  ## Word VBA Creating Equations

In this article I will explain how you can create equations using VBA for word.

## Step 1, Getting the Text String Associated with the Equation:

The first step for creating an equation in VBA for word is to determine the text string associated with that equation. You might not have noticed but equations in word are a basic text string. For example take a look at the the equation below: If you copy the equation and paste it in a notepad this is what you get: The text in the notepad might seem like nonsense, but the word editor understands this. In order to create equations in word using VBA, we too will have the create the text string above.

The text above can be converted back to a word equation by following the steps below:

Step 1: Copy the text in the notepad editor and paste it in an empty word document: Step 2: Select the text in the word document and click on the “Insert Equation” button on the “Insert” tab Step 3: Choose professional View: As you can see the equation was created from the text string in the notepad file. So basically we need to be able to generate the text string in the notepad file to create the equation in word.

I will explain this in more detail in the following sections.

## Step 2:

The next step for creating an equation is to move the cursor to the location you want to insert the equation.For more information about moving the cursor around the document please see the links below:

## Creating Simple Equations :

Equations can be made using the code below:

`Sub Example1() Dim objRange As Range Set objRange = Selection.Range objRange.Text = "y = x^2+1" Call OMaths.Add(objRange) End Sub ` Note: If you want to keep reference to the newly created equation you could use the code below. You could then change the display to professional so it looks like a real equation:

`Sub Example2() Dim objRange As Range Dim objOMath As OMath Set objRange = Selection.Range objRange.Text = "y = x^2+1" Set objOMath = OMaths.Add(objRange).OMaths.Item(1) objOMath.BuildUp End Sub ` ## Creating Complex Equations:

For more complex equations you can’t simply paste the text string in the VBA editor. For example lets say we want to create the equation explained at the start of the post. The first step would be to replace the text :

• “y = x^2+1”

with

• “f(x)=a_0+∑_(n=1)^∞▒(a_n cos⁡〖nπx/L〗+b_n sin⁡〖nπx/L〗 ) “

But this is what will happen if we try to make this replacement:

`Sub Example1() Dim objRange As Range Set objRange = Selection.Range objRange.Text = _ "f(x)=a_0+?_(n=1)^8n(a_n cos??npx/L?+b_n sin??npx/L? ) " Call OMaths.Add(objRange) End Sub `

As you can see a lot of the characters are not recognized by the VBA editor and are replaced by a “?” character. The solution to this is explained in the steps below:

Step 1: Break the text string into different segments, separating the “?” characters:

`"f(x)=a_0+" + ? + "_(n=1)^8n(a_n cos"+ ?? + _ "npx/L" + ?+ "+b_n sin' + ?? + "npx/L" +? +" ) " `

Step 2: Find the unicode value associated with the missing characters. The missing characters are:

I have written a program which returns the unicode value associated with characters. You can download the program at the link below and use it to find the unicode values associated with each of the characters above:

Step 3: Replace the “?” characters with the `ChrW()` function. The `ChrW()` function receives as input a unicode value and returns the character associated with it:

`Sub Example3() Dim objRange As Range Dim objOMath As OMath Set objRange = Selection.Range objRange.Text = _ "f(x)=a_0+" + ChrW(8721) + "_(n=1)^8" + ChrW(9618) + _ "(a_n cos" + ChrW(12310) + "npx/L" + ChrW(12311) + _ "+b_n sin" + ChrW(12310) + "npx/L" + ChrW(12311) + " )" Set objOMath = OMaths.Add(objRange).OMaths.Item(1) objOMath.BuildUp End Sub `

Result: If you need assistance with your code, or you are looking for a VBA programmer to hire feel free to contact me. Also please visit my website www.software-solutions-online.com

## 4 thoughts on“Word VBA Creating Equations”

1. Kikou says:

Hello,
Thank you for the code
I need to use your code but for Visual Basic 2010 Express
I tried to turn it, here’s the code :

Imports System.IO
Imports Word = Microsoft.Office.Interop.Word
Public Class Form1
Dim oWord As New Word.Application
Dim oDoc As Word.Document
Dim oPara1 As Word.Paragraph
Dim objOMath As Word.OMath
Dim cheminPlusFichier As String
Private Sub Creer()
SaveFileDialog1.Filter = “Document Word (*.docx)|*.docx”
SaveFileDialog1.Title = “Enregistrer sous”
SaveFileDialog1.FileName = “Notes de calcul”
If SaveFileDialog1.ShowDialog() = DialogResult.OK Then
cheminPlusFichier = SaveFileDialog1.FileName
System.IO.File.WriteAllBytes(cheminPlusFichier, My.Resources.Note_de_calcul)
End If
cheminPlusFichier = SaveFileDialog1.FileName
oDoc = oWord.Documents.Open(SaveFileDialog1.FileName)
oWord.Visible = True
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Creer()
oPara1.Range.Text = _
“f(x)=a_0+” + ChrW(8721) + “_(n=1)^8” + ChrW(9618) + _
“(a_n cos” + ChrW(12310) + “npx/L” + ChrW(12311) + _
“+b_n sin” + ChrW(12310) + “npx/L” + ChrW(12311) + ” )”
objOMath.BuildUp()
End Sub
End Class

but its not working
the equation is displayed as:
f(x)=a_0+∑_(n=1)^8▒(a_n cos〖npx/L〗+b_n sin〖npx/L〗 )
and it displays the following error:

if you can help me that would be cool

2. Evan Siegel says:

How about writing a system of equations. Like:
3x + 2y = 14
4x – 7y = 11
?

1. Bruno Garnier says:

Just add as linear text the following formula :
{█(3x+2y=14@4x-7y=11)┤

3. Evan Siegel says:

Or matrices? 