how to separate number

I want to know how to separate 2024 into 2 and 0 and 2 and 4. I already know how to do num2str-'0'. However, it cannot be used because there is a gap. Please help me.

[Voss]

Where is a gap?

[윤호]

function v = MySecret( y ) 
v=unique(num2str(factor(y))-'0')

If y=2024, the value is output as -16 1 2 3. But what I want is 1 2 3.

[윤호]

This is a question.

Write a function v = MySecret(y) that returns a vector v that arranges each number that comes out in ascending order when a number y is prime factorized.

Use Examples

>> v = MySecret(2024)

v =

1 2 3

If we sub-factorize 2024 given as an argument, it is 2x2x2x11x23, so the numbers used are 1, 2, and 3.

[Voss]

Sounds like they are asking for numbers (2, 11, 23) not digits (1, 2, 3).

Answer 1

[Voss]

function v = MySecret( y ) 
str = num2str(factor(y));
str(str == ' ') = []; % remove spaces
v = unique(str-'0');

[윤호]

Is there anything smaller in size?

I want an extremely small code.

[Voss]

Fewer lines:

function v = MySecret( y )
str = num2str(factor(y));
v = unique(str(str ~= ' ')-'0');

Fewer lines still:

function v = MySecret( y )
v = unique(strrep(num2str(factor(y)),' ','')-'0');

[Voss]

If they want the prime factors, rather than their digits, then of course it's just:

function v = MySecret( y ) 
v = unique(factor(y));