Every months I have to write some macros in Excel. In the latter part of the article, I give a few code examples for performing common tasks required by Excel macros. Variant essentially means any type; if you want to limit the formula to return a specific type, you can change it, eg.
Learning VBA in Excel
As you can see above, you set the result return value of the formula by assigning it to the function name itself, ie. Notice that the function declaration uses parentheses Variant after the type specifier to denote that we will be returning multiple values.
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The input value the formula accepts go in the function definition. For example, to pass a string:. Notice that you can use cell references when you place the formula, eg. If the cell values cannot be converted, a type mismatch error will occur. Notice this will refer to the currently active worksheet see below for how to access any worksheet. Note the use of square brackets to denote that the column is part of a table.
Creating a Macro by Coding
To fetch the whole table:. Note: You can name a table in the Design tab of the ribbon when any cell in the table is selected. Oftentimes you will want to retrieve the actual row and column numbers of a cell or the start of a range so that you can refer to adjacent cells. To kick off, if you have a row and column number already and want to get the cell reference, use:. Note that cells are numbered from 1,1 as the top-left corner of a worksheet.
In fact, all operations in Excel VBA are 1-indexed meaning that iterating over a group of items starts at 1, not 0 as is the case in many other languages.
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Note that when you retrieve these row and column numbers, they are relative to the top-left of the entire worksheet, not the range. Fortunately, this is usually what you want. Armed with this information, we can now look at the cells around a cell reference. Suppose we have a formula where we pass a single cell reference from part of a table, perhaps a product name, and we want to look up the price of the product. We can find out the row number of the product, and — if we use a named range — the column number of the price column.
Using these two values together, we can find the price of the product:. Any worksheet function can be used, but as you can see above, the arguments must be passed in terms of VBA cell references and values. Sometimes you will want to do a test before continuing with the formula, and exit with a different value if the test succeeds or fails. For example:. This function exits early if the value of the passed cell is not , otherwise it continues executing the formula.
If statements do not require outer brackets in VBA. There is no equivalent of the ternary operator in VBA, however you can easily replicate it by using a function such as:. The syntax is as follows:. Error handling is surprisingly important when dealing with Excel formulas. If you have a formula that is called frequently and keeps failing, you can end up with memory leaks, crashed spreadsheets and ultimately your whole computer grinding to a halt. There are several error handling statements and they can be placed anywhere in a function to change the currently active error handling scheme.
Here is a common use case:. Note the use of the colon at the end of this statement. Instead, you can do this:. This cannot be done with a standard worksheet function. You can either use two one-dimensional arrays: one for the rows and one for the column, or you can use an array of ranges containing a single cell each. We have an array of the row numbers of each cell to test in this column, stored in TestRows. You can iterate over all the cell values as follows:.
You can merge various ranges together. I literally just added that as a comment above. Why didn't I think of to do this sooner? So, to apply this. Say, I take actionName into another sub like this: Sub macro sleep actionName sleep Is that it? And that both Copy needs to be in the same module as macro right?
Ah, it works so beautifully! I put the copy in another module and then in macro I called like this call copy. Thank you very much.
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Yes to your first comment. As far as being in the same module, it doesn't have to be.
You can call a sub in another module, provided it's not declared Private. Sign up or log in Sign up using Google. Sign up using Facebook.
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