MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario Pagina 81
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Examples of C MEX-Files
2-21
Handling Complex Data
Complex data from MATLAB is separated into real and imaginary parts.
MATLAB’s API provides two functions,
mxGetPr and mxGetPi, that return
pointers (of type
double *) to the real and imaginary parts of your data.
This example takes two complex row vectors and convolves them.
/* $Revision: 1.8 $ */
/*=========================================================
* convec.c
* Example for illustrating how to pass complex data
* from MATLAB to C and back again
*
* Convolves two complex input vectors.
*
* This is a MEX-file for MATLAB.
* Copyright (c) 1984-2000 The MathWorks, Inc.
*=======================================================*/
#include "mex.h"
/* Computational subroutine */
void convec( double *xr, double *xi, int nx,
double *yr, double *yi, int ny,
double *zr, double *zi)
{
int i,j;
zr[0] = 0.0;
zi[0] = 0.0;
/* Perform the convolution of the complex vectors. */
for(i = 0; i < nx; i++) {
for(j = 0; j < ny; j++) {
*(zr+i+j) = *(zr+i+j) + *(xr+i) * *(yr+j) - *(xi+i)
* *(yi+j);
*(zi+i+j) = *(zi+i+j) + *(xr+i) * *(yi+j) + *(xi+i)
* *(yr+j);
}
}
}
- External Interfaces 1
- How to Contact The MathWorks: 2
- Creating Fortran MEX-Files 5
- Calling Java from MATLAB 6
- Serial Port I/O 10
- Contents 12
- Calling C and Fortran 13
- Programs from MATLAB 13
- Introducing MEX-Files 15
- MATLAB Data 18
- Numeric Matrices 19
- MATLAB Strings 19
- Sparse Matrices 19
- Cell Arrays 20
- Structures 20
- Multidimensional Arrays 20
- Logical Arrays 21
- Empty Arrays 21
- The explore Example 21
- Building MEX-Files 23
- Selecting a Compiler 24
- Preconfigured Options Files 29
- Custom Building MEX-Files 32
- Default Options File on UNIX 34
- The User Profile Directory 35
- Compile Stage 36
- Link Stage 36
- Build Options 37
- Prelink Stage 39
- Linking DLLs to MEX-Files 40
- Versioning MEX-Files 40
- •See the 43
- Troubleshooting 44
- DLLs Not on Path on Windows 44
- General Configuration Problem 45
- UNIX only 46
- MEX-files only 46
- Potential Memory Leaks 52
- Additional Information 54
- <matlab>/bin 55
- <matlab>/extern/include 56
- <matlab>/extern/src 56
- <matlab>\bin\win32 57
- <matlab>\extern\include 58
- <matlab>\extern\src 58
- Examples From the Text 58
- MEX Reference Examples 59
- MX Examples 59
- Engine and MAT Examples 59
- Technical Support 60
- Creating C Language 61
- C MEX-Files 63
- Examples of C MEX-Files 67
- that returns the values of 70
- Passing Strings 71
- The results of this input are 80
- Handling Complex Data 81
- Handling Sparse Arrays 89
- Persistent Arrays 98
- Hybrid Arrays 100
- Specifying the Function Name 101
- Handling Complex Numbers 102
- Advanced Topics 103
- Building the MEX-File 104
- Creating C Language MEX-Files 106
- Debugging on UNIX 107
- Microsoft Compiler 108
- Watcom Compiler 109
- Creating Fortran 111
- MEX-Files 111
- 3 Creating Fortran MEX-Files 112
- Fortran MEX-Files 113
- The Pointer Concept 115
- The Gateway Routine 116
- Examples of Fortran MEX-Files 119
- Passing Matrices 127
- Dynamically Allocating Memory 135
- Memory Management 147
- Compaq Visual Fortran 149
- Calling MATLAB from C 151
- Using the MATLAB Engine 153
- Communicating with MATLAB 154
- GUI-Intensive Applications 155
- Return continues the program 160
- Open field, type 166
- OK. This starts MATLAB 166
- Setting Runtime Library Path 168
- Compiling and Linking 169
- Calling Java from 171
- 5 Calling Java from MATLAB 172
- Sources of Java Classes 175
- Defining New Java Classes 175
- Using the javaObject Function 180
- Examples 186
- Assigning to a Static Field 187
- Working with Java Arrays 199
- Array Access from Java 201
- Array Access from MATLAB 201
- Array One-dimensional Array 201
- Array Indexing 202
- The Shape of the Java Array 202
- Using the javaArray Function 204
- Using the Colon Operator 207
- Using END in a Subscript 209
- Assigning to a Linear Array 211
- Assigning the Empty Matrix 211
- Subscripted Deletion 212
- Concatenating Java Arrays 213
- Passing Data to a Java Method 216
- Passing String Arguments 219
- Passing Strings in an Array 220
- Passing Objects in an Array 222
- Other Data Conversion Topics 223
- Empty Matrices and Nulls 224
- Built-In Data Types 227
- Java Objects 227
- Example – Reading a URL 233
- 1. Construct a URL Object 233
- Running the Example 237
- 3. Open the Serial Port 239
- 4. Configure the Serial Port 240
- 10. Close the Serial Port 241
- 3. Create a Hash Table 245
- 4. Create a File Input Stream 245
- 1. Input the Entry to Add 249
- Running the phonebook Program 253
- Importing and Exporting 257
- Importing and Exporting Data 258
- Using MAT-Files 259
- Exporting Data from MATLAB 260
- Use the Save command 261
- Use MATLAB I/O functions 261
- MAT-File Interface Library 262
- Finding Associated Files 264
- Include Files 265
- Libraries 265
- Example Files 265
- Examples of MAT-Files 267
- Reading a MAT-File in C 272
- Reading a MAT-File in Fortran 280
- Using the Options File 286
- ActiveX and DDE Support 287
- 7 ActiveX and DDE Support 288
- ActiveX Interfaces 289
- MATLAB ActiveX Client Support 292
- Creating ActiveX Objects 292
- Manipulating the Interface 292
- Writing Event Handlers 294
- Converting Data 297
- MATLAB Sample Control 299
- % Workbook.Saved = 1; 301
- % Quit Excel 301
- Dynamic Data Exchange (DDE) 309
- The Service Name 310
- The Topic 310
- The Item 310
- Clipboard Formats 310
- Accessing MATLAB As a Server 311
- MATLAB System Topic 312
- MATLAB Engine Topic 313
- Requesting Data from MATLAB 314
- Sending Data to MATLAB 315
- Using MATLAB As a Client 317
- Introduction 322
- Overview of the Serial Port 324
- 8 Serial Port I/O 326
- Signal States 328
- The Data Pins 329
- The Control Pins 329
- Bytes Versus Values 331
- How Are the Bits Transmitted? 332
- Start and Stop Bits 333
- Data Bits 333
- The Parity Bit 334
- Windows Platform 335
- UNIX Platform 336
- Selected Bibliography 337
- , or readasync function 339
- Configuring Property Values 342
- Specifying Property Names 343
- Default Property Values 343
- Creating a Serial Port Object 344
- Connecting to the Device 347
- function 349
- Writing Data 351
- Writing and Reading Data 353
- Writing Text Data 354
- Writing Binary Data 356
- Reading Text Data 359
- A read operation with fscanf 361
- , then you must issue the 362
- . RS232? 364
- Example: Reading Binary Data 365
- Viewing the Bitmap Data 366
- Events and Callbacks 368
- MATLAB workspace 375
- Using Control Pins 376
- Hardware Handshaking 379
- Software Handshaking 380
- End the serial port session 383
- The Record File Contents 386
- Saving and Loading 388
- Disconnecting and Cleaning Up 389
- Property Reference 390
- Serial Port Object Properties 391
- Index 395
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