The Bottom Buttons of TABULA

The bottom buttons of TABULA are intended to be user-customisable. Edit the script: ~user/tabula/bn.ijs.

Spare ones are shown by their labels showing the button number in the form definition, preceded by '='. E.g. "=54", "=55", ...

Currently the bottom buttons are set up as follows:

• "inc" "dec"

increment/decrement the value of the item selected by 1. If param contains a number, that number is used as the increment/decrement instead of 1.

• "%inc" "%dec"

increment/decrement the value of the item selected by 1%. If param contains a number, that number is used as the percentage increment/decrement instead of 1%.

• "zero" "one" "-one"

sets the value of the selected item to zero / one / minus-one respectively. Used mostly to force retrofitting to take place.

• "+" "-" "-~"

create a new item being the sum / difference of the selected items. "-~" reverses the order of the selected items.

• "*" "/" "/~"

create a new item being the product / quotient of the selected items. "/~" reverses the order of the selected items.

• "="

creates a new item equal to the selected item. The main use of this is to display the same quantity in different units.

• "quit"

terminates TABULA and also exits J. Does not exit if the current ttable has unsaved changes, but gives a warning message instead.

• "refr"

refreshes the display of the ttable. Use this to bring back the display after "?", "UUC", "UUF" or "units..." if the action is to be aborted.

• "neg"

negates the value of the selected item.

• "dup"

duplicates the selected item.

• "orph"

orphans the selected item, viz. removes its dependencies on other items, turning it into a non-formula item.

• "unit"

converts the units of the selected item to whatever has been entered as the new units in param, provided the new units are compatible. Otherwise delivers an error message.

• "f(x)"

takes the name of the function typed into param and creates a new item equal to the selected item to which a given function has been applied. Suitable functions are: sqr  cube   sqrt   sin   cos   tan   asin   acos   atan   arcsin   arccos   arctan.

• "*2" "*pi" "*2pi" "*pi/2" "/2" "/2pi"

create a new item being the product/quotient of the selected items with the constant as shown.

• "titl"

takes the contents of param and makes this into the title of the form.

• "info"

displays an information note attached to the ttable and saves with it. The display is able to update the contents of the note.

• "?"

shows a list of cal-engine command strings. This is for development use, since in operation cal would be called exclusively by user interaction with the main form controls.

• "edtt"

shows a J window (.ijs) containing the definition of the currently loaded ttable. This is for development use, since in operation the end-user would have no cause to go editing scripts or ttable definitions directly.

• "etop" "euu" "etab" "ecal" "ebn" "uuc" "uuf"

edits the TABULA scripts in a J window (.ijs). This is for development use, since in operation the end-user would have no cause to go editing scripts directly.

• "1 m" "1 kg" "1 s"

creates new item(s) with the stated value and units.

• "1 c"

creates new item of 1 lightspeed-unit. By changing value and units this can be turned into any velocity item.

• "resta"

restart TABULA (e/g/ after editing a script such as bn, uuc or uuf). (WARNING: existing ttable will be lost if not saved).