Spreadsheet Models for Managers
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Spreadsheet Models for Managers
Session 14
Using Macros II
Summary of Pages
As we’ve seen, function macros are macros that return values. They correspond to Excel’s family of worksheet functions, and provide a way for you to add capability transparently to the user. In the previous session, we looked at function macros that return a single value — scalar function macros. In this session, we’ll examine array function macros — macros that return a rectangular array of values. Convolution is an example of such a macro.
To deal with array macros, we’ll have to learn about iteration and dynamic arrays — two techniques that are fundamental to manipulating arrays of data.
Array macros give you a means of handling blocks of data with a single macro, which, when combined with the array manipulation techniques we used early in the course, can dramatically simplify your spreadsheet models.
Below is a summary of pages for Session 14.
- Review of Last Time
- Array function macros
- Example 1: Add two 3x3 arrays
- Arraysum: how to build it
- Arraysum: create the answer array
- How to use iteration
- Now iterate through the argument array
- Example 2: Multiply an array by a constant
- Now build a macro to do this
- Dynamic arrays
- Create the answer array
- Iterating through the argument array
- Finally, return the value
- More useful example
- Hose coupling data
- Unwinding the brass content data
- Now build the macro
- Overall approach
- Planning the iteration
- Finally
- Limitations of Vlineup
- Dynamic unwinder
- Resize and offset
- A tip about arrays
- The main points
- Reference readings
- Preview of Next Time
Links to other materials for Session 14.
Last Modified: Wednesday, 27-Apr-2016 04:15:26 EDT
The value of a function macro increases with frequency of use, the complexity of the calculation it performs, and the area of the result it returns. As you examine the computations you perform routinely in your work, make note of those computations that meet these criteria. Before committing yourself to writing a macro to carry out one those computations, try various methods for implementing it using standard built-in worksheet functions. That effort might clarify for you the kernel of the computation that benefits most from a macro-based approach.