User Manual

ManualsBrandsSharp Manualscomputerel 520wg

Modify Function

Calculation results are internally obtained in scientific notation

with up to 14 digits for the mantissa. However, since calculation

results are displayed in the form designated by the display nota-

tion and the number of decimal places indicated, the internal

calculation result may differ from that shown in the display. By

using the modify function, the internal value is converted to match

that of the display, so that the displayed value can be used

without change in subsequent operations.

STATISTICAL CALCULATIONS

Press m1 to select the statistics mode. The seven statisti-

cal calculations listed below can be performed. After selecting the

statistics mode, select the desired sub-mode by pressing the

number key corresponding to your choice.

To change statistical sub-mode, reselect statistics mode (press

m1), then select the required sub-mode.

0 (SD) : Single-variable statistics

1 (LINE) : Linear regression calculation

2 (QUAD) : Quadratic regression calculation

3 (EXP) : Exponential regression calculation

4 (LOG) : Logarithmic regression calculation

5 (PWR) : Power regression calculation

6 (INV) : Inverse regression calculation

The following statistics can be obtained for each statistical calcu-

lation (refer to the table below):

Single-variable statistical calculation

Statistics of Q and value of the normal probability function

Linear regression calculation

Statistics of Q and W and, in addition, estimate of y for a given

x (estimate y´) and estimate of x for a given y (estimate x´)

Exponential regression, Logarithmic regression,

Power regression, and Inverse regression calculation

Statistics of Q and W. In addition, estimate of y for a given x

and estimate of x for a given y. (Since the calculator converts

each formula into a linear regression formula before actual

calculation takes place, it obtains all statistics, except coeffi-

cients a and b, from converted data rather than entered data.)

Quadratic regression calculation

Statistics of Q and W and coefficients a, b, c in the quadratic

regression formula (y = a + bx + cx

). (For quadratic regression

calculations, no correlation coefficient (r) can be obtained.)

When there are two x´ values, press @≠.

When performing calculations using a, b and c, only one numeric

value can be held.

x Mean of samples (x data)

sx Sample standard deviation (x data)

x Population standard deviation (x data)

n Number of samples

x Sum of samples (x data)

Sum of squares of samples (x data)

y Mean of samples (y data)

sy Sample standard deviation (y data)

y Population standard deviation (y data)

y Sum of samples (y data)

Sum of squares of samples (y data)

xy Sum of products of samples (x, y)

r Correlation coefficient

a Coefficient of regression equation

b Coefficient of regression equation

c Coefficient of quadratic regression equation

• Use K and R to perform a STAT variable calculation.

Data Entry and Correction

Entered data are kept in memory until @c or mode selec-

tion. Before entering new data, clear the memory contents.

[Data Entry]

Single-variable data

Data

frequency

(To enter multiples of the same

data)

Two-variable data

Data

x &

Data

y k

Data

x &

Data

y &

frequency

k (To enter multiples

of the same data x and y.)

• Up to 100 data items can be entered. With the single-variable

data, a data item without frequency assignment is counted as

one data item, while an item assigned with frequency is stored

as a set of two data items. With the two-variable data, a set of

data items without frequency assignment is counted as two

data items, while a set of items assigned with frequency is

stored as a set of three data items.

[Data Correction]

Correction prior to pressing k immediately after a data entry:

Delete incorrect data with ª, then enter the correct data.

Correction after pressing k:

Use [] to display the data previously entered.

Press ] to display data items in ascending (oldest first)

order. To reverse the display order to descending (latest first),

press the [ key.

Each item is displayed with ‘Xn=’, ‘Yn=’, or ‘Nn=’ (n is the sequen-

tial number of the data set).

Display the data item to modify, input the correct value, then

press k. Using &, you can correct the values of the data

set all at once.

• To delete a data set, display an item of the data set to delete,

then press @J. The data set will be deleted.

• To add a new data set, press ª and input the values, then

press k.

Statistical Calculation Formulas

In the statistical calculation formulas, an error will occur when:

• The absolute value of the intermediate result or calculation result

is equal to or greater than 1 × 10

100

• The denominator is zero.

• An attempt is made to take the square root of a negative number.

• No solution exists in the quadratic regression calculation.

Normal Probability Calculations

•P(t), Q(t), and R(t) will always take positive values, even when

t<0, because these functions follow the same principle used

when solving for an area.

Values for P(t), Q(t), and R(t) are given to six decimal places.

COMPLEX NUMBER CALCULATIONS

To carry out addition, subtraction, multiplication, and division using

complex numbers, press m2 to select the complex number

mode.

Results of complex number calculations are expressed in two modes:

Q @} : Rectangular coordinate mode (xy appears.)

W @{: Polar coordinate mode (

appears.)

Complex number entry

Q Rectangular coordinates

x-coordinate

y-coordinate

x-coordinate

+Ü

y-coordinate

W Polar coordinates

r: absolute value θ: argument

• On selecting another mode, the imaginary part of any complex

number stored in the independent memory (M) will be cleared.

•A complex number expressed in rectangular coordinates with the

y-value equal to zero, or expressed in polar coordinates with the

angle equal to zero, is treated as a real number.

• Press @∑0 to return the complex conjugate of the

specified complex number.

ERROR AND CALCULATION RANGES

Errors

An error will occur if an operation exceeds the calculation ranges,

or if a mathematically illegal operation is attempted. When an error

occurs, pressing < (or >) automatically moves the cursor

back to the place in the equation where the error occurred. Edit the

equation or press ª to clear the equation.

Error Codes and Error Types

Syntax error (Error 1):

• An attempt was made to perform an invalid operation.

Ex. 2 @{

Calculation error (Error 2):

• The absolute value of an intermediate or final calculation result equals

or exceeds 10

100

• An attempt was made to divide by 0 (or an intermediate calculation

resulted in zero).

• The calculation ranges were exceeded while performing calculations.

Depth error (Error 3):

• The available number of buffers was exceeded. (There are 10 buffers*

for numeric values and 24 buffers for calculation instructions).

*5 buffers in STAT mode and complex number mode.

• Data items exceeded 100 in the statistics mode.

Equation too long (Error 4):

• The equation exceeded its maximum input buffer (142 characters).

An equation must be shorter than 142 characters.

Calculation Ranges

• Within the ranges specified, this calculator is accurate to ±1

of the least significant digit of the mantissa. However, a

calculation error increases in continuous calculations due

to accumulation of each calculation error. (This is the same

for y

, etc., where continuous calculations are

performed internally.)

Additionally, a calculation error will accumulate and become

larger in the vicinity of inflection points and singular points

of functions.

• Calculation ranges

±10

–99

~ ±9.999999999×10

and 0.

If the absolute value of an entry or a final or intermediate result of a

calculation is less than 10

–99

, the value is considered to be 0 in

calculations and in the display.

BATTERY REPLACEMENT

Notes on Battery Replacement

Improper handling of batteries can cause electrolyte leakage or

explosion. Be sure to observe the following handling rules:

• Replace both batteries at the same time.

• Do not mix new and old batteries.

• Make sure the new batteries are the correct type.

• When installing, orient each battery properly as indicated in the

calculator.

• Batteries are factory-installed before shipment, and may be ex-

hausted before they reach the service life stated in the specifica-

tions.

Notes on erasure of memory contents

When the battery is replaced, the memory contents are erased.

Erasure can also occur if the calculator is defective or when it is

repaired. Make a note of all important memory contents in case

accidental erasure occurs.

When to Replace the Batteries

If the display has poor contrast or nothing appears on the display

even when ª is pressed in dim lighting, it is time to replace the

batteries.

Cautions

• Fluid from a leaking battery accidentally entering an eye could

result in serious injury. Should this occur, wash with clean water

and immediately consult a doctor.

• Should fluid from a leaking battery come in contact with your skin

or clothes, immediately wash with clean water.

• If the product is not to be used for some time, to avoid damage to

the unit from leaking batteries, remove them and store in a safe

place.

• Do not leave exhausted batteries inside the product.

• Do not fit partially used batteries, and be sure not to mix batteries

of different types.

• Keep batteries out of the reach of children.

• Exhausted batteries left in the calculator may leak and damage

the calculator.

• Explosion risk may be caused by incorrect handling.

• Do not throw batteries into a fire as they may explode.

Replacement Procedure

1. Turn the power off by pressing @ F.

2. Remove the two screws. (Fig. 1)

3. Slide the battery cover slightly and lift it to remove.

4. Remove the used batteries by prying them out with a ball-point

pen or other similar pointed device. (Fig. 2)

5. Install two new batteries. Make sure the “+” side is facing up.

6. Replace the cover and screws.

7. Press the RESET switch (on the back).

• Make sure that the display appears as shown below. If the

display does not appear as shown, remove the batteries, reinstall

them and check the display once again.

(Fig. 1) (Fig. 2)

Automatic Power Off Function

This calculator will turn itself off to save battery power if no key is

pressed for approximately 10 minutes.

Type Regression formula

Linear y = a + bx

Exponential y = a • e

Logarithmic y = a + b • ln x

Power y = a • x

Inverse y = a + b —

Quadratic y = a + bx + cx