Reading Excel Files 

About Clustan
Cluster Analysis
User Support
What's New
White Papers
Contact Us
Blisteringly Fast............
One of the most powerful methods of using ClustanGraphics is via an Excel spreadsheet.  You can prepare and manage your data with Excel until it's in exactly the correct format, including using formulas to calculate your values, and then read it with ClustanGraphics in seconds.

Furthermore, when you have obtained your clustering results, simply copy and paste them back to your spreadsheet for further analysis - for example, in the spreadsheet below simply highlight column 7 and paste the cluster codes obtained from the cluster membership table that ClustanGraphics builds for all clustering procedures.

We need to say a few painful words here about speed.  Several of our data mining users noticed that our Excel reader wasn't the fastest on the planet (apology below!).  Well we've changed all that with release 5.04 (April 2001).  For example, an Excel file of 40,000 cases and 5 variables that used to be excrutiating to read, now gets crunched in 3 seconds flat.  Here's the test file, which fills a whopping 2.5MB of hard disk:

Excel spreadsheet of 4000 rows and 5 columns, with row 1 reserved for variable names and column 1 reserved for case labels.Test for your self - unzip the file, read into Excel, save it, and then input to ClustanGraphics5

Reading this file into ClustanGraphics 5 now takes about 3 seconds on a Pentium III desktop PC.

The Excel Spreadsheet was read in 3 seconds - blisteringly fast!

We'd like to apologize to any user who has stared at our wait cursor in the past - the waiting has now ended, thanks to our new blisteringly fast Excel file cruncher.

What's more, you can optionally prepare your Excel files with a column of case labels, a row of variable names, missing values, mixed data types, and even a column of differential case weights.

Maintained site licenses have been sent the new version.  Non-maintained users might like to consider upgrading to ClustanGraphics 5, and take advantage of all its other new features.