This function groups an array by rows by application of a LAMBDA function to each row.
Sample Usage
BYROW(A1:C3,LAMBDA(row,MAX(row)))
BYROW(A1:C3,LAMBDA(row,SUM(row)))
Syntax
BYROW(array_or_range,LAMBDA)
array_or_range: The array or range to group by rows.LAMBDA: ALAMBDAthat’s applied to each row in the given array or range to obtain its grouped value.- Syntax:
LAMBDA(name,formula_expression) - Requirements:
- The
LAMBDAmust have exactly 1nameargument along with aformula_expressionwhich uses thatname. Thenameresolves to the current row being grouped when theLAMBDAis applied.
- The
- Syntax:
Notes
- The passed
LAMBDAshould accept exactly 1nameargument, otherwise an#N/Aerror is returned. This argument corresponds to a row in the input array. - Every row should be grouped to a single value. Array results for grouped values aren’t supported.
- A
named functioncan be passed for theLAMBDAparameter and behaves like aLAMBDAin this case. Learn more about named functions.- There should be exactly 1 argument placeholder defined for it.
- Parenthesis shouldn't follow the
named function.
Examples
Sum row-wise
Example Data:
|
A |
B |
C |
|
|---|---|---|---|
|
1 |
3 |
5 |
7 |
|
2 |
4 |
3 |
5 |
|
3 |
1 |
2 |
4 |
Example: =BYROW(A1:C3,LAMBDA(row,SUM(row)))
Result:
|
15 |
|
12 |
|
7 |
Filters years where any quarterly sales exceeded 1300
Example data:
|
A |
B |
C |
D |
E |
|
|---|---|---|---|---|---|
|
1 |
Q1 |
Q2 |
Q3 |
Q4 |
|
|
2 |
2019 |
1060 |
295 |
1425 |
280 |
|
3 |
2020 |
270 |
585 |
675 |
170 |
|
4 |
2021 |
285 |
1200 |
780 |
1235 |
|
5 |
2022 |
1440 |
1390 |
45 |
650 |
Example:=FILTER(A2:A5,BYROW(B2:E5,LAMBDA(row,MAX(row)>1300)))
Result:
|
2019 |
|
2022 |
Returns a 3x1 array with the difference between max and min value of each row using a named function as LAMBDA
Example data:
|
A |
B |
C |
|
|---|---|---|---|
|
1 |
3 |
5 |
7 |
|
2 |
4 |
3 |
5 |
|
3 |
1 |
2 |
4 |
Example: =BYROW(A1:C3,MAX_MIN_DIFF)
Named function: MAX_MIN_DIFF is a named function which outputs the difference between the maximum value and the minimum value.
Formula definition: =MAX(row)-MIN(row), where row is an argument placeholder defined for MAX_MIN_DIFF.
Result:
|
4 |
|
2 |
|
3 |
Common Errors
The passed LAMBDA doesn’t have exactly 1 name argumentIf the passed LAMBDA doesn’t have exactly 1 name argument, and 1 formula expression as an argument, this error occurs:
“Wrong number of arguments to LAMBDA. Expected 1 argument, but got 2 arguments.”
Example: =BYROW(C1:C4,LAMBDA(a,b,a+b))
For this example, LAMBDA was given 2 name arguments when it only needs 1.
If the last parameter of BYROW wasn’t a LAMBDA, this error occurs:
“Argument must be a LAMBDA.”
Example: =BYROW(C1:C4,4)
If 1 or more name arguments weren’t valid, this error occurs:
“Argument 1 of function LAMBDA is not a valid name.”
Example: =BYROW(C1:C4,LAMBDA(C1, C1+1))
For this example, C1 is an invalid name since it clashes with a range.
If the application of LAMBDA on the input array doesn’t group each row to a single value, this error occurs:
“Single value expected. Nested array results are not supported.”
Example: =BYROW(C1:E1,LAMBDA(row,row))
Related functions
- LAMBDA function: This function lets you create and return a custom function with a set of
namesand aformula_expressionthat uses them. - MAP function: This function maps each value in the given arrays to a new value.
- REDUCE function: This function reduces an array to an accumulated result.
- BYCOL function: This function groups an array by columns.
- SCAN function: This function scans an array and produces intermediate values.
- MAKEARRAY function: This function creates a calculated array of specified dimensions.
- Create & use named functions: This function lets you create and store custom functions, similar to
LAMBDA.
