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ЛЕКЦИИ ................................................................................................... 3 Лекция № 1. Теория погрешностей .................................................................... 5 1.1.1. Источники и классификация погрешностей ......................................................... 5 1.1.2. Абсолютная и относительная погрешности. Формы записи данных ................. 7 1.1.3. Вычислительная погрешность ............................................................................... 9 1.1.4. Понятие погрешности машинных вычислений .................................................. 10 Лекция № 2. Решение уравнений с одной переменной ................................ 15 1.2.1. Постановка задачи ................................................................................................ 15 1.2.2. Отделение корней ................................................................................................. 16 1.2.3. Метод половинного деления................................................................................ 17 1.2.4. Метод простой итерации...................................................................................... 20 1.2.5. Оценка погрешности метода простой итерации ................................................ 23 1.2.6. Преобразование уравнения к итерационному виду ........................................... 24 1.2.7. Решение уравнений методом простой итерации в пакете Mathcad .................. 24 Лекция № 3. Методы решения систем линейных алгебраических уравнений ............................................................. 27 1.3.1. Общие сведения и основные определения ......................................................... 27 1.3.2. Метод Гаусса и его реализация в пакете Mathcad.............................................. 28 1.3.3. Вычисление определителей ................................................................................. 32 1.3.4. Решение систем линейных уравнений методом простой итерации ................. 34 1.3.5. Метод Зейделя....................................................................................................... 40 IV Оглавление Лекция № 4. Методы решения систем нелинейных уравнений.................. 44 1.4.1. Векторная запись нелинейных систем. Метод простых итераций ................... 44 1.4.2. Метод Ньютона решения систем нелинейных уравнений ................................ 48 1.4.3. Решение нелинейных систем методами спуска ................................................. 52 1.4.4. Модифицированный метод Ньютона .................................................................. 67 Лекция № 5. Интерполирование функций....................................................... 73 1.5.1. Постановка задачи ................................................................................................ 73 1.5.2. Интерполяционный полином Лагранжа ............................................................. 76 1.5.3. Интерполяционный полином Ньютона для равноотстоящих узлов ................. 78 1.5.4. Погрешность интерполяции ................................................................................ 82 1.5.5. Сплайн-интерполяция .......................................................................................... 83 Лекция № 6. Численное дифференцирование и интегрирование ............. 90 1.6.1. Дифференцирование функций, заданных аналитически ................................... 90 1.6.2. Особенности задачи численного дифференцирования функций, заданных таблично ......................................................................................................... 93 1.6.3. Интегрирование функций, заданных аналитически (формула прямоугольников, формула трапеций, формула Симпсона) ...................... 94 1.6.4. Погрешность численного интегрирования ......................................................... 98 1.6.5. Вычисление интегралов методом Монте-Карло .............................................. 101 Лекция № 7. Методы обработки экспериментальных данных ................. 104 1.7.1. Метод наименьших квадратов ........................................................................... 104 1.7.2. Нахождение приближающей функции в виде линейной функции и квадратичного трехчлена .......................................................................................... 108 1.7.3. Нахождение приближающей функции в виде элементарных функций ......... 112 1.7.4. Аппроксимация линейной комбинацией функций .......................................... 115 1.7.5. Аппроксимация функцией произвольного вида............................................... 117 Лекция № 8. Преобразование Фурье ............................................................. 120 1.8.1. Разложение периодических функций в ряд Фурье .......................................... 120 1.8.2. Эффект Гиббса .................................................................................................... 123 1.8.3. Спектральный анализ дискретных функций конечной длительности............ 128 1.8.4. Быстрое преобразование Фурье ........................................................................ 129 Лекция № 9. Численные методы решения обыкновенных дифференциальных уравнений ......................................... 134 1.9.1. Постановка задачи .............................................................................................. 134 1.9.2. Метод Пикара...................................................................................................... 137 Оглавление 1.9.3. 1.9.4. V Метод Эйлера...................................................................................................... 139 Метод Рунге—Кутты.......................................................................................... 144 Лекция № 10. Численные методы решения дифференциальных уравнений в частных производных ........................ 150 1.10.1. 1.10.2. 1.10.3. 1.10.4. 1.10.5. 1.10.6. Примеры уравнений ......................................................................................... 150 Типы уравнений ................................................................................................ 151 Численные методы решения эллиптических уравнений ............................... 153 Явные разностные схемы ................................................................................. 158 Неявная разностная схема для уравнения параболического типа ................ 163 Решение уравнений методом Монте-Карло ................................................... 168 Лекция № 11. Численные методы решения интегральных уравнений ... 174 1.11.1. 1.11.2. 1.11.3. Общие сведения об интегральных уравнениях .............................................. 174 Квадратурный метод решения интегральных уравнений Фредгольма ........ 180 Квадратурный метод решения интегральных уравнений Вольтерры .......... 184 ЧАСТЬ II. ЛАБОРАТОРНЫЕ РАБОТЫ ............................................................. 193 Лабораторная работа № 1. Теория приближенных вычислений ............. 195 2.1.1. 2.1.2. 2.1.3. 2.1.4. 2.1.5. 2.1.6. 2.1.7. 2.1.8. Абсолютная и относительная погрешности ..................................................... 195 Погрешность округленного числа..................................................................... 198 Погрешности арифметических действий.......................................................... 200 Погрешности элементарных функций .............................................................. 202 Способ границ ..................................................................................................... 205 Обратная задача теории погрешностей ............................................................ 210 Вопросы по теме ................................................................................................. 212 Задания к лабораторной работе № 1 ................................................................. 213 Лабораторная работа № 2. Численные методы решения скалярных уравнений ....................................................................................... 220 2.2.1. 2.2.2. 2.2.3. 2.2.4. 2.2.5. Метод хорд .......................................................................................................... 220 Метод касательных ............................................................................................. 223 Метод простой итерации.................................................................................... 226 Вопросы по теме ................................................................................................. 230 Задания к лабораторной работе № 2 ................................................................. 231 Лабораторная работа № 3. Численные методы решения систем линейных уравнений ........................................................................... 234 2.3.1. 2.3.2. Метод Гаусса—Жордана.................................................................................... 235 Метод простой итерации.................................................................................... 236 Оглавление VI 2.3.3. 2.3.4. 2.3.5. Метод Зейделя..................................................................................................... 241 Вопросы по теме ................................................................................................. 243 Задание к лабораторной работе № 3 ................................................................. 244 Лабораторная работа № 4. Численные методы решения систем нелинейных уравнений....................................................................... 248 2.4.1. 2.4.2. Метод Ньютона................................................................................................... 248 Задание к лабораторной работе № 4 ................................................................. 252 Лабораторная работа № 5. Приближение значения таблично заданной функции в точке с помощью интерполяционных многочленов ............................................. 255 2.5.1. 2.5.2. 2.5.3. 2.5.4. 2.5.5. Интерполяционный полином Лагранжа ........................................................... 256 Интерполяционные полиномы Ньютона .......................................................... 259 Интерполирование сплайнами........................................................................... 262 Вопросы по теме ................................................................................................. 266 Задание к лабораторной работе № 5 ................................................................. 266 Лабораторная работа № 6. Обратное интерполирование ......................... 273 2.6.1. 2.6.2. 2.6.3. 2.6.4. Обратное интерполирование с использованием формул Ньютона ................ 273 Обратное интерполирование с использованием формулы Лагранжа ............ 277 Вопросы по теме ................................................................................................. 278 Задание к лабораторной работе № 6 ................................................................. 278 Лабораторная работа № 7. Дискретный вариант среднеквадратичных приближений. Метод наименьших квадратов ...... 282 2.7.1. 2.7.2. 2.7.3. 2.7.4. 2.7.5. 2.7.6. 2.7.7. 2.7.8. Линейная функция .............................................................................................. 282 Квадратичная функция ....................................................................................... 285 Степенная функция............................................................................................. 287 Показательная функция...................................................................................... 288 Логарифмическая функция ................................................................................ 290 Гиперболическая функция ................................................................................. 291 Вопросы по теме ................................................................................................. 293 Задание для лабораторной работы № 7 ............................................................ 293 Лабораторная работа № 8. Численное дифференцирование................... 298 2.8.1. Дифференцирование с помощью интерполяционной формулы Лагранжа ....................................................................................................... 298 2.8.2. Вопросы по теме ................................................................................................. 302 2.8.3. Задание к лабораторной работе № 8 ................................................................. 303 Оглавление VII Лабораторная работа № 9. Численное интегрирование ............................ 304 2.9.1. 2.9.2. 2.9.3. 2.9.4. 2.9.5. 2.9.6. Метод прямоугольников .................................................................................... 305 Метод Симпсона ................................................................................................. 306 Метод трапеций .................................................................................................. 307 Метод Монте-Карло ........................................................................................... 308 Вопросы по теме ................................................................................................. 309 Задание к лабораторной работе № 9 ................................................................. 310 Лабораторная работа № 10. Решение обыкновенных дифференциальных уравнений ..................................................................... 314 2.10.1. 2.10.2. 2.10.3. 2.10.4. 2.10.5. 2.10.6. Метод Пикара.................................................................................................... 314 Метод Эйлера и его модификации .................................................................. 317 Метод Рунге—Кутты........................................................................................ 320 Метод Адамса ................................................................................................... 322 Вопросы по теме ............................................................................................... 324 Задание к лабораторной работе № 10 ............................................................. 325 Лабораторная работа № 11. Численное решение дифференциальных уравнений в частных производных ........................ 329 2.11.1. 2.11.2. 2.11.3. 2.11.4. 2.11.5. Решение задачи Дирихле для уравнения Лапласа методом сеток ................ 329 Решение уравнения теплопроводности методом сеток ................................. 335 Решение уравнения колебания струны методом сеток.................................. 338 Вопросы по теме ............................................................................................... 341 Задание к лабораторной работе № 11 ............................................................. 342 Лабораторная работа № 12. Численное решение интегральных уравнений ................................................................................. 352 2.12.1. Задание к лабораторной работе № 12 ............................................................. 352 ПРИЛОЖЕНИЯ .................................................................................................... 355 Приложение 1. Основные приемы работы с пакетом Mathcad ................ 357 П1.1. Основы работы с Mathcad .................................................................................. 357 П1.2. Справочная информация в Mathcad .................................................................. 367 П1.3. Основы программирования................................................................................ 375 П1.4. Графические возможности Mathcad .................................................................. 380 Приложение 2. Аналитические методы решения дифференциальных уравнений в частных производных ........................ 394 П2.1. Точные методы решения дифференциальных уравнений в частных производных ............................................................................. 394 VIII Оглавление П2.2. Приближенные методы решения дифференциальных уравнений в частных производных ................................................................................................ 428 П2.3. Метод обратной задачи рассеяния .................................................................... 439 Приложение 3. 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