Depth; Deriv; Dervx; Desolve - HP 48gII Advanced User's Reference Manual

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See also:
INDEP

DEPTH

Type:
RPL Command
Description: Depth Command: Returns a real number representing the number of objects present on the
stack (before DEPTH was executed).
Access:
I
STACK
Input/Output:
See also:
CLEAR, DROPN

DERIV

CAS:
Return the partial derivatives of a function, with respect to specified variables.

DERVX

CAS:
Return the derivative of a function with respect to the current variable.

DESOLVE

CAS:
Solve first-order ordinary differential equations with respect to the current variable.

DET

Type:
Command
Description: Determinant Function: Returns the determinant of a square matrix.
The argument matrix must be square. DET computes the determinant of 1 × 1 and 2 × 2
matrices directly from the defining expression for the determinant. DET computes the
determinant of a larger matrix by computing the Crout LU decomposition of the matrix and
accumulating the product of the decomposition ' s diagonal elements.
Since floating-point division is used to do this, the computed determinant of an integer matrix is
often not an integer, even though the actual determinant of an integer matrix must be an integer.
DET corrects this by rounding the computed determinant to an integer value. This technique is
also used for noninteger matrices with determinants having fewer than 15 nonzero digits: the
computed determinant is rounded at the appropriate digit position to restore some or all of the
accuracy lost to floating-point arithmetic.
This refining technique can cause the computed determinant to exhibit discontinuity. To avoid
this, you can disable the refinement by setting flag –54.
Access:
Flags:
Tiny Element (–54)
Input/Output:
See also:
CNRM, CROSS, DOT, RNRM

DETACH

Type:
Command
Description: Detach Library Command: Detaches the library with the specified number from the current
directory. Each library has a unique number. If a port number is specified, it is ignored.
3-44 Full Command and Function Reference
L
STACK
DEPTH
L
DEPTH
Level n...Level 1
OPERATIONS DET
NORMALIZE DET
Level 1/Argument 1
[[ matrix ]]
( °is the left-shift of the Nkey).
( Ø is the left-shift of the 5key).
( ´ is the left-shift of the Pkey).
Level 1
n
Level 1/Item 1
x
determinant

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