HP 15c Manual

							 Appendix F: Batteries 261 
 
Verifying Proper Operation (Self-Tests) 
If it appears that the calculator will not turn on or otherwise is not operating 
properly, use the following procedures to access the test system; 
1) Turn the calculator off. 
2) Press and HOLD the | and v keys (keep both keys held 
down for the next step). 
3) Press the = key (while both | and v keys are held down 
from Step 2 above). 
4) Release the = key. 
5) Release the | and v keys. 
You will be presented with a main test screen that displays the following: 
1.L  2.C  3.H 
 Press 1 to perform the LCD test (all LCD segments will be turned on). 
Press any key to exit 
 Press 2 to perform the checksum test and see the copyright messages. 
Press any key to go from one screen to the next until you return to the 
main test screen. 
 Press 3 to perform the keyboard test. You then need to press EVERY 
key on the keyboard until all the keys have been pressed at least once 
(the screen will progressively turn off).  You can press the keys in any 
order and any number of times. Once all the keys have been pressed 
and the screen is clear, press on any key to return to the test screen. 
Press = to exit the test system. This will also turn the calculator off.  
If  the  calculator  detects  an  error  at  any  point,  it  will  display  an  error 
message. 
If  you  still  experience  difficulty,  write  or  telephone  Hewlett-Packard  at  an 
address or phone number listed on the web at: www.hp.com/support.  
						

							 
262 
Function Summary and Index
= Turns the 
calculators display on 
and off (page 18). It is 
also used in resetting 
Continuous Memory 
(page 63), changing the 
digit separator (page 
61), and in various tests 
of the calculators 
operation (pages 261). 
Complex 
Functions 
} Real exchange 
imaginary. Activates 
Complex mode 
(establishing an 
imaginary stack) and 
exchanges the real and 
imaginary X-registers 
(page 124). 
V Used to enter 
complex numbers. 
Activates Complex 
mode (establishing an 
imaginary stack) 
(page 121). Also used 
with m to indirectly  
dimension matrices 
(page 174). (For Index 
register functions, refer 
to Index Register 
Control keys, 
page 263.)% Displays 
the contents of the 
imaginary X-register 
while the key is held 
(page 124). 
F 8   Sets flag 8, 
which activates 
Complex mode 
(page 121). 
 8   Clears flag 8, 
deactivating Complex 
mode (page 121). 
Conversions 
; Converts polar 
magnitude r and angle  
θ in X- and Y-registers 
respectively to 
rectangular x- and y-
coordinates (page 31). 
For operation in 
Complex mode, refer to 
page 134. 
: Converts x, y 
rectangular coordinates 
placed in X- and Y-
registers respectively to 
polar magnitude r and 
angle θ (page 30). For 
operation in Complex 
mode, refer to page 134. 
h Converts 
decimal hours (or 
degrees) to hours, 
minutes, seconds (or 
degrees, minutes, 
seconds) (page 27). 
À Converts hours, 
minutes, seconds (or 
degrees, minutes, 
seconds) to decimal 
hours (or degrees) (page 
27). 
r Converts 
degrees to radians  
(page 27). 
d Converts 
radians to degrees (page 
27). 
Digit Entry 
v Enters a copy 
of number in X-register 
(display) into Y-register; 
used to separate multiple 
number entries (pages 
22, 37). 
“ Change sign of 
number or exponent of 
10 in display (pages 19, 
124). 
  
						

							263 Function Summary and Index 
 
 
‛ Enter exponent; 
next digits keyed in are 
exponents of 10  
(page 19). 
0 through 9 digit 
keys (page 22). 
. Decimal point  
(page 22) 
Display Control 
• Selects fixed 
point display mode 
(page 58). 
i Selects scientific 
notation display mode 
(page 59). 
^ Selects 
engineering notation 
display mode (page 
59). 
Mantissa. Pressing 
´ CLEAR u 
displays all 10 digits of 
the number in the X-
register as long as the 
u key is held 
down (page 60). It also 
clears any partial key 
sequences  
(page 19). 
Hyperbolic 
Functions 
P[ 
P\ 
P] Compute 
hyperbolic sine, 
hyperbolic cosine, or 
hyperbolic tangent, 
respectively (page 28). 
H [, H 
\, H ] 
Compute inverse 
hyperbolic sine, inverse 
hyperbolic cosine, or 
inverse hyperbolic 
tangent, respectively 
(page 28). 
Index Register 
Control 
V Index register (RI). 
Storage register for: 
indirect program 
execution – branching 
with t and G, 
looping with I and 
s – indirect flag 
control, and indirect 
display format control 
(page 107). Also used 
to enter complex 
numbers and activate 
Complex mode (page 
121). 
% Indirect 
operations. Used to 
address another storage 
register through RI for 
purposes of storage, 
recall, storage, 
arithmetic, and program 
loop control (page 
107). Also used with 
m to allocate 
storage registers (page 
215). 
Logarithmic and 
Exponential 
Functions 
N Computes natural 
logarithm (page 28). 
 Natural 
antilogarithm. Raises e 
to power of number in 
display (X-register) 
(page 28). 
o Computes 
common logarithm 
(base 10) (page 28). 
@ Common 
antilogarithm. Raises 
10 to power of number 
in display (X-register) 
(page 28). 
Y Raises number in 
Y-register to power of  
						

							264 Function Summary and Index 
 
number in display (X-
register) (enter y, then 
x). Causes the stack to 
drop (page 29). 
Mathematics 
-+-÷ 
Arithmetic operators; 
cause the stack to drop 
(page 29). 
¤ Computes square 
root x (page 25). 
x Computes 
the square of x 
(page 25). 
! Calculates the 
factorial (n!) of x or 
Gamma function (Γ) of 
(1 + x) (page 25). 
∕ Computes 
reciprocal (page 25). 
(For matrix use, refer to 
Matrix Functions, page 
264.) 
$ Places value of π 
in display (page 24). 
_ Solves for real 
root of a function f(x), 
with the expression for 
f(x) defined by the user 
in a labeled subroutine 
(page 180). 
f Integrate. 
Computes the definite 
integral of f(x), with the 
expression f(x) defined 
by the user in a labeled 
subroutine (page 194). 
Matrix Functions 
m Dimensions a 
matrix of a given name 
{A to E, V} 
(page 141). 
< Designates the 
matrix into which the 
result of certain matrix 
operations is placed 
(page 148). 
U User mode. Row 
and column numbers in 
R0 and R1 are 
automatically 
incremented each time 
O or l {A 
to E, %} is pressed 
(page 144). 
O and l { A 
to E, %} Stores or 
recalls matrix elements 
using the row and 
column numbers in R0 
and R1 (pages 144, 
146). 
O | and l 
| {A to E, % 
} Stores or recalls 
matrix elements using 
the row and column 
numbers in the Y- and 
X-registers (page 146). 
O and 
l> { A 
to E } Stores or 
recalls matrices for the 
specified matrix (pages 
142, 147). 
O and l 
< Stores or 
recalls descriptor of the 
result matrix (page 
148). 
l m {A 
through E, V} 
Recalls the dimensions 
of the given matrix into 
the Y- (row) and X- 
(column) registers 
(page 142). 
∕ Inverts the matrix 
whose descriptor is 
displayed and places 
the result in the 
specified result matrix. 
The descriptor of the 
result matrix is then 
displayed (page 150). 
+ - * Adds, 
subtracts, or multiplies 
the corresponding 
elements of two  
						

							 Function Summary and Index 265 
 
matrices or of one 
matrix and a scalar. 
Stores in result matrix 
(page 152-155). 
÷ For two matrices, 
multiplies inverse of 
matrix in X by matrix 
in Y. For only one 
matrix, if matrix in Y, 
divides all elements of 
matrix by scalar in X; if 
matrix in X, multiplies 
each element of inverse 
of matrix by the scalar 
in Y. Stores in result  
matrix (pages 152-
155). 
“ changes sign of 
all elements in matrix 
specified in X-register 
(page 150). 
> {0 through 9} 
Matrix operations. 
> 0 Dimensions 
all matrices to 0×0 
(page 143). 
> 1 Sets row and 
column numbers in R0 
and R1 to 1 (page 143). 
> 2 Complex 
transform: ZP to    
(page 164). 
> 3 inverse 
complex transform.    
to ZP (page164). 
> 4 Transpose X 
to XT (page 150). 
> 5 Transpose 
multiply: Y and X to 
YTX (page 154). 
> 6 Calculates 
residuals in result 
matrix (page 159). 
> 7 Calculates 
row norm of matrix 
specified in X-register 
(page 150). 
> 8 Calculates 
Frobenius norm of 
matrix specified in X-
register (page 150). 
> 9 Calculates 
determinant of matrix 
specified in X-register 
(also does LU 
decomposition of the 
matrix) (page 150). 
c Transforms 
matrix stored in 
partitioned form (Z P) 
to complex form (ZC) 
(page 162). 
p Transforms 
matrix stored in 
complex form (Z C) to 
partitioned form (Z P) 
(page 162). 
~ T 0 T 5  
T 6 Conditional 
tests for matrix 
descriptors in the X- or 
X- and Y-registers. 
~ and T 0 (x ≠ 
0) test the quantity in 
the X-register for zero. 
Matrix descriptors are 
considered nonzero.  
T 5 (x = y) and 
T  
6 (x ≠ y) test if the 
descriptors in X and Y 
are the same. The result 
affects program 
execution: skip (one 
line) if false (page 
174). 
Number Alteration 
a Yields absolute 
value of number in 
display (page 24). 
q Leaves only 
fractional portion of 
number in display  
(X-register) by 
truncating integer 
portion (page 24). 
‘ Leaves only 
integer portion of 
number in display (X- 
						

							266 Function Summary and Index 
 
register) by truncating 
fractional portion (page 
24). 
& Rounds mantissa 
of entire (10-digit) 
number in X-register to 
match display format 
(page 24). 
Percentage 
k Percent. Computes 
x% (value in display) of 
number in the Y-
register (page 29). 
Unlike most two-
number functions, k 
does not drop the stack. 
∆ Percent difference. 
Computes percent of 
change between number 
in Y-register and 
number in display 
(page 30). Does not 
drop the stack. 
Prefix Keys 
´ Pressed before a 
function key to select 
the gold function 
printed above that key 
(page 18). 
| Pressed before a 
function key to select 
the blue function 
printed below that key 
(page 18). 
For other prefix keys, 
refer to Display Control 
keys (page 263), 
Storage keys (page 
267), and the 
Programming Summary 
and Index (page 269). 
CLEAR u 
Cancels any prefix 
keystrokes and partially 
entered instructions 
such as ´  i 
(page 19). Also 
displays the complete 
10-digit mantissa of the 
number in the display 
(page 60). 
Probability 
c Combination. 
Computes the number 
of possible sets of y 
different items taken x 
at a time, and causes the 
stack to drop (page 47). 
(For matrix use, refer to 
Matrix Functions keys, 
page 264.) 
p Permutation. 
Computes the number 
of possible different 
arrangements of y 
different items taken x 
at a time, and causes the 
stack to drop (page 47). 
(For matrix use, refer to 
Matrix Functions keys, 
page 264.) 
Stack 
Manipulation 
® Exchanges 
contents of X- and Y-
stack registers (page 
34). 
X X-register 
exchange. Exchanges 
contents of X-register 
with those of any other 
named storage register. 
Used with V , %, 
digit, or . digit 
address (page 42). 
} Real exchange 
imaginary. Exchanges 
the contents of the real 
and imaginary X-
registers and activates 
Complex mode (page 
124). 
) Rolls down 
contents of stack (page 
34). 
( Rolls up contents 
of stack (page 34).  
						

							 Function Summary and Index 267 
 
` Clears contents 
of display (X-register) 
to zero (page 21). 
− In Run mode: 
removes the last digit 
keyed in, or clears the 
display (if digit entry 
has been terminated) 
(page21). 
Statistics 
z Accumulates 
numbers from X- and 
Y-registers into storage 
registers R2 through R7 
(page 49). 
w Removes numbers 
in X- and Y-registers 
from storage registers 
R2 through R7 for 
correcting z 
accumulations (page 
52). 
’ Computes mean of 
x- and y-values 
accumulated by z 
(page 53). 
S Computes sample 
standard deviations of 
x- and y-values 
accumulated by z 
(page 53). 
j Linear estimate 
and correlation 
coefficient. Computes 
estimated value of y (ŷ) 
for a given value of x 
by least squares method 
and places result in X-
register. Computes the 
correlation coefficient, 
r, of the accumulated 
data and places result in 
Y-register (page 55). 
L Linear Regression. 
Computes the y-
intercept and slope for 
the linear function best 
approximating the 
accumulated data. The 
value of the y-intercept 
is placed in the X-
register; the value of the 
slope is placed in the Y-
register (page 54). 
# Random 
number. Yields a 
pseudorandom number 
as generated from a 
seed stored using O 
# (page 48). 
CLEAR ∑ Clears 
contents of the statistics 
registers (R2 to R7) 
(page 49). 
Storage 
O Store. Stores a 
copy of a number into 
the storage register 
specified {0 to 9, .0 to 
.9, V, %} (page 
42). Also used for 
storage register 
arithmetic: new register 
contents = old register 
contents { +, -, 
*,  ÷ } display 
(page 44). 
l Recall. Recalls a 
copy of the number 
from the storage 
register specified {0 to 
9, .0 to .9, V, % } 
(page 42). Also used 
for storage register 
arithmetic: new display 
= old display {+, 
- *, ÷} 
register contents (page 
44). 
CLEAR Q Clears 
contents of all storage 
registers to zero 
(page 43). 
K Recalls into 
the display the number 
present before the 
previous operation 
(page 35).  
						

							268 Function Summary and Index 
 
Trigonometry 
D Sets decimal 
Degrees mode for 
trigonometric 
functions—indicated by 
absence of GRAD or 
RAD annunciator (page 
26). Not operative for 
complex trigonometry. 
R Sets Radians 
mode for trigonometric 
functions—indicated by 
RAD annunciator (page 
26).  
g Sets Grads mode 
for trigonometric 
functions—indicated by 
GRAD annunciator 
(page 26) Not operative 
for complex 
trigonometry.
[, \, ] 
Compute sine, cosine, 
or tangent, respectively, 
of number in display 
(X-register) (page 26). 
, , {, / 
Compute arc sine, arc 
cosine, or arc tangent, 
respectively, of number 
in display (X-register) 
(page 26). 
  
						

							 
269 
Programming Summary and Index
¥ Program/Run 
mode. Sets the 
calculator to Program 
mode (PRGM 
annunciator on) or Run 
mode (PRGM 
annunciator cleared) 
(page 66). 
W Displays current 
status of calculator 
memory (number of 
registers dedicated to 
data storage, the 
common pool, and 
program memory) 
(page 215). 
W Displays current 
status of calculator 
memory (number of 
registers dedicated to 
data storage, the 
common pool, and 
program memory) 
(page 215). 
− Back arrow. In 
Program mode, deletes 
displayed instruction 
from program memory. 
All subsequent 
instructions are moved 
up (page 83). 
b Label. Used with 
the label designations 
below to denote the 
start of a program 
routine (page 67). 
ABCÁE 0 
1 2 3 4 5 6 7 8 9 .0 .1 .2 
.3 .4 .5 .6 .7 .8 .9 Label 
designations. When 
preceded by b, 
define the beginning of 
a program routine 
(page 67). Also used 
(without b) to 
initiate execution of a 
specific routine 
(page 69). 
U Activates and 
deactivates User mode, 
which exchanges the 
primary (white) and 
gold alternate functions 
(A through E) of 
the top left five 
functions (page 69). 
User mode also affects 
the matrix use of O 
or l {A 
throughE , %} 
User mode 
automatically 
increments R0 (row 
number) or R1 (column 
number) for storage or 
recall of matrix 
elements (page 144). 
t Go to. Used with 
a label designator 
(listed above) or V to 
transfer the position of 
the calculator to the 
designated label. If it is 
a program instruction, 
program execution 
continues. If it is not a 
program instruction, 
only the position 
change occurs (page 
90). If a negative 
number is stored in RI, 
t V will effect a 
transfer to a line 
number (page 109). 
t “ nnn Go to 
line number. Positions 
calculator to the 
existing line number 
specified by nnn. Not 
programmable (page 
82). 
G Go to subroutine. 
Used with a label 
designator (listed 
above) or start the 
execution of a given, 
labeled routine. Can be 
used both in a program 
and from the keyboard 
(in Run mode). A 
n instruction 
transfers execution back 
to the first line  
						

							270 Programming Summary and Index 
 
following the G 
(page 101). 
‚ Back step. 
Moves calculator back 
one or more lines in 
program memory. (Also 
scrolls in Program 
mode.) Displays line 
number and contents of 
previous program line 
(page 83). 
 Single step. In 
Program mode: moves 
calculator forward one 
or more lines in 
program memory. In 
Run mode: displays and 
executes the current 
program line, then steps 
to next line to be 
executed (page 82). 
© Pause. Halts 
program execution for 
about 1 second to 
display contents of X-
register, then resumes 
execution (page 68). 
¦ Run/Stop. 
Begins program 
execution from current 
line number in program 
memory. Stops 
execution if program is 
running (page 68). 
n Return. Causes 
calculator to return to 
line 000 and halt 
execution (if running) 
(page 68). If in a 
subroutine, merely 
returns to line after  
G (page 101). 
F Set flag (= true). 
Sets designated flag (0 
to 9). Flags 0 through 7 
are user flags, flag 8 
signifies Complex 
mode, and flag 9 
signifies an overflow 
condition (page 92). 
 Clear flag (= 
false). Clears 
designated flag (0 to 9) 
(page 92). 
? Is flag set? Tests 
for designated flag. If 
set, program execution 
continues; If cleared, 
program execution 
skips one line before 
continuing (page 92). 
£ ~ T {0 
through 9} Conditional 
tests. Each test 
compares value in X-
register against 0 or 
value in Y-register as 
indicated. If true, 
calculator executes 
instruction in next line 
of program memory. If 
false, calculator skips 
one line in program 
memory before 
resuming execution 
(page 91). ~ and 
T 0, 5, and 6 are 
also valid for complex 
numbers and matrix 
descriptors (pages 132. 
174). 
T 0 x ≠ 0 
T 1 x > 0 
T 2 x < 0 
T 3 x ≥ 0 
T 4 x ≤ 0 
T 5 x = y 
T 6 x ≠ y 
T 7 x > y 
T 8 x < y 
T 9 x ≥ y 
s Decrement and 
skip if equal to or less 
than. Decrements 
counter value in given 
register as stipulated. 
Skips one program line 
if new counter value is 
equal to or less than 
specified test value 
(page 109). 
I Increment and 
skip if greater than. 
Increments counter 
value in given register 
as stipulated. Skips one 
program line if new 
counter value is greater 
than specified test value 
(page 109).