Excel FunctionsExcel Functions

Part 1. Introduction

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An Excel function is a formula or a procedure that is performed in the Visual Basic environment, outside the Excel spreadsheet.

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For example, the sum of two variables can be evaluated in an Excel spreadsheet as follows:

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Sum x + y

  x = 5

  Y = 3

Sum = 8

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Sum of two variables in an Excel spreadsheet

This same sum can be done in the environment of Visual Basic (VB)

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You can define a function called "Sum", which receives the You can define a function called "Sum", which receives the value of two inputs "x" and "y" and returns the value of value of two inputs "x" and "y" and returns the value of the sum of themthe sum of them

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How to build the function "Sum"How to build the function "Sum"

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- Click on the "Programmer" tab- Click on the "Programmer" tab

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- Click on the "Programmer" tab- Click on the "Programmer" tab

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If the tab is not available, see Note 1 "Activate tab" at the end of the document.

- Click on the "Programmer" tab- Click on the "Programmer" tab

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Click on "view code"Click on "view code"

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The "Visual Basic" ambient is openThe "Visual Basic" ambient is open

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Function code

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Function code

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The codes are written in the VB "Modules"

Function code

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The codes are written in the VB "Modules"

To open a module

Function code

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The codes are written in the VB "Modules"

To open a module

Click right button on the left side window

Function code

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The codes are written in the VB "Modules"

To open a module

Click right button on the left side window

It opens a window

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Select “Insert”

Click Module

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Appears the new created VB module, with the name Module1.

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This name can be changed later by a more suitable one.

The right window displays a flashing line

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The right window displays a flashing line

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The module is now ready for use

Sum Function Code

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Código de la función Suma

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In the right window type the function name followed by the dependent variables.

Código de la función Suma

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In the right window type the function name followed by the dependent variables

Function Suma(x,y)

Código de la función Suma

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In the right window type the function name followed by the dependent variables.

Function Suma(x,y)

When you "Enter", VB automatically puts the final line of the function.

Sum Function Code

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In the right window type the function name followed by the dependent variables.

Function Suma(x,y)

End Function

The new code must be written between these two commands.

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The new code must be written between these two commands.

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In this case, the code consists of a single line

The new code must be written between these two commands.

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In this case, the code consists of a single line

Suma = x + y

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The complete function looks like

 x = 5Y = 3

Sum =  =SUMA(C5,C6)Sum = 8

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Application of the Sum function in the Excel spreadsheet

End of Part 1. Introduction

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Activating the "Programmer" tab

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Activating the "Programmer" tab

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Nota 1

To activate the “Programmer” tab

1. Click the File tab.

2. Under Help, click Options.

3. Click Customize Ribbon.

4. Select the Developer check box.