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realpow
7-22
7realpow
Purpose Array power function for real-only output.
Syntax Z = realpow(X,Y)
Description realpow returns X raised to the Y power. realpow operates element-wise on
matrices. The range of
realpow is the set of all real numbers. In other words,
if
Xra ised totheY poweryieldsacomplexanswer,thenrealpow doesnotreturn
an answer. Instead,
realpow signals an error.
If
X is negative and Y is not an integer, the resulting power is complex and
realpow signals an error.
realpow is similar to the array power operator (.^) of MATLAB. However, the
range of
.^ is much broader than the range of realpow.(Therangeof.^
includes all real and all imaginary numbers.) If X raised to the Y power yields
a complex answer, then you must use
.^ instead of realpow. However, if X
raised to the Y power yields a real answer, then you should use realpow for two
reasons.
First,subsequentaccessof
Zmayexecutemoreefficiently if Z iscalculatedwith
realpow rather than .^.Usingrealpow forces the MATLAB Compiler to
impute that
Z, X,andY are real. Using .^ typically forces the MATLAB
Compiler to impute the complex type to
Z.
Second, the compiled version of
realpow may run somewhat faster than the
compiled version of
.^. (However, the interpreted version of realpow may run
somewhat slower than the interpreted version of
.^.)
See Also exp, log, log2, logm, log10, reallog, 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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