Skip to content

hw4 #42

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
wants to merge 1 commit into
base: main
Choose a base branch
from
Open

hw4 #42

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
20 changes: 20 additions & 0 deletions .vscode/c_cpp_properties.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,20 @@
{
"configurations": [
{
"name": "Win32",
"includePath": [
"${workspaceFolder}/**"
],
"defines": [
"_DEBUG",
"UNICODE",
"_UNICODE"
],
"compilerPath": "C:\\Program Files\\mingw64\\bin\\gcc.exe",
"cStandard": "c23",
"cppStandard": "c++17",
"intelliSenseMode": "gcc-x64"
}
],
"version": 4
}
7 changes: 7 additions & 0 deletions .vscode/launch.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,7 @@
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": []
}
77 changes: 77 additions & 0 deletions .vscode/settings.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,77 @@
{
"files.associations": {
"array": "cpp",
"atomic": "cpp",
"*.tcc": "cpp",
"cctype": "cpp",
"clocale": "cpp",
"cmath": "cpp",
"cstdarg": "cpp",
"cstddef": "cpp",
"cstdint": "cpp",
"cstdio": "cpp",
"cstdlib": "cpp",
"cwchar": "cpp",
"cwctype": "cpp",
"deque": "cpp",
"unordered_map": "cpp",
"vector": "cpp",
"exception": "cpp",
"algorithm": "cpp",
"memory": "cpp",
"memory_resource": "cpp",
"optional": "cpp",
"string": "cpp",
"string_view": "cpp",
"system_error": "cpp",
"tuple": "cpp",
"type_traits": "cpp",
"utility": "cpp",
"fstream": "cpp",
"initializer_list": "cpp",
"iosfwd": "cpp",
"iostream": "cpp",
"istream": "cpp",
"limits": "cpp",
"new": "cpp",
"ostream": "cpp",
"sstream": "cpp",
"stdexcept": "cpp",
"streambuf": "cpp",
"typeinfo": "cpp",
"cfenv": "cpp",
"map": "cpp",
"chrono": "cpp",
"codecvt": "cpp",
"ctime": "cpp",
"ratio": "cpp",
"iomanip": "cpp",
"bitset": "cpp",
"variant": "cpp",
"typeindex": "cpp",
"charconv": "cpp",
"cinttypes": "cpp",
"complex": "cpp",
"condition_variable": "cpp",
"csetjmp": "cpp",
"csignal": "cpp",
"cstring": "cpp",
"cuchar": "cpp",
"forward_list": "cpp",
"list": "cpp",
"unordered_set": "cpp",
"functional": "cpp",
"iterator": "cpp",
"numeric": "cpp",
"random": "cpp",
"regex": "cpp",
"set": "cpp",
"future": "cpp",
"mutex": "cpp",
"scoped_allocator": "cpp",
"shared_mutex": "cpp",
"thread": "cpp",
"valarray": "cpp"
},
"C_Cpp.errorSquiggles": "disabled"
}
32 changes: 32 additions & 0 deletions .vscode/tasks.json
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,32 @@
{
"version": "2.0.0",
"tasks": [
{
"type": "cppbuild",
"label": "C/C++: g++.exe build active file",
"command": "C:\\Program Files\\mingw64\\bin\\g++.exe",
"args": [
"-fdiagnostics-color=always",
"-g",
"${file}",
"-o",
"${fileDirname}\\${fileBasenameNoExtension}.exe",
"-std=c++2a",
"-O3 ",
"-mavx",
"-ffast-math"
],
"options": {
"cwd": "${fileDirname}"
},
"problemMatcher": [
"$gcc"
],
"group": {
"kind": "build",
"isDefault": true
},
"detail": "compiler: \"C:\\Program Files\\mingw64\\bin\\g++.exe\""
}
]
}
81 changes: 48 additions & 33 deletions main.cpp
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -3,26 +3,28 @@
#include <vector>
#include <chrono>
#include <cmath>

#include <array>
float frand() {
return (float)rand() / RAND_MAX * 2 - 1;
return (float)std::rand() /RAND_MAX * 2- 1;
}

struct Star {
float px, py, pz;
float vx, vy, vz;
float mass;
std::array<float, 48> px, py, pz;
std::array<float, 48> vx, vy, vz;
std::array<float, 48> mass;
};

std::vector<Star> stars;
Star stars;

void init() {
for (int i = 0; i < 48; i++) {
stars.push_back({
frand(), frand(), frand(),
frand(), frand(), frand(),
frand() + 1,
});
for (std::size_t i = 0; i < 48; i++) {
stars.px[i] = frand();
stars.py[i] = frand();
stars.pz[i] = frand();
stars.vx[i] = frand();
stars.vy[i] = frand();
stars.vz[i] = frand();
stars.mass[i] = frand() + 1;
}
}

Expand All @@ -31,36 +33,49 @@ float eps = 0.001;
float dt = 0.01;

void step() {
for (auto &star: stars) {
for (auto &other: stars) {
float dx = other.px - star.px;
float dy = other.py - star.py;
float dz = other.pz - star.pz;
for (std::size_t i = 0; i < stars.px.size(); i++) {
float temp_vx = 0;
float temp_vy = 0;
float temp_vz = 0;

for (std::size_t j = 0; j < stars.px.size(); j++) {
float dx = stars.px[j] - stars.px[i];
float dy = stars.py[j] - stars.py[i];
float dz = stars.pz[j] - stars.pz[i];
float d2 = dx * dx + dy * dy + dz * dz + eps * eps;
d2 *= sqrt(d2);
star.vx += dx * other.mass * G * dt / d2;
star.vy += dy * other.mass * G * dt / d2;
star.vz += dz * other.mass * G * dt / d2;
d2 *= std::sqrt(d2);
temp_vx += dx * stars.mass[j] * G * dt / d2;
temp_vy += dy * stars.mass[j] * G * dt / d2;
temp_vz += dz * stars.mass[j] * G * dt / d2;
}
stars.vx[i] += temp_vx;
stars.vy[i] += temp_vy;
stars.vz[i] += temp_vz;
}
for (auto &star: stars) {
star.px += star.vx * dt;
star.py += star.vy * dt;
star.pz += star.vz * dt;

float temp_px = 0;
float temp_py = 0;
float temp_pz = 0;
for (std::size_t i = 0; i < stars.px.size(); i++) {
stars.px[i] += stars.vx[i] * dt;
stars.py[i] += stars.vy[i] * dt;
stars.pz[i] += stars.vz[i] * dt;
}


}

float calc() {
float energy = 0;
for (auto &star: stars) {
float v2 = star.vx * star.vx + star.vy * star.vy + star.vz * star.vz;
energy += star.mass * v2 / 2;
for (auto &other: stars) {
float dx = other.px - star.px;
float dy = other.py - star.py;
float dz = other.pz - star.pz;
for (std::size_t i = 0; i < stars.px.size(); i++) {
float v2 = stars.vx[i] * stars.vx[i] + stars.vy[i] * stars.vy[i] + stars.vz[i] * stars.vz[i];
energy += stars.mass[i] * v2 / 2;
for (std::size_t j = 0; j < stars.px.size(); j++) {
float dx = stars.px[j] - stars.px[i];
float dy = stars.py[j] - stars.py[i];
float dz = stars.pz[j] - stars.pz[i];
float d2 = dx * dx + dy * dy + dz * dz + eps * eps;
energy -= other.mass * star.mass * G / sqrt(d2) / 2;
energy -= stars.mass[j] * stars.mass[i] * G / std::sqrt(d2) / 2;
}
}
return energy;
Expand Down