dataframe loc
dataframe loc is a command line tool for data exploration and visualization. It is good for exploring data for those who are already familiar with the data and needs to visualize immediately. It can create graphs from sql, csv, txt, xml files quickly.
df.loc
on Jun 05, 2022
# Getting values on a DataFrame with an index that has interger "labels"
df = pd.DataFrame([[1, 2], [4, 5], [7, 8]],
... index=[7, 8, 9], columns=['max_speed', 'shield'])
>>> df
max_speed shield
7 1 2
8 4 5
9 7 8
# the integer is interpreted as "label" but NOT an "interger position along the index"
>>> df.loc[7:9]
max_speed shield
7 1 2
8 4 5
9 7 80
function for quicksort in c
on Jun 05, 2022
#include<stdio.h>
void swap(int* a, int* b)
{
int t = *a;
*a = *b;
*b = t;
}
int partition (int arr[], int low, int high)
{
int pivot = arr[high];
int i = (low - 1);
for (int j = low; j <= high- 1; j++)
{
if (arr[j] <= pivot)
{
i++;
swap(&arr[i], &arr[j]);
}
}
swap(&arr[i + 1], &arr[high]);
return (i + 1);
}
void quickSort(int arr[], int low, int high)
{
if (low < high)
{
int pi = partition(arr, low, high);
quickSort(arr, low, pi - 1);
quickSort(arr, pi + 1, high);
}
}
void printArray(int arr[], int size)
{
int i;
for (i=0; i < size; i++)
printf("%d ", arr[i]);
printf("n");
}
int main()
{
int arr[] = ;
int n = sizeof(arr)/sizeof(arr[0]);
quickSort(arr, 0, n-1);
printf("The sorted array is: n");
printArray(arr, n);
return 0;
}0
quick sort c
on Jun 05, 2022
#include<stdio.h>
#define MAX 100
int insert_array(int a[]) {
int n, i;
printf("Quanti elementi?: ");
scanf("%d", &n);
for (i=0; i<n; i++) {
printf("elemento %d: ", i);
scanf("%d", &a[i]);
}
return(n);
}
void stampa_array(int a[], int n) {
int i;
for (i=0; i<n; i++) {
printf("%d ", a[i]);
}
printf("\n");
return;
}
void quicksort(int a[MAX],int primo,int ultimo){
int i, j, pivot, temp;
/*pivot -- inizialmente il pivot è il primo elemento
primo e ultimo sono le due variabili che servono per scorrere l'array
*/
if(primo<ultimo){
pivot=primo;
i=primo;
j=ultimo;
while(i<j){
while(a[i]<=a[pivot]&&i<ultimo)
i++;
while(a[j]>a[pivot])
j--;
if(i<j){
temp=a[i];
a[i]=a[j];
a[j]=temp;
}
}
temp=a[pivot];
a[pivot]=a[j];
a[j]=temp;
quicksort(a,primo,j-1);
quicksort(a,j+1,ultimo);
}
}
int main(){
int n, a[MAX],i;
n = insert_array(a);
printf("Array iniziale: ");
stampa_array(a,n);
quicksort(a,0,n-1);
printf("Array ordinato con quick-sort: ");
stampa_array(a,n);
return 0;
}0
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