Sharp PC-1403

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What is Manual Calculation ?
The COMPUTER m ay b e b a s i ca l l y used i n t wo ways . O ne wa y lets you s tore i n
advance th e who l e calcula t i on proc ed u re or s te p s i nto the co m p uter' s m em or y as a
progr am , th en le ts t h e c om puter aut o m a t i ca ll y exec u te it l at er . T h e o th e r l ets you
ca l c ul a t e st ep by s t ep t h ro ug h m a nua l k e y o p e r a ti on s . T he l atter is c all ed a m an u a l
ca l cula ti on .
Of co u rse , i n the CA L mod e , a ll c a l c u l at i on s a r e p e rf o rm ed man ua ll y, but he re o n l y
t ho s e pe rf o rme d i n t h e B AS I C mo d e ( RUN o r PR O g ra m mo d e) a re ca ll e d m a n ual
ca l c ul a ti on s.
Manual Calculatio n s in BASIC Mode
E rro r M e s sage
Cau se o f E rror
IM POS SI B L E
• Ma tr ix e s do n o t match in siz e.
C A L CU L A T I O N
M a t r i xes d o n o t m a tc h i n s ize i n add i t ion, s ub t r ac -
t io n , o r m u l tiplica t i on , or an atte m pt was ma de to
ca l c u l a t e the in v e rse m atrix, or to pe rf o r m t h e
s qua r in g, o f a m a t rix w h i c h is n o t a s qua re
mat ri x.
M E M ORY O V ER
• I nsufficie nt m emory
I n X -7 M o pera t io n, me m o ry spa ce is not e no ugh
t o s t o r e m a t r ix M , o r no wo rk a r e a is a va il able fo r
ar i th me ti c o pe rat i on.
DIV I SION BY ZE RO • 0 ( z e ro ) i s used as d i v iso r.
I n an i n vers e m a trix c a l c u lat i o n , an att emp t was
m a d e to d i v i d e a n um be r b y ze r o.
OVER FLO W
• O ve rf l o w h as o c c u rr ed d u r i ng a n arit hmetic oper-
a tio n .
Error Me s sages
I f an error occ u rs during the calcu l atio n o f a m atrix , on e o f th e f o llowi ng me ss ages
appear s o n the d i spla y, together w i t h th e "E " (E rr or ) sign . Pr ess t he ~ k e y to
rel ease th e COMPU T ER from the er ro r co n di t ion an d t he " E " s i gn will go o ff a nd the
me ss a ge " MA T R IX OP E RA T ION " will ap pea r o n t he di s p l ay . At this poi nt , t he matri x
d ata be f o r e the e x e cut i on of t h e m atr ix c al cu l at i o n is r etai n ed i n m e m ory .
U s ing as a Calculator