.NET/ASP.NET/C#/VB.NET PDF Document SDK

In the up class method you use the create_table method to create the entries table, and within the code block you use the column method to create columns of varying types.

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To explore the redundancy effect, Mayer conducted experiments using two multimedia presentations. The rst presentation included the same material both narrated and displayed with text on the screen, and the second presentation included the narration with the text on the screen removed. Audiences who experienced the second presentation retained 28 percent more information and were able to apply 79 percent more creative solutions using the information than those who experienced the rst presentation. Thus, the dual-channels concept turns one of our core assumptions about PowerPoint upside-down. Contrary to conventional wisdom and common practice, reading bullet points from a screen actually hurts learning rather than helps it. Research shows that when you subtract the redundant text from the screen that you are narrating, you improve learning. If you choose not to align your PowerPoint approach with dual channels, you diminish the potential effectiveness of your presentations. When you place both verbal and visual material in the slide area, the busy slide splits the audience s attention between screen and presenter, which creates additional load on working memory. And when you present the same information in both visual and verbal form, you create redundancy that overloads working memory. You can easily resolve the situation in BBP by effectively coordinating visual and verbal information in Notes Page view.

To perform the migration (and therefore actually create the entries table using the migration), you use a Rake task (see the following Rake Tasks sidebar for more information about these) called db:migrate:

Assignments are, perhaps, the most important type of statement in any programming language; it may be difficult to grasp their importance right now Variables may just seem like.

(in /Users/peter/rails/mydiary) == AddEntriesTable: migrating ================================================= -- create_table(:entries) -> 0.3683s == AddEntriesTable: migrated (0.3685s) ========================================

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Each step of the migration is shown in the preceding results. The AddEntriesTable migration is run and the entries table created. No error messages are shown, and the mydiary database now contains an operational entries table.

Rake tasks are administrative tasks associated with your application that are managed by the Rake tool. Rake, meaning Ruby Make, is a tool that you can use to process and trigger actions to perform upon Ruby projects and code, and it s used commonly within Rails projects to do things such as start unit tests and perform migrations. To perform a Rake task, you simply run rake followed by the name of a task:

With two views in PowerPoint, Slide Sorter view and Notes Page view, taken care of, it s time to get back to normal in terms of the way you re used to working in PowerPoint. Click the View tab, and in the Presentation Views group, click Normal to display Normal view, as shown in Figure 2-17. The third trick of BBP is to always work in Normal view last, which you ll do in s 7 and 8. The third research reality will guide you through the reasons why.

4. In case you re wondering yes, it does do something. It calculates the product of 2 and 2. However, the result isn t kept anywhere or shown to the user; it has no side effects, beyond the calculation itself.

You can also get a list of all the Rake tasks available:

With Rails 1.1.6, there are 41 tasks by default. To save space they aren t listed here, but it s worth looking through the list to get a feel for what tasks are available.

The third research reality confronts the PowerPoint assumption that you can create your slides however you want and your audience will understand them. In the pipeline metaphor, a presentation exists by itself, independent of the people who receive