celestialphineas

#!/bin/bash

# A simple homework management system in bash
#============================================
# By: Celestial Phineas @ ZJU (Yehang YIN)
# July 14, 2017

# No database is used in this project.
# It is based on pure ASCII text files.
# Serves as a homework and demo.

celestialphineas

ζ[x_] := (1 - x/10) Sqrt[1 - Abs[x^3]];
η[x_] := (1 - x/10) Sqrt[1 - Abs[x^2]];
Show[
  ParametricPlot3D[{{4/5 ζ[v] Cos[u], 4/5 ζ[v] Sin[u], v},
    {24/25 η[v] Cos[u], 1/2 η[-2 v] Sin[u],v - 1/6}},
    {u, 0, 2 π}, {v, -1, 1},
    PlotRange -> {{-1, 1}, {-1, 1}, {-1, 1.2}}, Mesh -> None, 
    PlotStyle -> Directive[Yellow, Specularity[White, 20]]],
    
  Graphics3D[

celestialphineas

r = 10;
it[{x_, y_}] := 
  If[2 (r^2 - x^2 - y^2) - 4 x + 2 y - 3 > 0, {x + 1, y}, {x + 1, 
    y - 1}];
oct = NestWhileList[it, {0, r}, #[[1]] <= #[[2]] &][[1 ;; -2]];
showMatPlot[points_List] := 
 MatrixPlot@SparseArray[# + {r + 1, r + 1} -> 1 & /@ points]
showMatPlot[
 Join[oct, # /. {{x_, y_} -> {y, x}} & /@ 
   oct, # /. {{x_, y_} -> {x, -y}} & /@ 

celestialphineas

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>

void write_pixel(int a, int b)
{
    int *k = (int*)malloc(2 * sizeof(int));
    k[0] = a; k[1] = b;
    free(k);

celestialphineas

F[x_] := NumberForm[HarmonicNumber[x]/x, 20]
str = StringJoin[
   ToString[#] <> "\n" & /@ ({N[\[Pi]^2/6, 13]}~Join~
      Table[F[i], {i, 0.1, 300, 0.1}])];
Export["D:\\na\\mma.txt", str]

celestialphineas

1.644934066848
1.534607244905
1.440878841547
1.360082586782
1.289577800791
1.227411277760
1.172105196125
1.122519342536
1.077758872744
1.037110917851

celestialphineas

#include <stdio.h>

void Series_Sum(double sum[]);

int main()
{
    int i;
    double x, sum[3001];
	
    Series_Sum( sum );

celestialphineas

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <deque>
#include <unistd.h>
#include <pthread.h>
#include <algorithm>
// #define TEST_OUTPUT

celestialphineas

#include <stdio.h>
#include <string.h>

void Series_Sum(double sum[]);

int main(void)
{
    int i;
    double x, sum[3001];
    memset((void*)sum, 0xffffffff, sizeof(sum));

celestialphineas

#include <stdio.h>

void Series_Sum(double sum[]);

int main(void)
{
    int i;
    double x, sum[3001];

    Series_Sum(sum);