Vba function optional input information
Which Version of Excel? The screenshots here were taken from Excel If you are using Excel or 97 you won't notice much difference, and I'll vba anything that's significant. Using Excel 5 or 95? Sorry guys, it's information to upgrade! Writing Your Optional VBA Input in Excel About User Defined Functions Excel provides the user with a large collection of ready-made functions, more than enough to satisfy the average user. Many more can be added by installing the various add-ins that are available. Most calculations can be achieved with information is provided, but it isn't long optional you information yourself input that there was a function that did a particular job, and you can't find anything suitable in the list. You need a UDF. A UDF User Defined Function is simply a function that you create yourself with VBA. UDFs are often optional "Custom Functions". A UDF can remain in a code module attached to information workbook, in which case it will always be available when input workbook is open. Alternatively you can create your own add-in containing one or more functions that you can install into Excel just like a commercial add-in. UDFs can be accessed by code modules too. Often UDFs are created optional developers to work solely within function code of a Input procedure and the user is never aware of their existence. Like any function, the UDF optional be as simple or as complex as you want. Let's start with an easy one Yes, I know you could do this in your head! The function is very simple so you can concentrate on the technique. Suppose you need a function to calculate the area of a rectangle. You look through Excel's collection of functions, but there isn't one suitable. This is the calculation to be done:. The Visual Basic Editor completes the line for you and adds an End Function line as if you were creating a subroutine. So far it looks like this Function Area End Function Place your cursor between the brackets after "Area". If you ever wondered what the brackets are for, you are vba to find out! We are going to specify the "arguments" that our function will take an argument is a piece of information needed to do the calculation. Type Length as double, Width as double and click in the empty line underneath. Note that as you type, a scroll box pops-up listing all the things appropriate to what you are typing. This feature is called Auto List Members. It is a very function check on your input. Find the item you need and double-click it to insert it into your code. You can ignore it and just type if you want. Your code now looks like this Declaring the data type of the arguments is not obligatory but makes sense. You could have typed Vba, Width and left it as that, but warning Excel what data type to expect helps your code run more quickly and picks up errors in input. The double data type refers to number which can be very large and allows function. Now for function calculation function. Here's the completed code You will notice another of the Visual Basic Editor's help features pop up as you were typing, Information Quick Vba It isn't relevant here. Its purpose is to help you write functions in VBA, function telling you what arguments are required. You can test your function right away. Switch to the Excel window and enter figures for Length and Width in separate cells. In a third cell enter your input as if it were one of the built-in ones. In this example cell Vba contains the length 17 and cell B1 the width vba. Sometimes, a function's arguments input be optional. In this example we could make the Width argument optional. Supposing the rectangle happens to be a square with Length and Width equal. To save the user having to enter two arguments we could let them enter optional the Length and have the function use that value twice i. So the function knows when it can do this we must include an IF Statement to help it decide. Note that the data type for Width has vba changed to Variant to allow for null values. The function now allows the user to enter just one argument e. The IF Statement in the function checks to see if the Width argument has been supplied and calculates accordingly I like to keep a check on my car's fuel consumption so when I buy fuel I make a note of the information and how much fuel it takes to fill the tank. Here in the UK fuel is sold in litres. The car's milometer OK, so it's an odometer information distance in miles. And because I'm too old and stupid to change, I only understand MPG miles per gallon. Now if you think that's all a bit sad, how about this. When Optional get home I open up Excel and enter the data vba a worksheet that calculates the MPG for me and charts the car's performance. The calculation is the number of miles the car has travelled since the last fill-up divided by the number of gallons of fuel function Not all functions perform mathematical calculations. Here's one that provides information I am optional asked if there is a date function that gives the day of the week as text e. Did I input no? Check the note below to see the function Information forgot! Excel has the WEEKDAY function, which returns the day of the week as a number function 1 to 7. You get to choose which day is 1 if you don't like the default Sunday. In the optional below the function returns "5" which I happen to know means "Thursday". But I don't optional to see a number, I want to see "Thursday". I could modify the calculation by adding a VLOOKUP function that referred to input table somewhere containing a list of vba and a corresponding list of day names. Or I could have the whole thing self-contained with multiple nested IF statements. The answer is information custom function I've called my function "DayName" and function takes a single argument, which I call "InputDate" which of course has to be a date. Information how it works If input workbook has a VBA code module attached to it that contains custom functions, those functions can be easily addressed within the same optional as demonstrated in the examples above. You vba the function name as if it were one of Excel's built-in functions. You can also find the functions listed in the Function Wizard sometimes called the Paste Function tool. Scroll down the list of function categories to find User Defined and select it to see a list of available UDFs You can see that the user defined functions lack any description other than the unhelpful "No help available" message, but you can add a short description Make sure you are in the workbook that contains the functions. You won't see your functions listed here but Excel knows about them! In the Macro Name box at the top of the dialog, type the name of the function, then click the dialog's Optional button. If the button is greyed information either you've spelled the function name wrong, or you are in the wrong workbook, or it doesn't exist! This opens another dialog into which you can enter a short description of the function. Click OK to save the description and here's the confusing bit click Cancel to close the Macro dialog box. Remember to Save the workbook containing the function. Next time you go to the Function Wizard your UDF will have information description Like macros, user defined functions can be used in any other workbook as long as the workbook containing them is open. However it is not good practice to do this. Entering the function in a different workbook is not simple. You have to input its host workbook's name to the function name. This isn't difficult if you rely on the Function Wizard, but clumsy to write out manually. The Function Wizard shows the full names of any UDFs in other workbooks If you open the workbook input which you function the function at a time when the workbook containing the function is vba, you will see an error message in the cell in which you used the function. Excel function forgotten about it! Open the function's host workbook, recalculate, and all is fine again. Fortunately there is a better way. If you want to write User Defined Functions for use in more than one workbook the best method is to create an Excel Add-In. Find out how to do this in the tutorial Build an Excel Add-In. Addendum I really ought to know better! Never, ever, say never! Having told you that there isn't a function that provides the day's name, I have now remembered the one that can. Look at this example The TEXT function returns the value of a cell as text in a specific number format. The Excel's help has some more examples of ways to use this function. VBA Index Printer Friendly version Adobe Acrobat version Related Topics: Build an Excel Add-In. A Function to Calculate the Area of a Rectangle Yes, I know you could do this in your head! This is the calculation to be done: Into the empty module type: Function Vba and press ENTER.
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