Here's another compute cell. Try evaluating the command factorial(300).

To make new compute cells, hover your mouse just above another compute cell, or just below some output from a compute cell. When you see a skinny blue bar across the width of your worksheet, click and you will open up a new compute cell, ready for input. Note that your worksheet will remember any calculations you make, in the order you make them, no matter where you put the cells, so it is best to stay organized and add new cells at the bottom.

Try placing your cursor just below the monstrous value of $300!$ that you have. Click on the blue bar and try another factorial computation in the new compute cell.

Each compute cell will show output due to only the very last command in the cell. Try to predict the following output before evaluating the cell.

You can combine several commands on one line with a semi-colon. This is a great way to get multiple outputs from a compute cell. The syntax for building a matrix should be somewhat obvious when you see the output, but if not, it is not particularly important to understand now.

Open the word-processor again to create a new bit of text (maybe next to the empty compute cell just below). Type all of the following

A construction called a "list comprehension" is especially powerful, especially since it almost exactly mirrors notation we use to describe sets. Suppose we want to form the plural of the names of the creatures in our zoo. We build a new list, based on all of the elements of our old list.

One final type of list, with numbers this time. The range() function will create lists of integers. In its simplest form an invocation like range(12) will create a list of 12 integers,

There is also a "File" drop-down list, on the left, just above your very top compute cell (not be confused with your browser's File menu item!). You will see a choice here labeled "Save worksheet to a file..." When you do this, you are creating a copy of your worksheet in the "sws" format (short for "Sage WorkSheet"). You can email this file, or post it on a website, for other Sage users and they can use the "Upload"link on their main notebook page to incorporate a copy of your worksheet into their notebook.

There are other ways to share worksheets that you can experiment with, but this gives you one way to share any worksheet with anybody almost anywhere.

We have covered a lot here in this section, so come back later to pick up tidbits you might have missed. There are also many more features in the notebook that we have not covered.