Calculations, K rectangular-polar coordinate conversion – Casio fx-115ES User Manual
Page 39
E-37
k
Σ
Calculations
With
Σ
(, you can obtain the sum of an input
f
(
x
) expression for a
specific range.
Σ
calculations are performed using the following
formula.
Σ
(
f
(
x
),
a
,
b
) =
f
(
a
) +
f
(
a
+ 1) + .... +
f
(
b
)
f
(
x
): Function of X (All non-X variables are treated as
constants.)
a
:
Calculation range start point
b
:
Calculation range end point
•
a
and
b
are integers in the range of –1
×
10
10
<
a
<
b
<
1
×
10
10
.
• The calculation step is fixed at 1.
•
∫
(,
d/dx
(, Pol(, Rec(, and
Σ
( cannot be used within
f
(
x
),
a
, or
b
.
• Pressing A will interrupt an ongoing
Σ
calculation.
Appendix <#035>
Σ
(X + 1, 1, 5) = 20
k Rectangular-Polar Coordinate Conversion
Rectangular
Polar Coordinates
Coordinates (Rec)
(Pol)
• Coordinate conversion can be performed in the COMP, STAT,
MATRIX, and VECTOR calculation modes.
Converting to Polar Coordinates (Pol)
Pol(X, Y)
X: Specifies the rectangular coordinate X value
Y: Specifies the rectangular coordinate Y value
• Calculation result
θ
is displayed in the range of –180
° <
θ
< 180
°.
• Calculation result
θ
is displayed using the calculator’s default angle
unit.
• Calculation result
r
is assigned to variable X, while
θ
is assigned
to Y.
Converting to Rectangular Coordinates (Rec)
Rec(
r
,
θ
)
r
: Specifies
r
value of polar coordinate
θ
: Specifies
θ
value of polar coordinate
• Input value
θ
is treated as an angle value, in accordance with the
calculator’s default angle unit setting.
• Calculation result
x
is assigned to variable X, while
y
is assigned
to Y.