What does -- do in Excel formulas?

Trying to decipher some Excel formulas and I see some stuff like SUMPRODUCT(--Left(...)...)

What is the -- doing? Naturally seems like decrementing to me but couldn't find any documentation on it.

The double-dash is known as a double unary operator.

Try this link: Why use -- in SUMPRODUCT formulae

Specifically:

SUMPRODUCT() ignores non-numeric entries. A comparison returns a boolean (TRUE/FALSE) value, which is non-numeric. XL automatically coerces boolean values to numeric values (1/0, respectively) in arithmetic operations (e.g., TRUE + 0 = 1).

The most efficient way to coerce the value is first to apply the unary minus operator, coercing TRUE/FALSE to -1/0, then applying it again to negate the value, e.g., +1/0.

A single unary operator (-) coerces true/false values into -1/0. By using the double unary operaor, we coerce the values again to 1/0.

Why two minus signs "--" in an excel formula?, Why two minus signs "--" in an excel formula? Using two minus signs next to each other causes the formula to convert a return value of� Each cell in Excel has a unique address. Each cell is located in a specific Worksheet (or tab) within a Workbook (or Excel file). The full identifier of a cell would include the name of the Workbook, the name of the Worksheet and the address of th

The unary operator (-) is a shorthand method to convert a true/false statement into -1/0.

A single operator will convert -(true) into -1, so a double unary operator is used to convert that back into 1:

-(-(true)) = -(-(1)) = 1
-(-(false)) = -(-(0)) = 0

What does -- do in Excel formulas?, A single unary operator (-) coerces true/false values into -1/0. By using the double unary operaor, we coerce the values again to 1/0. The unary operator (-) is a shorthand method to convert a true/false statement into -1/0. Using references in Excel formulas A reference identifies a cell or a range of cells on a worksheet, and tells Excel where to look for the values or data you want to use in a formula. You can use references to use data contained in different parts of a worksheet in one formula or use the value from one cell in several formulas.

I've been using SUMPRODUCT for a while and have always used the * symbol instead of the --. I'm sure I asked the same question you've asked, but I can't remember the reason they gave me, but I was told that there wasn't really a need for --as sumproduct managed itself quite well without the it.

Anyway, =sumproduct(()*()*()*()) has always worked for me, and it's less confusing.

The double negative in Excel formulas, The 2 FALSE values are for "Apple" and "Pear". Now, if we drop that expression into SUMPRODUCT to count the TRUE results, what do we get? = SUMPRODUCT� Improve Formulas with Cell References . Excel formulas can also be developed using cell references. Continuing with our example, you would not enter the numbers 3 and 2, but instead would name cells where these numbers have been entered (see Using Cell References below for more on cell naming). When you write a formula this way, the formula

Boolean values TRUE and FALSE in excel are treated as 1 and 0, but we need to convert them. To convert them into numbers 1 or 0, do some mathematical operation. The Unary operator negates the boolean (math operation), hence, converts the boolean to number. Same works in TRUE * FALSE = 0

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Comments
  • -- can coerce a single array at a time.