Spreadsheet Models for Managers

Getting Access to Spreadsheet Models for Managers

If Spreadsheet Models for Managersyou use Excel to model businesses, business processes, or business transactions, this course will change your life. You’ll learn how to create tools for yourself that will amaze even you. Unrestricted use of this material is available in two ways.

As a stand-alone Web site
It resides on your computer, and you can use it anywhere. No need for Internet access.
At this Web site
If you have access to the Internet whenever you want to view this material, you can purchase on-line access. Unlimited usage. I’m constantly making improvements and you’ll get them as soon as they’re available.

To Order On Line

Order "Spreadsheet Models for Managers, on-line edition, one month" by credit card, for USD 69.95 each, using our secure server, and receive download instructions by return email.
Order "Spreadsheet Models for Managers, on-line edition, three months" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.
Order "Spreadsheet Models for Managers, downloadable hyperbook edition" by credit card, for USD 199.00 each, using our secure server, and receive download instructions by return email.

To Order by Mail

Make your check payable to Chaco Canyon Consulting, for the amount indicated:
  • For the download: USD 199.00
  • For access online for three months: USD 199.00
  • For access online for one month: USD 69.95
And send it to:
Chaco Canyon Consulting
700 Huron Avenue, Suite 19C
Cambridge, MA 02138

To use the course software you’ll need some other applications, which you very probably already have. By placing your order, you’re confirming that you have the software you need, as described on this site.

Spreadsheet Models for Managers

Arrays in Excel 2/5
Session Links
  • An array is a rectangular range of cells or values
  • Analysis and Synthesis best done with array manipulation
  • It’s possible to do this cell-by-cell, but that approach is:
    • Cumbersome
    • Error-prone
    • Hard to follow and maintain
  • Better: use arrays
    • An array formula returns an array that’s spread over the cells in which you enter it
    • One array=>One formula
    • Faster computations
    • Sometimes you must transpose the arrays to get the result you need
  • How to enter an array formula
    • Windows: Ctrl+Shift+Enter
    • Mac: Command+Enter or Ctrl+Shift+Enter

Before we actually look at an example of analysis and synthesis, let’s take a brief excursion into array manipulation. Doing things in this order has some advantages — when we get to the analysis/synthesis example, you’ll have all the tools you need to understand how we worked it. And it has a disadvantage. We’re asking you to learn about array manipulation without really understanding the need for it. That situation makes some people impatient, but if you can possibly hang in there, you’ll be rewarded.

All formulas in cells in Excel “return” values when they compute themselves. The value they return is then displayed as the value of the cell. For example, the formula =A1+B1 “returns” the sum of A1 and B1. Array formulas are a little different. They return an array of values, and distribute that array across the range of cells that hold the array formula.

Last Modified: Wednesday, 27-Apr-2016 04:15:26 EDT

Matrix Multiplication and Array Arithmetic

For many of you, matrix multiplication and array arithmetic are new ideas. It’s easy to get lost in the details of how they work and then forget about why we use them.

To keep a clear view of the forest and avoid focusing only on the trees, remember why we use matrix multiplication and array arithmetic. Briefly, we use them because we find that it’s very often helpful to decompose a problem into parts (analysis), then do calculations on the parts, and finally reassemble the final solution from the results of those partial calculations (synthesis).

Matrix multiplication and array arithmetic provide us with very convenient methods for performing those intermediate calculations on the parts. They’re the tools that make analysis and synthesis so powerful.