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Section 8. Processing and Math Instructions
8-2
ACOS (Source)
The ACOS function returns the arc cosine of a number.
Syntax
x = ACOS (source)
Remarks
The source can be any valid numeric expression that has a value between -1
and 1 inclusive.
The ACOS function takes the ratio of two sides of a right triangle and returns
the corresponding angle. The ratio is the length of the side adjacent to the angle
divided by the length of the hypotenuse. The result is expressed in radians and
is in the range -π/2 to π/2 radians.
To convert degrees to radians, multiply degrees by π/180. To convert radians
to degrees, multiply radians by 180/π.
ACOS is the inverse trigonometric function of COSINE, which takes an angle
as its argument and returns the length ratio of the side adjacent to the angle to
the hypotenuse.
ACOS Function Example
The example uses ACOS to calculate π. By definition, a full circle is 2π
radians. ACOS(0) is π/2 radians (90 degrees).
Public Pi 'Declare variables.
Pi = 2 * ACOS( 0 ) 'Calculate Pi.
AND
Used to perform a logical conjunction on two expressions.
Syntax
result = expr1 And expr2
Remarks
If, and only if, both expressions evaluate True, result is True. If either
expression evaluates False, result is False. The following table illustrates how
result is determined:
If expr1 And expr2 The result
is is is
True True True
True False False
False True False
False False False
The And operator also performs a bit-wise comparison of identically
positioned bits in two numeric expressions and sets the corresponding bit in
result according to the following truth table:
- CR5000 Measurement and 1
- Control System 1
- Warranty and Assistance 2
- TABLE OF CONTENTS 3
- APPENDIX 4
- CR5000 MICROLOGGER 6
- OV2.1 Memory 9
- OV2.3 Data Tables 10
- OV3.2 PC9000 Installation 10
- OV3.3.1 File 13
- OV3.3.2 Edit 13
- OV4. Keyboard Display 15
- OV4.1 Data Display 16
- OV4.1.1 Real Time Tables 17
- CR5000 Overview 18
- OV4.2 Run/Stop Program 20
- OV4.3 File Display 21
- OV4.3.1 File: Edit 22
- OV4.4 Configure Display 23
- OV5. Specifications 24
- 1.2 Power Requirements 25
- 1.3 CR5000 Power Supplies 26
- 1.4 Solar Panels 28
- BOOST REGULATOR 29
- 1.7 CR5000 GROUNDING 30
- CR5000 ICROLOGGER 31
- 1.10 Maintenance 36
- BATTERY2 38
- (datalogger/cr5000) 38
- 2.1 Data Storage in CR5000 41
- 2.2 Internal Data Format 42
- 2.3 Data Collection 43
- 2.3.1.1 File Type 44
- 2.3.1.2 Collection Method 44
- 2.3.1.3 Table Selection 45
- 2.3.1.4 File Control 45
- 2.3.2 RealTime Write File 46
- 2.3.3 Logger Files Retrieve 47
- 2.3.4 Via PCMCIA PC Card 47
- 2.4 Data Format on Computer 50
- 2.4.2 TOA5 ASCII File Format 51
- 3.1.1 Voltage Range 55
- 3.1.4 SettlingTime 57
- 3.1.5 Integration 57
- Measurements 58
- 3.3 Signal Settling Time 59
- 3.4.1 Error Analysis 62
- Thermocouple Limits of Error 65
- Noise on Voltage Measurement 67
- Error Summary 69
- CR5000 Junction Box 70
- 3.7 Pulse Count Measurements 74
- 3.8 Self Calibration 75
- 4.1 Format Introduction 77
- 4.2 Programming Sequence 78
- 4.3 Example Program 80
- CallTable Temp 82
- 4.4 Numerical Entries 83
- 4.6 Flags 84
- 4.7 Parameter Types 85
- 'Calibration factors: 86
- Station Name 91
- Sub, Exit Sub, End Sub 91
- Subroutine Example 93
- 6.1 Data Table Declaration 95
- 6.2 Trigger Modifiers 96
- OpenInterval 97
- FillStop 99
- 6.3 Export Data Instructions 102
- TableOption 103
- BufferControl 103
- Highlimit, MinAmp, Form) 118
- Code Form 119
- Constant 119
- Measured raw data: 123
- 7.8 Digital I/O 128
- 7.9 Peripheral Devices 128
- 7.1 Voltage Measurements 129
- Integ, Mult, Offset) 130
- 7.3 Half Bridges 131
- 7.4 Full Bridges 134
- 7.5 Current Excitation 137
- 7.7 Self Measurements 141
- Calibrate (Dest, AllRanges) 142
- ± 10 mV) and resolution 146
- Silicon diodes 146
- . Resistor 146
- PortGet (Dest, Port) 147
- PortSet (Port, State) 148
- Pulse Channel 149
- PulseCountReset 151
- ReadIO (Dest, Mask) 151
- TimerIO 153
- WriteIO (Mask, Source) 154
- SDMAddress 156
- SEG TSEG q22 158
- Parameter 160
- & Data Type 160
- Description 165
- Result 167
- SDMSpeed (BitPeriod) 168
- SDMTrigger 168
- ValuesPerRep 170
- This is a blank page 172
- Instructions 173
- ACOS (Source) 174
- ASIN (Source) 175
- ATN (Source) 176
- AvgSpa (Dest, Swath, Source) 177
- Cos (Source) 179
- CosH (Source) 179
- Variable or 180
- Frac (Source) 183
- Int, Fix 186
- Log (Source) 187
- LOG10 (number) 187
- MemoryTest 188
- MaxSpa (Dest, Swath, Source) 188
- MinSpa (Dest, Swath, Source) 189
- Move (Dest, Swath, Source) 190
- Randomize 194
- RealTime 195
- RectPolar (Dest, Source) 196
- RMSSpa (Dest, Swath, Source) 197
- RND (Source) 197
- Sgn (Source) 201
- Sin (Source) 201
- SinH (Source) 202
- Sqr (Source) 202
- StdDevSpa 203
- Tan (Source) 203
- TANH (Source) 204
- Derived Math Functions 205
- Section 9. Program Control 207
- CallTable 208
- Data, Read, Restore 209
- ClockSet 209
- Delay (Option, Delay, Units) 210
- FileManage 212
- FileMark (TableName) 213
- For ... Next Statement 213
- Power Off 217
- RunDLDFile 218
- Reset Table 219
- Select Case Statement 221
- Slow Sequence 223
- While…Wend 227
- This is a blank 236
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