tools

Documentation

Overview

Package tools Generic function for math, Array, Insert etc

Index

• func AbsInt(x int) int
• func BigIntToBinStr(b *big.Int) string
• func BinStrAdd(s, a string) *big.Int
• func BinStrToBigInt(s string) *big.Int
• func Copy2dInt(src [][]int) (des [][]int)
• func EqualMatrix(a, b [][]int) (res bool)
• func EucliDistSquared(x1, y1, x2, y2 int) int
• func InsertAt[K comparable](inp []K, position int, value []K) (res []K, err error)
• func InsertIntAt(inp []int, position int, value []int) (res []int, err error)
• func MaxInt(x, y int) int
• func MinInt(x, y int) int
• func Square(n int) int

Examples

• BinStrAdd
• InsertIntAt

Functions

func AbsInt

func AbsInt(x int) int

AbsInt 1=1 -1=1 (by doing -1 * -1 = 1)

func BigIntToBinStr

func BigIntToBinStr(b *big.Int) string

BigIntToBinStr Rerturn a big.Int as a String with binary value

func BinStrAdd

func BinStrAdd(s, a string) *big.Int

BinStrAdd add to string with binary valued and returns it sum as Big.Int Example BinStrAdd("111101","10") returns "111111" return 0 convert error and print "SetString: Error"

Example

one := BinStrAdd("11101", "10")
fmt.Println(BigIntToBinStr(one))
two := BinStrAdd(BigIntToBinStr(one), "1")
fmt.Println(BigIntToBinStr(two))

Output:
11111
100000

func BinStrToBigInt

func BinStrToBigInt(s string) *big.Int

BinStrToBigInt return "101010" return Big.Int with 101010 stored as int

func Copy2dInt

func Copy2dInt(src [][]int) (des [][]int)

Copy2dInt make copy [][]int 2d array.

func EqualMatrix

func EqualMatrix(a, b [][]int) (res bool)

EqualMatrix return two are the same [][]int

func EucliDistSquared

func EucliDistSquared(x1, y1, x2, y2 int) int

EucliDistSquared return part of euclidean distance (x1 - x2)2 + (y1 - y2)2

The full is euclidean distance is (sqrt) √(x1 - x2)2 + (y1 - y2)2) but this function is meant to be used to compare the short distance so if the answer is square 2 too big does not matter.

If the correct euclidean distance is need remember to int(math.Ceil(float64(EucliDistSquared(x,y)))) the result

Example fmt.Println(EucliDistSquared(0,0,1,3)) // OutPut : 10

log.Println(math.Ceil(math.Sqrt(float64(EucliDistSquared(0, 0, 1, 3))))) // This is the real distans // OutPut : 4

func InsertAt

func InsertAt[K comparable](inp []K, position int, value []K) (res []K, err error)

InsertAt insert []genric at position in array

func InsertIntAt

func InsertIntAt(inp []int, position int, value []int) (res []int, err error)

InsertIntAt insert []int at position in array

Example

a := []int{1, 2, 3}
fmt.Println("Array before:", a)

res, err := InsertIntAt(a, 0, []int{51, 56, 57})
if err != nil {
	fmt.Println(err)
}
fmt.Println("After insert 3 int in pos 0:", res)

Output:
Array before: [1 2 3]
After insert 3 int in pos 0: [51 56 57 1 2 3]

func MaxInt

func MaxInt(x, y int) int

MaxInt bigest number of x, y in int

func MinInt

func MinInt(x, y int) int

MinInt smallest number of x, y in int

func Square

func Square(n int) int

Square return n*n.