomplish is write a program for C++ that numerically solves a quantum harmonic oscillator. I have a routine that I am trying to implement into this program that iterates through a matrix and finds it eigenvalues, however, I do not know how to put it all together to make it work. Code is below:
Code:
//Compiler flags and numerical constants
#include <iostream>
#include <math.h>
#define L 10.0
#define N 200
using namespace std;
[Code] ....
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Feb 9, 2014
I have code working, but that is largely because a vector that I am using as part of a structure that is the first of two elements of a MAP (with the second being an integer that is assigned later) is serving in its original, purely vector form, to fill out a set of selections on a DOS screen (option 1, 2, 3, etc.).
I do use the MAP, because it is a simple means of referencing the integer value using a word that is part of the structure, and is probably appropriate, saving me a search through the vector of words and calling up the value at the same location in the vector of words in a vector of corresponding numerical values. I DO feel that what I'm doing to produce the selection list is something of a "cheat" because I do not know how to access the same data within the structure component of the MAP by simply using a similar numerical reference (e.g. "MAP[1].structure.word", or would that be "MAP.structure.word[1]" ????) to print out the words in the structure in the map as choices on the screen.
I don't want to change or expand the contents of the map, just access and print each one in a simple loop with a number from the loop counter to the left of each word.
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Mar 6, 2014
Overview: I'm creating a code to simulate quantum tunneling current.
I'm getting the code to output data on a spreadsheet file, and it all works except the following part, which are just giving values of 0 all the way down for the entire column.
j_tl=((eV*hbar*k)/(m/c*c))*(1 - R_lr - T_rl);
When I remove the ((eV*hbar*k)/(m/c*c)) part of it, it gives out values for the (1 - R_lr - T_rl) so I presume the problem is in the former. But I'm struggling to think what it could be. The same is happening for j_tr.
Full code here
#include <iostream>
#include <math.h>
#include <fstream>
#include <stdio.h>
using namespace std;
int main() {
double k,q,p,y;
double E; //Electron energy (V)
[code]....
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Feb 3, 2013
I am creating a program that solves the quadratic equation ax^2 + bx +c.
I have this program almost complete except the output of the equation in the function called display_quadratic. I need the program to display the variables a,b,c in the equation ax^2 + bx + c but I am having 2 problems. My first problem is that I cannot get the right addition and subtraction signs for the equation.
For instance, if the program had the values for a,b,c as 2,2,3
it will display 2x^2 2x 3
How can I get it to display 2x^2 + 2x + 3? or if it was negative like 2x^2 - 2x - 3?
My next question is how do I get to not display the coefficients that are 1?
I had an if-else statement but no matter what I created it would overlap with another statement and print out twice. Here is the code:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
void display_quadratic (float a, float b, float c);
float root1(float a, float b, float c);
[Code] ......
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Oct 19, 2012
I need to make a program which solove difference between two interested times in format hh:mm i made it but it doesn't give me right answers for all times for example it can't solve times like 23:50 and 0:15 and it says that difference is 23:35 and no 00:25
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Dec 22, 2012
I am using matlab R2o11 in which the programming medium is c++. I am having these variables=
T=373 t0 376
V=0.09 to 1
P=T/V
I just need a result showing ... First it should take T=373 and solve the equation using all volume values. Then it takes another temperature and do the same.
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Aug 1, 2013
#include<iostream.h>
#include<conio.h>
class sum {
int a,b,ans;
public:
void geta() {
cin>>a;
[Code] ....
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Dec 15, 2012
I have a problem: solve the system of equations by the Gauss-Jordan methods with pthreads. I have a big matrix A (for example 2000x2000), so i must solve Ax = b. Before I devide matrix to number of threads and each thread must work only with his peace of matrix.
Code:
#include <iostream>
#include "synchronize.h"
#include <pthread.h>
using namespace std;
typedef struct _ARGS {
int thread_count;
int thread_number;
[Code] .....
I write it on Ubuntu, and when I compile [g++ main.cpp -o main -lpthread -lm] the it works good(for example, if in 1 thread I get time_of_working = 10 sec, on 2 threads time_of_working = 5.4, i.e. about 2 times faster ), if I compile like this [g++ main.cpp -o main -lpthread -lm -O3] it is only 1.2-1.3 times faster.
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Mar 31, 2014
I have a text file that contains values as follows:
2013 05 27 15 52 02.049824 231.401 0.022 49.738
2013 05 27 15 52 02.668822 229.814 0.019 49.738
2013 05 27 15 52 03.283705 228.528 2.599 49.726
2013 05 27 15 52 03.898469 230.140 2.576 49.751
Column1=date, Column2=Month, Column3=Day, Column4=Hour, Column5=Minute, Column6=Seconds, Column7=Voltage(Vrms), Column8=Current(Irms), Column9=Frequency(Hz).
I have to develop a program that will analyse these time-sampled voltage and current measurements over 24 hours and find the total energy used, mean and peak power consumption and Energy used over each hour of the 24 hour period.
How do I go about doing this? I also have to use at least one integration method. The file data contains over 50 thousand lines in the format mentioned above.
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Mar 31, 2014
I have a text file that contains values as follows:
2013 05 27 15 52 02.049824 231.401 0.022 49.738 2013 05 27 15 52 02.668822 229.814 0.019 49.738 2013 05 27 15 52 03.283705 228.528 2.599 49.726 2013 05 27 15 52 03.898469 230.140 2.576 49.751
Column1=date, Column2=Month, Column3=Day, Column4=Hour, Column5=Minute, Column6=Seconds, Column7=Voltage(Vrms), Column8=Current(Irms), Column9=Frequency(Hz).
I have to develop a program that will analyse these time-sampled voltage and current measurements over 24 hours and find the total energy used, mean and peak power consumption and Energy used over each hour of the 24 hour period.
How do I go about doing this? I also need to include at least one numerical integration technique. The file data contains over 50 thousand lines in the format mentioned above.
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Nov 26, 2013
#include <iostream>
#include <cstdio>
#include <fstream>
#include <string>
#include <iomanip>
using namespace std;
const int SZ = 55;
[Code] ....
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Mar 31, 2014
I have a text file that contains values as follows:
2013 05 27 15 52 02.049824 231.401 0.022 49.738
2013 05 27 15 52 02.668822 229.814 0.019 49.738
2013 05 27 15 52 03.283705 228.528 2.599 49.726
2013 05 27 15 52 03.898469 230.140 2.576 49.751
Column1=date, Column2=Month, Column3=Day, Column4=Hour, Column5=Minute, Column6=Seconds, Column7=Voltage(Vrms), Column8=Current(Irms), Column9=Frequency(Hz).
I have to develop a program that will analyse these time-sampled voltage and current measurements over 24 hours and find the total energy used, mean and peak power consumption and Energy used over each hour of the 24 hour period.
How do I go about doing this? The file data contains over 50 thousand lines in the format mentioned above.
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Oct 8, 2014
I have to enhance my BMI program to tell whether the person is at optimal weight, under weight, or overweight and I cannot find the correct calculation. Here is the code I have so far that works for calculating the BMI.
namespace Body_Mass_Index {
public partial class BMI_HW : Form {
public BMI_HW() {
InitializeComponent();
[Code] ....
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Apr 11, 2014
When you execute my code you'll notice the regular pay for the first example will calculate to $500 when it is only supposed to calculate to $400. I'm also having a problem adding up the totals of the regular pay and overtime pay to get a total payroll which is displayed in one cout statement. 95% of my code is correct, I'm just having these two issues. To make it more clear hear is my assignment:
The regular working hour for an employee is 40 hours a week. Sometimes employees work over time. When the employee works 40 or less hours, the regular pay is calculated as number of hours worked times the hourly rate. When the employee works over time i.e. beyond 40 hours then the employee's pay has two components a) regular pay (40 hours X hourly rate), and 2) overtime pay (the overtime hours beyond 40 X time and half of the hourly rate).
void compute(incomeInfo *ptrI, int count) {
for (int i = 0; i<count; i++)
if (ptrI->hours <= 40) {
ptrI->regPay = ptrI->hours * ptrI->hRate;
ptrI++;
[Code] ....
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Dec 25, 2013
My game runs in a while loop, as you can see in the code below. I need a timer, which won't stop this loop or freeze it, but it will wait, until timer is over and executes code without interfering with the while or for loop.
Code:
Code:
#include <iostream>
#include <iomanip>
#include <windows.h>
#include <ctime>
using namespace std;
char *map[25][25];
[Code] ....
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Mar 18, 2015
//complxCalc.cpp//
#include "complx.h"
using namespace std;
ifstream infile ("in.dat");
int main() {
int i = 0;
complx tempComplx;
double d = 4.5;
[Code] ....
//in.dat//
(4,4) (6,7) (2.5, 9.3) (3,8.4) (13, 26.5) (2.2, 3.4)
My plan is to make this a menu driven program, I have already got the program to give the answers but now I want it to give the user choices as well. The first step in this project is to add a menu to the program. The first menu the user sees should ask the user if the program will be taking input from a file or from the user directly via the keyboard. Regardless of option chosen, the user should then be prompted to specify whether a multiplication,subtraction or addition operation should be performed.
If the user originally chose the file input method then the program should proceed to display to the screen the results of those operations on each pair of data elements in the file and terminate. If the user chose to input via the keyboard then the user should be prompted to input the two numbers, perform the operation on those two numbers and display the results to the screen and ask the user which mathematical operation they would like to do next and continue in this manner until the user chooses to exit the program via a menu option. Fortunately the only file that needs to be edited are in.dat and complxcalc.cpp files.
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Jun 27, 2014
I need to create a program that continuously records data until the user enters '0'
The data that I read in is the student's last name, the year of the student (1-4), the major, the gpa, and the advisors name. I then need to print out how many students are in each year (1-4), the number of students each advisor has, the average gpa for each major, and so on. This is what I have, but I am stuck and think that I might be headed the wrong direction because the only thing working is the loop (not my gpa test calc).
//This program displays information pertaining to students
#include <iostream>
#include <string>
using namespace std;
int main () {
int studYear;
double average, studGpa;
string studName, studMajor, studAdvisor, complete;
[code]....
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Mar 30, 2014
I know that the issue is around the array distance being of type double in the function get distance of type double. My question is how do i get around using the values from the distance array in the function to be used for calculations.
#include <stdio.h>/* initialization of preprocessor directives*/
#include <stdlib.h>
#include <math.h> /*preprocessor directive in order to use sqrt function*/
int calcSecondsvar(int,int,int ,double);
double getdistance(double,double,int,int,int);
[Code] ....
I forgot to mention that it keeps giving me the error cannot convert from 'double[8] to 'double' ....
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Sep 30, 2013
getting output from my code when I compile, the codeblocks ide doesnt show any errors it just doesn't give me any out put when I compile?
Here is my code:
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
//
//CLASS DECLARATION SECTION
[code].....
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Jan 30, 2014
I have a 125X125 array, each element is 55 bits. The cache line for the CPU ( Cortex A9) is 32 bits. Is there anyway to do optimizations, like loop tiling that would make multiplication and calculations faster?
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Oct 30, 2013
My project is to get a file from a designated location in my computer and not just read, but grab the values from the user and make a count, sum, and average calculation of the numbers in my code. I am using the fstream library and I am trying I did do it, I got the values and calcualated them, however I want the values to be accessed from maybe my desktop or my drive, I want to know how to manipulate my code to get a path like C:UserDesktop and maybe executed from the path input or given. I dont know if this is possible, or easy to do. ALso I did copy some of this code from my teachers examples and I dont know exatly why the variables have to be initilized at zero, and I would like to know a little more on the Bitwise right shift breaker used in line 20 something.
Here is my code below.
#include <iostream>//For avergae functionality
#include <fstream>//For the file commands, such as ifstream and the Bitwise right breakers(<< and >>).
#include <iomanip> // To control the amount of decimals in my results desired.
using namespace std;
int main () {
int aNumber=0; //Initilized at zero because of Stack Overflow:
[Code] .....
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Feb 17, 2014
I am trying to create an billing system "without using pointers". This is my class assignment. In this,
1) User inputs the name
2) The system asks how many items he has purchased
3) Displays a bill number [just a random number]
4) System asks for the item names the user purchased and stores them in an array (of max 10 (ten) inputs (or items))
5) After each item the user inputs, the system asks for the price of the item (stored in an array of numbers)
6) The total bill is calculated, by adding the sum of all prices in the array
I am having terrible difficulties in coding #4 and #5. Somehow, they aren't going well together. Here's what I have:
#include<stdio.h>
#include <stdlib.h>
int main() {
char item[10][10], answer = 'y', name;
int price[10], total_item, total_price = 0, i, j, a, total_bill = 0, max_items = 10, max_char = 10;
[Code] ....
You might find a lot of unused variables
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Jul 27, 2013
Here what i have so far, the error in the stream
[CODE]
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim fileName As String = IO.File.ReadAllText("Grades.txt")
Dim GPA As Double = 0
[Code]....
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Feb 11, 2013
I'm using MSVC++ and it builds sucessfully but somewhere something is obviously messed it. Once i try to debug it just shows weird numbers.
int k=0; //could this be the problem??? since 0 would be over writing any given value. but if i leave int k; it showsa warning and MSVC would count that as an error
#include "stdafx.h" //Header file section
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
//structure declaration
struct menuitemtype
[Code] ......
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