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119
• Internal calculations are performed using a 15-digit mantissa, but results are dis-
played using a 10-digit mantissa and 2-digit exponent.
• This unit performs simultaneous linear equations by placing the coefficients in-
side of a matrix. Because of this, as the coefficient matrix approaches zero, pre-
cision in the inverse matrix is reduced and so precision in the results produced
also deteriorates. For example, the solution for a linear equation with three un-
knowns would be calculated as shown below.
xa1b1c1
–1
d1
y = a2 b2 c2 d2
za3b3c3 d3
• An “Ma ERROR” occurs whenever the unit is unable to solve the equations.
• Pressing 1 (REPT) returns to the initial display of the Linear Equation Mode.
Depending on the coefficients that you use, it may take considerable time for
the calculation result of simultaneous linear equations to appear on the dis-
play. Failure of a result to appear immediately does not mean that the unit is
not functioning properly.
kk
kk
k Changing Coefficients
You can change a coefficient either before or after you register it by pressing w.
uu
uu
uTo change a coefficient before registering it with
ww
ww
w
Press the A key to clear the current value and then input another one.
uu
uu
uTo change a coefficient after registering it with
ww
ww
w
Use the cursor keys to highlight the cell that contains the coefficient that you want to
change. Next, input the value that you want to change to.
kk
kk
k Clearing All the Coefficients
While in the Linear Equation Mode, press the 3 (CLR) function key. This operation
clears all the coefficients to zero.
3(CLR)
123456
Linear Equations with Two to Six Unknowns 7 - 2
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