BESSELJ Function

Today I’m going to show you how to use an another engineering function in Excel. This new function is called Besselj. It returns the Bessel function J_n(x).

Syntax of the function is BESSELJ(x,n). So we need to input two parameters (x and n) for this function. Both are required to return a value. When you input those two arguments, function will be evaluated at x. And n is the order of the Bessel function. You can use this function in Excel like this.

Here I have used cell addresses to input the arguments. But you can also use values directly like this as well.

So now let’s find the J_n(x) values for x values from -5 to 5 when the order of the function is 1.

If we draw a graph of J_n(x) for the above values it will look like this.

If we change the order of the Bessel function to 2, then we will get the following result.

This is the graph for the above table.

How to Add a Formula to a Cell Using VBA

In this lesson you can learn how to add a formula to a cell using vba. There are several ways to insert formulas to cells automatically. We can use properties like Formula, Value and FormulaR1C1 of the Range object. This post explains five different ways to add formulas to cells. Table of contents How to add formula to cell using VBA Add formula to cell and fill down using VBA Add sum formula to cell using VBA How to add If formula to cell using VBA Add formula to cell with quotes using VBA Add Vlookup formula to cell using VBA We use formulas to calculate various things in Excel. Sometimes you may need to enter the same formula to hundreds or thousands of rows or columns only changing the row numbers or columns. For an example let’s consider this sample Excel sheet. In this Excel sheet I have added a very simple formula to the D2 cell. =B2+C2 So what if we want to add similar formulas for all the rows in column D. So the D3 cell will have the formula

Download a file from url using VBA

Sometimes our Excel VBA applications need to interact with websites. Downloading a file through a URL is a typical example. In this lesson you can learn how to do that using XMLHttpRequest and ADODB.Stream object. XMLHttp is used to request the data from the web server. Once we receive the data from the server, the ADODB.Stream object is used to write that data to a file. You can use this method to download file types such as image files, csv files etc. So let’s start writing our macro to download a file using the Uniform Resource Locator (URL). Let’s name our Sub procedure as “DownloadFileFromURL” Sub DownloadFileFromURL() End Sub First we need to declare a few variables. Dim FileUrl As String Dim objXmlHttpReq As Object Dim objStream As Object Next assign the URL of the file to the FileUrl variables FileUrl = "URL of your file" For an example if your file URL is https://www.example.com/images/chart.jpg then you can assig

Fill a Listbox From an Array

In this lesson you will learn how to fill a Listbox from an array. Listboxes are a very useful control type available in the VBA toolbox. You can use the listboxes for search and view functions of the VBA programs. First let’s fill the listbox using a multidimensional array. After that we can try it with a one dimensional array. This is the sample Excel sheet I’m going to use for this lesson. And here is the listbox we are going to fill with the array. So we have data in three columns and fourteen rows. First, we are going to add this data to an array. After that we can add the array to our listbox in the VBA form. You might wonder why we need to add the data to an array. Because data can be directly added to the listbox from the worksheet using VBA. Yes it is possible. But here our objective is to learn how to add data to a listbox from an array. Because there are situations where we need to add the data which is not available in worksheets to listboxes using VBA. For

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