30.3
45
15
37.9
5
155
26.9
35
15
36.4
5
145
23.7
25
15
34.9
5
135
20.5
15
15
33.2
5
125
33.3
80
10
31.7
5
115
31.0
70
10
30.5
5
105
30.9
60
10
29.1
5
95
26.8
50
10
The access time in Table 3 can be estimated with this model equation:
Tav
=
a
+
bNr
+
cNc
+
dNcNr
where
Nr = number of matrix rows
Nc = number of matrix columns
a = 15.7766 E-3
c = -754.840 E-9
b = 33.9161 E-8
d = 21.2832 E-6
This model equation has a maximum relative error of about 6.7%, but the RMS error is about 1.5%, so
it may be useful to estimate access times for matrices not shown in the table. The graph below shows
the points used to generate the model equation, which are the points from table 3.
Sample points
Number of rows
0
20
40
60
80
10
0
12
0
14
0
16
0
N
u
m
ber
of
col
u
m
n
s
0
20
40
60
80
100
120
140
160
Table 4 shows the mean time to access an element in a few of the matrices from table 3, but using
indirection instead of accessing the elements directly. The indices are local variables. The mean
overhead, compared to direct access, is about 5.7 mS.
7 - 51
Summary of Contents for TI-92+
Page 52: ...Component side of PCB GraphLink I O connector detail 1 41...
Page 53: ...LCD connector detail PCB switch side 1 42...
Page 54: ...Key pad sheet contact side Key pad sheet key side 1 43...
Page 55: ...Key cap detail 1 44...
Page 57: ...Component side of PCB with shield removed A detail view of the intergrated circuits 1 46...
Page 410: ...void extensionroutine2 void Credit to Bhuvanesh Bhatt 10 4...