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reallog
7-21
7reallog
Purpose Natural logarithm for nonnegative real inputs.
Syntax Y = reallog(X)
Description reallog is an elementary function that operates element-wise on matrices.
reallog returns the natural logarithm of X. The domain of reallog is the set
of all nonnegative real numbers. If
X is negative or complex,reallog issues an
error message.
reallog is similar to the MATLAB log function;however, the domainof log is
much broader than the domain of
reallog. The domain of log includes all real
and all complex numbers. If
Y is real, you should use reallog rather than log
for two reasons.
First,subsequent accessof
Y may execute moreefficientlyif Y iscalculatedwith
reallog rather than with log.Usingreallog forces the MATLAB Compiler to
impute a real type to
X andY.Usinglog typicallyforcestheMATLAB Compiler
to impute a complex type to
Y.
Second, the compiled version of
reallog may run somewhat faster than the
compiledversionof
log. (However,the interpretedversio n of reallog may r un
somewhat slower than the interpreted version of
log.)
See Also exp, log, log2, logm, log10, realpow, realsqrt
- MATLAB Compiler 1
- How to Contact The MathWorks: 2
- Controlling Code Generation 6
- Error and Warning Messages 9
- Contents 10
- Introducing the 11
- Introduction 12
- Optimizations 13
- Additional Language Support 15
- Running Compiler from MATLAB 15
- Uses of the Compiler 17
- C Stand-Alone Applications 19
- C++ Stand-Alone Applications 19
- The MATLAB Compiler Family 22
- Generated Code Types 22
- Generated Wrapper Types 22
- Target Types 22
- Why Compile M-Files? 24
- Compatibility 26
- Installation 26
- Changed Library Name 26
- Changed Data Type Names 26
- Limitations and Restrictions 27
- Stand-Alone Applications 28
- Installation and 31
- Configuration 31
- UNIX Workstation 35
- Compiler Options Files 36
- Locating Options Files 37
- ANSI C or C++ Compiler 38
- Things to Be Aware of 38
- Choosing a Compiler 38
- Changing Compilers 39
- Creating MEX-Files 40
- Verifying from MATLAB 42
- Microsoft Windows on PCs 44
- Using an IDE 53
- Troubleshooting 56
- Troubleshooting the Compiler 58
- Getting Started 59
- How the Function Works 61
- Invoking the M-File 62
- Invoking the MEX-File 63
- Compiler Options and Macros 65
- Using the -S Option 66
- Using the -u and -y Options 67
- Sample Time 67
- Data Type 68
- Stand-Alone 71
- Applications 71
- MEX-Files 73
- Overview 75
- Introducing mbuild 77
- Using the System Compiler 79
- Locating Shared Libraries 82
- Running Your Application 83
- About the mbuild Script 85
- Shared Libraries 92
- Add-ins and Macro Files tab 95
- Building Shared Libraries 97
- 4 Stand-Alone Applications 100
- Coding with M-Files Only 101
- Mixing M-Files and C or C++ 107
- The Build Process 108
- An Explanation of mrankp.c 111
- An Explanation of This C Code 114
- Controlling 117
- Code Generation 117
- 5 Controlling Code Generation 118
- Code Generation Overview 119
- Sierpinski Gasket M-File 119
- The Generated Header Files 124
- C++ Header File 125
- Internal Interface Functions 127
- Interface Function 127
- Supported Executable Types 136
- POSIX Main Wrapper 137
- Simulink S-Functions 139
- C Libraries 139
- Default Width 145
- Setting Indentation Spacing 147
- Modified Indentation 149
- Comments Annotation 150
- All Annotation 151
- Include #line Directives 153
- Using feval 158
- Compiling MEX-Files 159
- Print Handlers 160
- Registering a Print Handler 161
- Writing a Print Handler 161
- Example Files 164
- Registering the Print Handler 165
- Building the Executable 167
- Testing the Executable 167
- Optimizing Performance 169
- 6 Optimizing Performance 170
- Optimization Bundles 171
- Turn On All Optimizations 171
- Turn Off All Optimizations 171
- List All Optimizations 172
- Optimizing Arrays 173
- Optimizing Loops 175
- Optimizing Conditionals 178
- Reference 179
- Command Line Tools 181
- Compiler pragmas 182
- , %#function,and%#mex 182
- 7%#external 183
- Syntax %#external 183
- 7%#function 184
- Purpose feval pragma 184
- Purpose mex pragma 185
- Syntax %#mex 185
- Functions 186
- Syntax mbchar(x) 187
- Description The statement 187
- Syntax mbcharscalar(x) 188
- Syntax mbcharvector(x) 189
- Syntax mbint(n) 190
- , mbintvector, mcc 191
- Syntax mbintscalar(n) 192
- See Also mbint, mbscalar, mcc 192
- Syntax mbintvector(n) 193
- Syntax mbreal(n) 194
- Syntax mbrealscalar(n) 195
- Syntax mbrealvector(n) 196
- Syntax mbscalar(n) 197
- Syntax mbvector(n) 198
- 7reallog 199
- Syntax Y = reallog(X) 199
- 7realpow 200
- Syntax Z = realpow(X,Y) 200
- 7realsqrt 201
- Syntax Y = realsqrt(X) 201
- Command Line Syntax 208
- Setting Up Default Options 210
- Handling Full Pathnames 212
- Compiling Embedded M-Files 213
- Macro Options 214
- Code Generation Options 216
- Quick Reference 227
- Common Uses of the Compiler 228
- Specifies path for library 233
- Displays help message 233
- Error and Warning 235
- Messages 235
- B Error and Warning Messages 236
- Compile-Time Errors 237
- Warning Messages 247
- Run-Time Errors 253
- -x option flag 7-37 264
- -Y option flag 7-45 264
- -y option flag 3-9, 7-42 264
- -z option flag 7-46 264
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