home *** CD-ROM | disk | FTP | other *** search
- The CDFwalk program allows direct access to related variable data values.
- The data values of up to 27 variables may be displayed at once (the CDF can
- have more variables but only 27 may be viewed at any one time). The data
- value for each variable at a given record/index location within the CDF
- conceptual view is displayed. The user can "walk" from one record/index
- location to another sequentially (in any "direction") or a particular
- record/index location can be "jumped" to directly. Variable values may
- also be used to directly "jump" to a record/index location.
-
- The user interface to CDFwalk is contained on a single screen which is
- divided into several fixed windows and pop-up windows. The Action Menu
- controls the execution of the program. This menu allows you to "walk"
- through a CDF, select a new CDF through which to "walk", browse online
- help, or exit the program. This menu may be displayed at any time by
- entering Ctrl-F. Use the up and down arrow keys to highlight a choice in
- the Action Menu and then enter a carriage return to execute that function.
- Two very important windows are the Keypad Definition and Message windows.
- They contain information on keypad functionality and program status/error
- messages.
-
- When CDFwalk is executed (and a CDF and/or directory is not entered on the
- command line), you must first specify the CDF through which you wish to
- "walk". If you enter a full disk/directory specification (without a CDF
- name), all of the CDFs in the specified directory will appear in a separate
- pop-up window. Use the up and down arrow keys to choose a CDF and then
- enter a carriage return to "walk" through that CDF.
-
- After the input CDF is selected, the Record/index window appears. The size
- of this window depends on the dimensionality of the input CDF. Vertically
- the window will contain one row for the record number and one row for each
- dimension of the CDF. Horizontally, each line of the window contains three
- fields. The first field contains a variable name, the second field
- contains a data value for the variable, and the third field contains a
- record number or dimension index.
-
- The variable selected for the record number line will be one that only
- varies from record to record (not varying along any of the dimensions). If
- more than one variable of that type exists in the CDF, a pop-up window will
- be displayed containing the list of variables. Select one of the variables
- keeping in mind that you will have an opportunity to use it for positioning
- by value to a desired record.
-
- The variable selected for each dimension line will be one that only varies
- along the corresponding dimension (and does not vary from record to
- record). Again, if more than one variable of that type exists in the CDF,
- a pop-up window will be displayed to allow you to select the variable to
- use for that dimension. Keep in mind that you will be able to use it to
- position by value to a desired index along that dimension.
-
- After the Record/index window has been specified (which may occur
- automatically), the Variable Values window will be displayed. It contains
- up to 27 variable names and the associated data values for the record/index
- shown in the Record/index window.
-
- Initially the cursor will be positioned at the data value field of the
- record number line in the Record/index window. You may now begin to "walk"
- through the CDF by using the right arrow to increment and the left arrow to
- decrement the record number. Each time a new record number is specified,
- the data for each variable is updated in both the Record/index and Variable
- Values windows. If the CDF contains many records, you may want to quickly
- advance to a desired record. You may do this by entering the i key (the
- cursor must be on the data value field). CDFwalk enters an input mode and
- prompts for the value to which you wish to advance. If the exact value is
- not in the CDF for the variable, the record number is changed to correspond
- to the closest possible value. Another method of advancing to a desired
- value is by entering Ctrl-P. This will cause a pop-up window containing
- all of the values for the variable to be displayed. You may select the
- value desired as you would with any other pop-up window, and CDFwalk will
- automatically position the record number to the corresponding value.
-
- After positioning to a desired record (and the CDF is multi-dimensional)
- you may now wish to "walk" through the dimension index. This is done by
- entering the up and down arrow keys to position the cursor to the desired
- dimension line. "Walking" through dimensions is done in the same way as
- "walking" through the record numbers.
-
- You may also wish to "walk" through the CDF by using the actual record
- number or dimension index rather than data values. This is done by
- entering a carriage return which causes the cursor to advance to the next
- field (i.e., from the data value field to the record number/index field).
- Entering Ctrl-H causes the cursor to move back to the previous field.
- "Walking" through the CDF using the record number/index fields is the same
- as using the data value fields but with a few exceptions. First, no Ctrl-P
- option is available with these fields. Also, when in input mode, you may
- input either an absolute record number/index to which to move or you may
- enter a relative offset for the record number/index. Prefixing the value
- with a +/- will increment/decrement the record number/index by that amount.
-
- If the CDF contains more than 27 variables and a particular variable is not
- currently displayed in the Variable Values window, an option is provied to
- scroll new variables into that window. This is done by entering a v key.
- A small pop-up window is displayed in which you may use the up and down
- arrow keys to scroll in or scroll out variables. If the CDF contains a
- very large number of variables, entering a u or d key will display a new
- set of 27 variables (moving up or down through the variables in the CDF).
- When the desired set of variables is displayed, enter a carriage return to
- continue "walking" through the CDF.
-
- When you are finished "walking" through the CDF, enter Ctrl-F to display
- the Action Menu. You may input a new CDF, resume "walking" through the
- current CDF, read online help, or exit the program.
-