Pcov; Pdim - HP 48gII Advanced User's Reference Manual

Graphing calculator.

• x
, y
eye
eye
viewed.
• x
and y
step
coordinates plotted.
The plotting parameters are specified in the reserved variable PPAR, which has this form:
For plot type PCONTOUR, the elements of PPAR are used as follows:
• (x
, y
min
• indep is a name specifying the independent variable. The default value of indep is X.
• res is not used.
• axes is not used.
• ptype is a command name specifying the plot type. Executing the command PCONTOUR
places the name PCONTOUR in ptype.
• depend is a name specifying the dependent variable. The default value is Y.
...µ
Access:
Input/Output: None
BAR, CONIC, DIFFEQ, FUNCTION, GRIDMAP, HISTOGRAM, PARAMETRIC,
PARSURFACE, POLAR, SCATTER, SLOPEFIELD, TRUTH, WIREFRAME, YSLICE

PCOV

Type:
Command
Description: Population Covariance Command: Returns the population covariance of the independent and
dependent data columns in the current statistics matrix (reserved variable DAT).
The columns are specified by the first two elements in reserved variable PAR, set by XCOL
and YCOL respectively. If PAR does not exist, PCOV creates it and sets the elements to their
default values (1 and 2).
The population covariance is calculated with the following formula:
x
kn
where
n
2
column
and n is the number of data points.
...µ
Access:
Input/Output:
COL , CORR, COV, PREDX, PREDY, XCOL, YCOL

PDIM

Type:
Command
Description: PICT Dimension Command: Replaces PICT with a blank PICT of the specified dimensions.
If the arguments are complex numbers, PDIM changes the size of PICT and makes the
arguments the new values of (x
scale of a subsequent plot is not changed. If the arguments are binary integers, PPAR remains
unchanged, so the scale of a subsequent plot is changed.
, and z
are real numbers that specify the point in space from which the graph is
eye
are real numbers that set the number of x-coordinates versus the number of y-
step
{ (x
, y
min
min
) and (x
, y
) are not used.
min
max
max
PCONTOUR
is the kth coordinate value in column
1
x
n
,
is the mean of the data in column
1
PCOV
Level 1/Argument 1
min
) (x
) indep res axes ptype depend }
, y
max
max
n
1
-- -
x
x
x
kn
n
kn
n
1
1
2
k
=
1
x
n
kn
1
,
2
n
x
1
n
,
is the mean of the data in column
2
, y
) and (x
, y
) in the reserved variable PPAR. Thus, the
min
max
max
Full Command and Function Reference 3-119
x
n
2
is the kth coordinate value in the
Level 1/Item 1
x
pcovariance
n
2
,  