Difference between revisions of "Documentation/How Tos/Calc: SUMPRODUCT function"
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<tt>'''SUMPRODUCT((A1:A6="red") * (B1:B6="big") * C1:C6)'''</tt> | <tt>'''SUMPRODUCT((A1:A6="red") * (B1:B6="big") * C1:C6)'''</tt> | ||
:a version of <tt>'''SUMPRODUCT(A1:A6="red"; B1:B6="big"; C1:C6)'''</tt> which is portable to Excel, as the logical values are converted to numbers during the multiplication. | :a version of <tt>'''SUMPRODUCT(A1:A6="red"; B1:B6="big"; C1:C6)'''</tt> which is portable to Excel, as the logical values are converted to numbers during the multiplication. | ||
| + | |||
| + | === Issues: === | ||
| + | *In Excel SUMPRODUCT ignores [[Documentation/How_Tos/Calc: Logical functions#Logical values overview|logical values]] (that is, it treats them as 0). In Calc <tt>'''TRUE'''</tt> is 1 and <tt>'''FALSE'''</tt> is 0. | ||
{{Documentation/SeeAlso| | {{Documentation/SeeAlso| | ||
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* [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | * [[Documentation/How_Tos/Calc: Functions listed alphabetically|Functions listed alphabetically]] | ||
* [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | * [[Documentation/How_Tos/Calc: Functions listed by category|Functions listed by category]]}} | ||
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Revision as of 08:27, 3 March 2009
SUMPRODUCT
Returns the sum of the products of corresponding array elements.
Syntax:
SUMPRODUCT(array1; array2; ... array30)
- array1 to array30 are up to 30 arrays or ranges of the same size whose corresponding elements are to be multiplied.
- SUMPRODUCT returns
for the i elements in the arrays.
- You can use SUMPRODUCT to calculate the scalar product of two vectors.
- Advanced topic:
- SUMPRODUCT evaluates each parameter array1 to array30 as an array formula but does not need to be entered as an array formula. In other words it can be entered with the Enter key, rather than Cntrl-Shift-Enter. See the example below.
- SUMPRODUCT can also be used to sum cells where a specified condition is true - see Conditional Counting and Summation and the example below.
Example:
SUMPRODUCT(A1:B2; F1:G2)
- returns A1*F1 + B1*G1 + A2*F2 + B2*G2.
Advanced topic:
SUMPRODUCT(ABS(A1:A6))
- when entered 'normally' (not as an array formula), returns the sum of the absolute values in cells A1:A6. SUMPRODUCT forces ABS(A1:A6) to be evaluated as an array formula.
SUMPRODUCT(A1:A6="red"; B1:B6="big"; C1:C6)
- returns the sum of cells in C1:C6 whose corresponding entries in the A column are red and in the B column are big. This is not portable to Excel, as Excel ignores logical values.
SUMPRODUCT((A1:A6="red") * (B1:B6="big") * C1:C6)
- a version of SUMPRODUCT(A1:A6="red"; B1:B6="big"; C1:C6) which is portable to Excel, as the logical values are converted to numbers during the multiplication.
Issues:
- In Excel SUMPRODUCT ignores logical values (that is, it treats them as 0). In Calc TRUE is 1 and FALSE is 0.
