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  1. #include <iostream>
  2. #include <vector> 
  3. #include <array> 
  4. #include <fstream> 
  5. #include <math.h> 
  6.  
  7. using namespace std;
  8. const double pi = 3.14;
  9.  
  10. void fillArrayY(const double* x, double* y, int size, double a, double b, double c) {
  11.     for (int i = 0; i < size; i++) {
  12.         y[i] = a * sin(x[i]) - b * sin(2 * x[i]) + c * sin(3 * x[i]);
  13.     }
  14. }
  15. void fillArrayX(double* x, int points, double df, double dy) {
  16.     for (int i = 0; i < points; i++) {
  17.         x[i] = df + i * ((dy - df) / (points - 1));
  18.     }
  19. }
  20. void fillArray(double* a, int n) {
  21.     int i = 2, k = 2;
  22.     for (int i = 0; i < n; i++) {
  23.         a[i] = sin(pi * k * i / n);
  24.     }
  25. }
  26. void printArray1(double* a, int n) {
  27.     cout << "PR1";
  28.     cout << "[" << n << "]";
  29.     for (int i = 0; i < n; i++) {
  30.         cout << a[i] << ' ';
  31.     }
  32. }
  33. void printArray2(double* arr, double count, double a, double b) {
  34.     double sum;
  35.     sum = b - a;
  36.     for (int i = 0; i < count; i++) {
  37.         sum = a + i * ((b - a) / (count - 1));
  38.         arr[i] = sum;
  39.     }
  40. }
  41. void saveArray(const char* fileName, double* a, int n) {
  42.     std::ofstream f;
  43.     f.open(fileName);
  44.     for (int i = 0; i < n; i++) {
  45.         f << i << "\t" << a[i] << "\n";
  46.     }
  47.     f.close();
  48. }
  49. void saveArray1(const char* fileName, double* x, double* y, int n) {
  50.     std::ofstream f;
  51.     f.open(fileName);
  52.     for (int i = 0; i < n; i++) {
  53.         f << x[i] << "\t" << y[i] << "\n";
  54.     }
  55.     f.close();
  56. }
  57. void plotFile(const char* fileName) {
  58.     std::ofstream f;
  59.     f.open("plot.plt");
  60.     f << "plot '" << fileName << "' with linespoints pt 7 ps 2\n";
  61.     f << "pause -1\n";
  62.     f.close();
  63.     system("\"C:\\Program Files\\gnuplot\\bin\\gnuplot.exe\" plot.plt");
  64. }
  65. void saveMaxPoints(const vector <double>& arrMax, double a, double b, double c, const char* fileName) {
  66.     std::ofstream f;
  67.     f.open(fileName);
  68.  
  69.     for (int i = 0; i < arrMax.size(); i++) {
  70.         f << arrMax[i] << " " << a * sin(arrMax[i]) - b * sin(2 * arrMax[i]) + c * sin(3 * arrMax[i]) << "\n";
  71.     }
  72.     f.close();
  73. }
  74.  
  75. void saveMinPoints(const vector <double>& arrMin, double a, double b, double c, const char* fileName) {
  76.     std::ofstream f;
  77.     f.open(fileName);
  78.  
  79.     for (int i = 0; i < arrMin.size(); i++) {
  80.         f << arrMin[i] << " " << a * sin(arrMin[i]) - b * sin(2 * arrMin[i]) + c * sin(3 * arrMin[i]) << "\n";
  81.     }
  82.     f.close();
  83. }
  84. vector <double> findelocalMin(const double* x,const double* y, int n) {
  85.     vector <double> vec;
  86.     for (int i = 1; i < n - 1; i++) {
  87.         if (abs(y[i - 1]) < abs(y[i]) && abs(y[i]) > abs(y[i + 1])) {
  88.             vec.push_back(x[i]);
  89.         }
  90.     }
  91.     cout << "\n";
  92.     return vec;
  93. }
  94. vector <double> findelocalMax(const double* x, const double* y, int n) {
  95.         vector <double> vec;
  96.         for (int i = 1; i < n - 1; i++) {
  97.             if (x[i - 1] > x[i] && y[i] < y[i + 1]) {
  98.                 vec.push_back(x[i]);
  99.             }
  100.         }
  101.         cout << "\n";
  102.         return vec;
  103. }
  104. void saveArray2(const char* fileName1, double* x, double* y, int n) {
  105.     std::ofstream f;
  106.     f.open(fileName1);
  107.     for (int i = 0; i < n; i++) {
  108.         f << x[i] << "\t" << y[i] << "\n";
  109.     }
  110.     f.close();
  111. }
  112. void plotFile1(const char* fileName1, double* LS) {
  113.     std::ofstream f;
  114.     int num = 0;
  115.     for (int i = 0; i < 20; i++) {
  116.         if (abs(LS[i]) > num) {
  117.             num = i;
  118.         }
  119.     }
  120.     f.open("plot1.plt");
  121.     f << "plot '" << fileName1 << "' with linespoints pt 7 ps 2\n";
  122.     f << num << " linecolor \"orange""\n";
  123.     f << "pause -1\n";
  124.     f.close();
  125.     system("\"C:\\Program Files\\gnuplot\\bin\\gnuplot.exe\" plot1.plt");
  126. }
  127.  
  128. int main() {
  129.     int const points = 20;
  130.     double  x[points];
  131.     double  y[points];
  132.     double  LS[points];
  133.     double a = 5, b = 2, c = 1;
  134.     vector <double> Maxarg;
  135.     vector <double> Minarg;
  136.     fillArrayX(x, points, 0, 4 * pi);
  137.     fillArrayY(x, y, points, a, b, c);
  138.     fillArray(x, 20);
  139.     printArray1(x, 20);
  140.     printArray2(x, 6, 1, 2);
  141.     Maxarg = findelocalMax(x, y, points);
  142.     Minarg = findelocalMin(x, y, points);
  143.     saveArray("D:\\PMI 201B\\Lab1\\data.txt", x, 20);
  144.     saveMaxPoints(Maxarg, a, b, c, "maxpoints.txt");
  145.     saveMinPoints(Minarg, a, b, c, "minpoints.txt");
  146.     saveArray1("D:\\PMI 201B\\Lab1\\data.txt", x, y, points);
  147.     saveArray2("D:\\PMI 201B\\Lab1\\data.txt", x, y, points);
  148.     plotFile("D:\\PMI 201B\\Lab1\\data.txt");
  149.     return 0;
  150. }
Success #stdin #stdout #stderr 0.01s 5296KB
comments (?)
stdin
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Standard input is empty
stdout
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PR1[20]0 0.308866 0.587528 0.808736 0.950859 1 0.951351 0.809672 0.588816 0.31038 0.00159265 -0.30735 -0.586238 -0.807798 -0.950365 -0.999997 -0.951841 -0.810605 -0.590102 -0.311894
stderr
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sh: 1: C:\Program Files\gnuplot\bin\gnuplot.exe: not found
https://ideone.com/Ef0CyG
language:
C++ (gcc 8.3)
created:
4 days ago
visibility:
public

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