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...

 
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...

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...

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). 
_...

 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}...

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 
´...

 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...

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...

 
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,...

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...