BYROW

Array & Advanced

(4.8/5)

Applies a LAMBDA function to each row of an array and returns an array of results. Perfect for row-wise calculations, statistical operations, and dynamic data processing.

Interactive Formula Tester

Row Data:

Formula:

=BYROW("")

Complete Theory & Understanding

Master the fundamentals of Excel BYROW function

Core Concept

BYROW revolutionizes row-wise data processing by applying custom logic to each row through LAMBDA functions. It enables powerful array transformations and calculations without traditional loops.

Why Use BYROW?

Calculate statistics per row
Transform row data efficiently
Process multiple rows at once
Generate row-based reports

Key Characteristics

Row-Wise Processing

Independently processes each row

One calculation per row

LAMBDA Integration

Works seamlessly with LAMBDA functions

Custom logic per row

Dynamic Arrays

Returns automatically-sized arrays

Spills results down

Flexible Calculations

Any formula can be applied per row

SUM, AVERAGE, MAX, custom

Function Anatomy

=BYROW(parameters...)

Required

Parameters:

Function-specific parameters

Returns

Return Value:

Function-specific return type

Primary Use Cases

Row Summaries

Calculate statistics per row

Data Transformations

Transform row data efficiently

Batch Processing

Process multiple rows at once

Dynamic Reports

Generate row-based reports

Theory Summary

Precise

Exact matching required

Position-Based

Returns numeric position

Error-Safe

Handles missing text gracefully

Syntax & Parameters

=BYROW(array, lambda)

Required

array:

The array to apply the LAMBDA function to

Required

lambda:

A LAMBDA function that takes a row as input and returns a single value

Returns

Return Value:

An array of results from applying the LAMBDA function to each row

Description: Applies a LAMBDA function to each row and returns an array of results

Interactive Examples

Basic BYROW

Sum each row

Input Text:

"3x3 array"

Formula:

=BYROW(A1:C3, LAMBDA(row, SUM(row)))

Result:

Array of row sums

Returns the sum of each row

VBA Implementation & Automation

BYROW Alternative in VBA

VBA implementation since BYROW is not directly available

' BYROW is not available in VBA, here's an alternative
Sub BYROWAlternative()
    Dim i As Long
    Dim result As Variant
    Dim sourceRange As Range
    Set sourceRange = Range("A1:C3")
    ReDim result(1 To sourceRange.Rows.Count)
    
    ' Process each row
    For i = 1 To sourceRange.Rows.Count
        ' Apply calculation to each row
        result(i) = Application.WorksheetFunction.Sum(sourceRange.Rows(i))
    Next i
    
    ' Output results
    Range("E1:E" & UBound(result)).Value = _
        Application.WorksheetFunction.Transpose(result)
    MsgBox "BYROW alternative complete"
End Sub

' Row-wise processing with custom logic
Sub ProcessRowsCustom()
    Dim i As Long
    Dim ws As Worksheet
    Set ws = ActiveSheet
    Dim result() As Variant
    ReDim result(1 To ws.Range("A1:A100").Rows.Count)
    
    For i = 1 To 100
        ' Custom per-row calculation
        result(i) = Application.WorksheetFunction.If(
            Application.WorksheetFunction.Sum(ws.Range("A" & i & ":C" & i)) > 100,
            "High",
            "Low"
        )
    Next i
    
    ws.Range("E1:E100").Value = Application.Transpose(result)
End Sub