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-
- 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/indices location within
- the CDF conceptual view is displayed. The user can ``walk'' from one
- record/indices location to another sequentially (in any ``direction'') or
- a particular record/indices location can be ``jumped'' to directly. Variable
- values may also be used to directly ``jump'' to a record/indices 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'' throught that CDF.
-
- After the input CDF is
- selected, the Record/Indices 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 varibles.
- 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 varys 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/Indices 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/indices shown in the Record/Indices window.
-
- Initially the
- cursor will be positioned at the data value field of the
- record number line in the Record/Indices 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/Indices
- 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
- the value to which 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 indices. 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 indice
- rather than data values. This is done by entering a carriage
- return which causes the cursor to advance to the next field
- (ie. from the data value field to the record number/indices field).
- Entering Ctrl-H causes the cursor to move back to the
- previous field.
- ``Walking'' through the CDF using the record number/indices 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'' thru the CDF.
-
- When you are done ``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.
-