mmathlib/vector.hpp

#pragma once
#include "cnumber.hpp"
#include <iomanip>
#include <iostream>
class matrix;
class vector {
private:
  long long dimention = 0;
  cnumber *entries = NULL;
  bool err = true;

public:
  bool is_error() { return this->err; }
  vector(){};
  vector(const long long dimention) {
    this->err = false;
    this->dimention = dimention;
    free(this->entries);
    this->entries = (cnumber *)malloc(sizeof(cnumber) * dimention);
    for (long long i = 0; i < dimention; i++) {
      this->set_entry(i, cnumber(0, 0));
    }
  }
  vector(const vector &v) {
    this->err = false;
    this->dimention = v.get_dimention();
    free(this->entries);
    this->entries = (cnumber *)malloc(sizeof(cnumber) * v.get_dimention());
    for (long long i = 0; i < v.get_dimention(); i++) {
      this->set_entry(i, v.get_entry(i));
    }
  }
  ~vector() {
    this->dimention = 0;
    free(this->entries);
    // this->entries = NULL;
    this->err = true;
  }
  long long get_dimention() const { return this->dimention; }
  const cnumber *get_entries() const { return this->entries; }
  cnumber get_entry(const long long index) const {
    if (index < this->get_dimention()) {
      return this->entries[index];
    }
    return cnumber(0, 0);
  }
  void set_entry(const long long index, const cnumber z) {
    if (index < this->get_dimention()) {
      this->entries[index] = z;
    }
  }

  const cnumber operator[](const long long index) const {
    return this->get_entry(index);
  }

  // FIXME: Figure out how to make sure you do not try to access something
  // outside of the index
  cnumber &operator[](const long long index) { return this->entries[index]; }

  friend std::ostream &operator<<(std::ostream &os, const vector &v) {
    int longest = 0;
    for (long long i = 0; i < v.get_dimention(); i++) {
	    std::ostringstream oss;
      oss << v[i];
      std::string s = oss.str();
      if (longest < s.length())
	      longest = s.length();
    }
    for (long long i = 0; i < v.get_dimention(); i++) {
	    std::ostringstream oss;
      oss << v[i];
      std::string s = oss.str();
      int padding = longest - s.length() +1;
      os << "|" << v[i] << std::setw(padding) << "|";
      if (i != v.get_dimention() - 1)
        os << std::endl;
    }
    return os;
  }
  void operator=(const vector &v) {
    this->dimention = v.get_dimention();
    free(this->entries);
    this->entries = (cnumber *)malloc(sizeof(cnumber) * dimention);
    for (long long i = 0; i < v.get_dimention(); i++) {
      this->set_entry(i, v.get_entry(i));
    }
    this->err = false;
  }
  const vector operator+(const vector &v) const {
    if (this->get_dimention() != v.get_dimention()) {
      return vector(0);
    }
    vector sum = vector(v.get_dimention());
    for (long long i = 0; i < v.get_dimention(); i++) {
      sum[i] = this->get_entry(i) + v[i];
    }
    return sum;
  }

  const vector operator-(const vector &v) const {
    if (this->get_dimention() != v.get_dimention()) {
      return vector(0);
    }
    vector sum = vector(v.get_dimention());
    for (long long i = 0; i < v.get_dimention(); i++) {
      sum[i] = this->entries[i] - v[i];
    }
    return sum;
  }
  const vector operator*(const matrix &m) const;
  const vector operator*(const cnumber scalar) const {
    vector product = vector(this->get_dimention());
    for (long long i = 0; i < this->get_dimention(); i++) {
      product[i] = this->entries[i] * scalar;
    }
    return product;
  }
  const cnumber operator*(const vector &v) const {
    cnumber res(0, 0);
    for (long long i = 0; i < this->get_dimention(); i++) {
      res = res + this->get_entry(i) * v.get_entry(i);
    }
    return res;
  }
};