As you can see I have not used the "Compare node" to choose the positions greater than zero but the "separate XYZ" node has already done that why is this happening?
I was following a tutorial where he was using the Compare node to have the same result as mine.
why did he do that?
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Orange in Dark
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There's a socket mismatch: you connect a scalar AKA float AKA value to a boolean, therefore an implicit conversion happens. You can read about those here – Markus von Broady Jan 20 '24 at 12:06
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@MarkusvonBroady Thank you – Orange in Dark Jan 20 '24 at 12:53
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@MarkusvonBroady Would you please help me to understand this -> what is the meaning of -0.000 in the spreadsheet? what's its difference with 0.000? – Orange in Dark Jan 20 '24 at 13:18
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There's no difference except some information on where that value comes from: multiply $1$ by $0$ and you get $0$. Multiply $-1$ by $0$ and you get $-0$. Mathematically this is the same number, also if you use a node like e.g. Math: Sign, it will return $0$ for either of the two zeros (and it will return $-1$ for negative numbers, and $+1$ for positive numbers). Comparing $-0$ and $+0$ yields True. This behavior is correct based on IEEE-754 standard that C++ uses, and Blender is programmed in C++. – Markus von Broady Jan 20 '24 at 13:28
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The only way to differentiate $-0$ from $+0$ that I know of is to convert it to a string and check the length of the string. – Markus von Broady Jan 20 '24 at 13:30
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@MarkusvonBroady Thank you – Orange in Dark Jan 20 '24 at 13:33