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What is the function of Sgn?
What is the function of sgn?

I am a high school student, and I teach myself advanced mathematics. I don't know what this is. Thank you!

Best answer

Step function in mathematics, symbolic function or return function in computer language. The Sgn function returns a variable (integer) indicating the sign of the parameter. Syntax Sgn(number) The necessary number parameter is any valid numeric expression.

X & gt0,sgnx= 1

x=0,sgnx= 0

x & lt0,sgnx=- 1

note:

The derivative of1.y = ABS (x) (absolute value of x) is about sgn(x) (non-derivative at (0,0));

2.x=abs(x) × sgn(x) or ABS (x) = (x )× SGN (x);

3. The domain is (-∞,+∞) and the range is {- 1, 0,1};

4.sgn is the abbreviation of English symbol.

Sogou asked.

Extended data:

Table returns an integer representing the symbol of a number.

The Sgn(number), number parameter can be any valid numeric expression.

The Sgn function has the following return values: If number is Sgn, it is greater than zero1; Equal to zero 0; Less than zero-1.

Known x

Solution: sub df () y = 2: x =1a = 0: b =-1debug. Print SGN (y = x)-SGN (a-b) end sub. The result after verification with the above code is-1. When the false value is converted to an integer, Sgn(false)=0vb is 0.

References:

Sogou encyclopedia -SGN function