输出排序结果用R语言实现
时间: 2024-03-30 22:39:03 浏览: 24
假设 "coronavirus" 数据集包含以下数据:
| country | cases |
| ------- | ----- |
| USA | 100 |
| Brazil | 50 |
| India | 80 |
| Russia | 70 |
| Peru | 60 |
那么运行上述代码后,输出结果应该是:
```
# A tibble: 5 x 2
country total_cases
<chr> <dbl>
1 USA 100
2 India 80
3 Russia 70
4 Peru 60
5 Brazil 50
```
其中,"tibble" 是 R 语言中一种常用的数据框类型,与基本数据框(data frame)类似,但具有更好的打印和显示效果。
相关问题
分别用堆排序及快速排序算法,对待排序记录进行排序并输出排序结果。c语言实现
好的,以下是 C 语言代码实现:
堆排序:
```c
#include <stdio.h>
void heap_sort(int arr[], int n);
void heapify(int arr[], int n, int i);
int main()
{
int arr[] = {12, 11, 13, 5, 6, 7};
int n = sizeof(arr) / sizeof(arr[0]);
printf("原数组:");
for (int i = 0; i < n; ++i) {
printf("%d ", arr[i]);
}
heap_sort(arr, n);
printf("\n堆排序后:");
for (int i = 0; i < n; ++i) {
printf("%d ", arr[i]);
}
return 0;
}
void heap_sort(int arr[], int n)
{
for (int i = n / 2 - 1; i >= 0; --i) {
heapify(arr, n, i);
}
for (int i = n - 1; i >= 0; --i) {
int temp = arr[0];
arr[0] = arr[i];
arr[i] = temp;
heapify(arr, i, 0);
}
}
void heapify(int arr[], int n, int i)
{
int largest = i;
int l = 2 * i + 1;
int r = 2 * i + 2;
if (l < n && arr[l] > arr[largest]) {
largest = l;
}
if (r < n && arr[r] > arr[largest]) {
largest = r;
}
if (largest != i) {
int temp = arr[i];
arr[i] = arr[largest];
arr[largest] = temp;
heapify(arr, n, largest);
}
}
```
快速排序:
```c
#include <stdio.h>
void quick_sort(int arr[], int low, int high);
int partition(int arr[], int low, int high);
int main()
{
int arr[] = {12, 11, 13, 5, 6, 7};
int n = sizeof(arr) / sizeof(arr[0]);
printf("原数组:");
for (int i = 0; i < n; ++i) {
printf("%d ", arr[i]);
}
quick_sort(arr, 0, n - 1);
printf("\n快速排序后:");
for (int i = 0; i < n; ++i) {
printf("%d ", arr[i]);
}
return 0;
}
void quick_sort(int arr[], int low, int high)
{
if (low < high) {
int pi = partition(arr, low, high);
quick_sort(arr, low, pi - 1);
quick_sort(arr, pi + 1, high);
}
}
int partition(int arr[], int low, int high)
{
int pivot = arr[high];
int i = low - 1;
for (int j = low; j < high; ++j) {
if (arr[j] < pivot) {
++i;
int temp = arr[i];
arr[i] = arr[j];
arr[j] = temp;
}
}
int temp = arr[i + 1];
arr[i + 1] = arr[high];
arr[high] = temp;
return i + 1;
}
```
以上代码仅供参考,实际使用时建议先进行测试和优化。
用PHP语言 实现 希尔排序
下面是 PHP 语言实现希尔排序的代码:
```php
function shellSort($arr)
{
$n = count($arr);
for ($gap = floor($n / 2); $gap > 0; $gap = floor($gap / 2)) {
for ($i = $gap; $i < $n; $i++) {
$j = $i;
while ($j - $gap >= 0 && $arr[$j - $gap] > $arr[$j]) {
$temp = $arr[$j];
$arr[$j] = $arr[$j - $gap];
$arr[$j - $gap] = $temp;
$j -= $gap;
}
}
}
return $arr;
}
```
使用方法:
```php
$arr = array(5, 3, 8, 4, 2);
$result = shellSort($arr);
print_r($result); // 输出:Array ( [0] => 2 [1] => 3 [2] => 4 [3] => 5 [4] => 8 )
```
其中,shellSort 函数接收一个数组作为参数,返回排好序的数组。该函数使用希尔排序算法对数组进行排序。