calc: Truncating the Stack
7.7.8 Truncating the Stack
--------------------------
The ‘d t’ (‘calc-truncate-stack’) command moves the ‘.’ line that marks
the top-of-stack up or down in the Calculator buffer. The number right
above that line is considered to the be at the top of the stack. Any
numbers below that line are “hidden” from all stack operations (although
still visible to the user). This is similar to the Emacs “narrowing”
feature, except that the values below the ‘.’ are _visible_, just
temporarily frozen. This feature allows you to keep several independent
calculations running at once in different parts of the stack, or to
apply a certain command to an element buried deep in the stack.
Pressing ‘d t’ by itself moves the ‘.’ to the line the cursor is on.
Thus, this line and all those below it become hidden. To un-hide these
lines, move down to the end of the buffer and press ‘d t’. With a
positive numeric prefix argument ‘n’, ‘d t’ hides the bottom ‘n’ values
in the buffer. With a negative argument, it hides all but the top ‘n’
values. With an argument of zero, it hides zero values, i.e., moves the
‘.’ all the way down to the bottom.
The ‘d [’ (‘calc-truncate-up’) and ‘d ]’ (‘calc-truncate-down’)
commands move the ‘.’ up or down one line at a time (or several lines
with a prefix argument).
Info Catalog
calc: Date Formats
calc: Display Modes
calc: Justification