VBA & Macro Problems

How to Declare VBA Arrays for a Stock Price Matrix in Spreadsheets

Huda Qurayshi Sep 28, 2026 869 views

Question details

The user needs to correctly declare and initialize variables and dynamic arrays in VBA to construct an n-by-n stock price matrix using a binomial pricing model.

How to Declare VBA Arrays for a Stock Price Matrix

Product: Spreadsheets
Device & OS: not provided
Scenario: Building a financial binomial model in a spreadsheet environment that relies on VBA macros to compute dividend totals and stock matrices.
Observed behavior: To successfully execute the financial model, dynamic arrays such as Tau, Div, Rate, temp, and S must be properly declared and resized using ReDim before calculating values.

Before you start

Ensure that the Developer tab is enabled in your spreadsheet software and that your macro security settings are configured to allow VBA code execution.

Solution 1Recommended

Declare and Resize Dynamic VBA Arrays for the Binomial Model

Use Dim for static variables and ReDim for dynamic arrays to handle variable dividend counts and matrix dimensions during runtime.

Financial models often rely on dynamic inputs, meaning the size of your arrays cannot be hard-coded. Using dynamic arrays ensures that memory is allocated based on the actual number of periods (n) and dividends.

Declare Static Variables and Arrays

Open the VBA Editor (Alt + F11) and use the 'Dim' statement to declare model parameters, loop counters, and dividend totals. For dynamic arrays like Tau, Div, Rate, temp, and S, declare them with empty parentheses (e.g., Dim Div() As Double).

Resize Dividend Arrays

Once the dividend count is determined by your code or user input, use the 'ReDim' statement to size the dividend arrays accordingly (e.g., ReDim Div(1 To divCount)).

Size the Stock Matrices

Use 'ReDim' to define the dimensions of your temporary and final stock price matrices based on the number of periods (n). Set the size as an n-by-n matrix, such as ReDim S(1 To n + 1, 1 To n + 1).

Initialize and Compute

Set the initial values for your resized arrays. Loop through your binomial logic to calculate the temporary stock matrix, and then build the final stock price matrix by calculating and adding the discounted dividends.

Declare and Resize Dynamic VBA Arrays for the Binomial Model

Preserving Array Data: If you need to resize a dynamic array later in your script without erasing the data it already contains, use the 'ReDim Preserve' keyword.

Advanced VBA Support

Build Complex VBA Financial Models with WPS Spreadsheets

WPS Spreadsheets provides robust support for VBA macros, allowing you to seamlessly run and edit complex financial models like binomial stock pricing matrices.

1. Download and Install WPS Office: Get WPS Office from the official website and install it on your device.
2. Open Your Macro-Enabled Workbook: Launch WPS Spreadsheets and open your existing .xlsm file containing the financial model.
3. Access the VBA Editor: Navigate to the Developer tab on the ribbon and click on the 'VBA Editor' icon.
4. Write or Paste Your VBA Script: Insert your dynamic array declarations and binomial model code directly into the VBA module.
5. Run the Macro: Click 'Run' or trigger the macro from your spreadsheet to generate the final stock price matrix.

High compatibility with Microsoft Excel VBA syntax and macro-enabled files (.xlsm).Advanced calculation engine designed to handle large n-by-n data matrices smoothly.Free and lightweight spreadsheet software featuring a familiar user interface.

microsoft office alternative - wps office

Frequently Asked Questions

What is the difference between Dim and ReDim in VBA?

Dim is used to declare variables and set fixed-size arrays at the time of writing the code. ReDim is used during runtime to resize dynamic arrays when their exact dimensions, such as a specific dividend count, become known.

Why do I get a 'Subscript out of range' error when building my matrix?

This runtime error typically occurs when your script attempts to access an array index that has not been properly allocated using ReDim, or if a loop exceeds the dimensions you specified (e.g., trying to access index n+2 in a matrix sized 1 To n+1).

Can I run my Excel binomial model VBA code in WPS Office?

Yes, the professional versions of WPS Spreadsheets support VBA. You can open your macro-enabled Excel workbooks (.xlsm) in WPS and run your existing financial modeling scripts without modifying the array logic.

Excel & Data Problems