VISI(1) VISI(1)
NAME
visi - mathematical spreadsheet
SYNOPSIS
visi [ file ]
DESCRIPTION
Visi is a tabular mathematical worksheet for data analysis.
If a file is specified, commands are read from that file
when visi first starts.
Visi works only on cursor-controlled terminals such as the
HP2621, and requires the environment variable TERM (see
environ(7)) to be set appropriately.
Visi prompts for input at the top of the screen with `>>'.
Input has one of the forms,
command parameters
variable = expression
variable = "string"
where a variable is a letter and number sequence, for exam-
ple: `A2, B10, BB23.' These variables represent locations
on the worksheet; A2 is column A, row 2. If you type, in
any order,
A1 = A2 + 5
A2 = 10
the values 15 and 10 will appear on the screen. If you
later type
A2 = 20
the values will be updated to 25 and 20. Visi treats upper
and lower case letters as identical.
Expressions are parsed, and standard mathematical precedence
is retained. The operators +, -, *, /, ** (or ^) can be
used in expressions.
Commands
copy [ file ]
Copy the screen image to the file. If a file is
not specified, visi will prompt for one.
debug Toggle a flag to give yacc(1) debugging output,
VISI(1) VISI(1)
very unreadable.
duplicate p1 thru p2 at p3
Duplicate a block of definitions in another por-
tion of the screen. P1 and p2 are the upper left
corner and the lower right corner of the block to
be duplicated. P3 is the upper left corner of the
destination.
edit Edit the commands list. If the environment vari-
able `ED' is set, it is used as the name of the
editor. Otherwise, ed(1). is called.
help Display a brief synopsis of the commands.
list List the current definitions on the terminal.
quit Quit the program.
read [ file ]
Read input lines from the file. If a file is not
specified, visi will prompt for one.
redraw Redraw the screen in the event the terminal output
was corrupted.
replicate p1 at p2 thru p3
Replicate the single definition at p1 throughout
the block from p2 in the upper left corner thru p3
in the lower right.
scale [ column ] nnn
Change the scale of the specified column, or of
the entire tableau if a column is not specified.
The scale nnn is the number of decimal places that
are displayed to the right of the decimal point.
Calculations are done in double precision regard-
less of scale.
shift direction [ nnn ]
Shift the current screen in any direction. The
screen is only a window on the tableau. To see
other portions of the tableau, the screen must be
shifted. Valid directions are: up, down, left,
right. Nnn is the number of positions to shift
the screen (default 1).
shell Invoke /bin/sh as an inferior process to visi.
ver Print the current version number of visi.
width column nnn
VISI(1) VISI(1)
Change the width of a column on the display, or of
the entire tableau if no column is specified.
write [ file ]
Write commands to a file. If a file is not speci-
fied, visi will prompt for one.
Built-in Functions
abs(e) Absolute value of e.
acos(e) Arc cosine of e.
asin(e) Arc sine of e.
atan(e) Arc tangent of e.
atan2(e1,e2) Arc tangent of e1/e2.
cos(e) Cosine of e.
exp(e) Exponential function of e.
gamma(e) Log of the gamma function of e.
hypot(e1,e2) Square root of the sum of the squares of e1
and e2.
int(e) The integer part of e (truncated toward zero.)
log(e) Natural log of e.
pi The constant 3.14159265358979....
pow(e1,e2) Same as e1^e2.
sin(e) Sine of e.
sqrt(e) Square root of e.
Other Special Definitions
position[e1,e2]
The quantity at row e1, column e2 of the tableau.
Numbering for the columns is A = 1, B = 2, ..., AA
= 27, and so on.
ROW The row number of this entry.
COL The column number of this entry.
SEE ALSO
ed(1), exp(3), sin(3)
FILES
/usr/lib/visi.help
BUGS
A circular list of variable declarations can cause visi to
hang in a loop.
Scale does truncation, not rounding.