mwArray的用法

忘是亡心i 2022-02-20 14:54 249阅读 0赞

mwArray ：Ｃ++用它向ＭＡＴＬＡＢ传递输　i/o 参数。MATLAB中的参数都是矩阵表示，哪怕是1\*1的矩阵。

1）构造函数

[mwArray(mwSize num\_rows, const mwSize num\_cols, mxClassID mxID,mxComplexity cmplx = mxREAL)][mwArray_mwSize num_rows_ const mwSize num_cols_ mxClassID mxID_mxComplexity cmplx _ mxREAL]

*num\_rows*　：行数；　*num\_cols*　：列数；[mxID][mwArray_mwSize num_rows_ const mwSize num_cols_ mxClassID mxID_mxComplexity cmplx _ mxREAL]：The data type type of the matrix.：　*cmplx：*The complexity of the matrix (numeric types only).

mwArray a(2, 2, mxDOUBLE\_CLASS);

mwArray b(3, 3, mxSINGLE\_CLASS, mxCOMPLEX);

mwArray c(2, 3, mxCELL\_CLASS);

[　　　　mwArray(mwSize num\_rows, mwSize num\_cols, mxClassID mxID,mxComplexity cmplx = mxREAL)][mwArray_mwSize num_rows_ mwSize num_cols_ mxClassID mxID_mxComplexity cmplx _ mxREAL]

[　　　　　mwArray(const char\* str)][mwArray_const char_ str]

[　　　mwArray(mwSize num\_strings, const char\*\* str)][mwArray_const char_ str]

[mwArray(mwSize num\_rows, mwSize num\_cols, int num\_fields,const char\*\* fieldnames)][mwArray_mwSize num_rows_ mwSize num_cols_ int num_fields_const char_ fieldnames]

[mwArray(mwSize num\_dims, const mwSize\* dims, int num\_fields,const char\*\* fieldnames)][mwArray_mwSize num_dims_ const mwSize_ dims_ int num_fields_const char_ fieldnames]

[mwArray(const mwArray& arr)][mwArray_const mwArray_ arr]

[mwArray( re)][mwArray_ re]

[mwArray( re, im)][mwArray_ re_ im]

２）　方法

[mwArray SharedCopy() const][mwArray SharedCopy_ const]

[mwArray Serialize() const][mwArray Serialize_ const]

[mxClassID ClassID() const][mxClassID ClassID_ const]

[int ElementSize() const][int ElementSize_ const]

[size\_t ElementSize() const][size_t ElementSize_ const]

[mwSize NumberOfElements() const][mwSize NumberOfElements_ const]

[mwSize NumberOfNonZeros() const][mwSize NumberOfNonZeros_ const]

[mwSize MaximumNonZeros() const][mwSize MaximumNonZeros_ const]

[mwSize NumberOfDimensions() const][mwSize NumberOfDimensions_ const]

[int NumberOfFields() const][int NumberOfFields_ const]

[mwString GetFieldName(int index)][mwString GetFieldName_int index]

[mwArray GetDimensions() const][mwArray GetDimensions_ const]

[bool IsEmpty() const][bool IsEmpty_ const]

[bool IsSparse() const][bool IsSparse_ const]

[bool IsNumeric() const][bool IsNumeric_ const]

[bool IsComplex() const][bool IsComplex_ const]

[bool Equals(const mwArray& arr) const][bool Equals_const mwArray_ arr_ const]

[int CompareTo(const mwArray& arr) const][int CompareTo_const mwArray_ arr_ const]

[int HashCode() const][int HashCode_ const]

[mwString ToString() const][mwString ToString_ const]

[mwArray RowIndex() const][mwArray RowIndex_ const]

[mwArray ColumnIndex() const][mwArray ColumnIndex_ const]

[void MakeComplex()][void MakeComplex]

[mwArray Get(mwSize num\_indices, ...)][mwArray Get_mwSize num_indices_ ...]

[mwArray Get(const char\* name, mwSize num\_indices, ...)][mwArray Get_const char_ name_ mwSize num_indices_ ...]

[mwArray Get(mwSize num\_indices, const mwIndex\* index)][mwArray Get_mwSize num_indices_ const mwIndex_ index]

[mwArray Get(const char\* name, mwSize num\_indices, const mwIndex\*index)][mwArray Get_const char_ name_ mwSize num_indices_ const mwIndex_index]

\#include "mclcppclass.h"

double data\[4\] = \{1.0, 2.0, 3.0, 4.0\};

double x;

mwArray a(2, 2, mxDOUBLE\_CLASS);

a.SetData(data, 4);

x = a.Get(1,1); // x = 1.0

x = a.Get(2, 1, 2); // x = 3.0

x = a.Get(2, 2, 2); // x = 4.0

[mwArray Real()][mwArray Real]

[mwArray Imag()][mwArray Imag]

[void Set(const mwArray& arr)][void Set_const mwArray_ arr]

[void GetData(\* buffer, mwSize len) const][void GetData_ buffer_ mwSize len_ const]

[void GetLogicalData(mxLogical\* buffer, mwSize len) const][void GetLogicalData_mxLogical_ buffer_ mwSize len_ const]

[void GetCharData(mxChar\* buffer, mwSize len) const][void GetCharData_mxChar_ buffer_ mwSize len_ const]

[void SetData(\* buffer, mwSize len)][void SetData_ buffer_ mwSize len]

\#include "mclcppclass.h"

double rdata\[4\] = \{1.0, 2.0, 3.0, 4.0\};

double data\_copy\[4\] ;

mwArray a(2, 2, mxDOUBLE\_CLASS);

a.SetData(rdata, 4);

a.GetData(data\_copy, 4); // 取出a中的数据。

[void SetLogicalData(mxLogical\* buffer, mwSize len)][void SetLogicalData_mxLogical_ buffer_ mwSize len]

[void SetCharData(mxChar\* buffer, mwSize len)][void SetCharData_mxChar_ buffer_ mwSize len]

4. mwArray 与 mxArray的用法区别:

Seventy  
http://www.simwe.com/forum/post/view?bid=19&id=361497&sty=1&tpg=7&age=100  
  
首先，mxArray是Matlab C 函数库的结构体，而mwArray是Matlab C++ 函数库中对mxArray的包装类。  
其次，二者的内存管理方式不同。mxArray的内存管理方式比较松散，由于是C函数库，没有数据封装，必须对临时阵列和约束阵列的概念极为明确，并且须小心地防止内存泄漏（要多写好多代码）。尽管有自动内存管理机制（mlfEnterNewContext，mlfReleasePreviousContext），仍然要处处调用mlfAssign，麻烦得很。然而mwArray就好的多，一切交给C++对象去搞定，你只要放心地用就可以了。不过Matlab C++函数库为了防止频繁内存分配和释放重写了内存分配和释放等函数。你会发现对于mwArray a,b; a=b;实际上并没有生成两个相同数据块，只是指针，只有发成数据改变时才copy完整数据。  
再次，这两个东西各自有一套与之相对应的函数。函数的返回值类型不同，需要多加注意。  
最后，用的时候mxArray要使用指针，而mwArray直接当类对象使。如果你不是Hardcore级的牛人或具有Hardcore倾向的潜牛人，我强烈建议你使用后者！  
  
举一个简单的例子：如果你需要计算c=a+b那么两者的区别是这样的：  
  
mxArray:  
void fun()\{  
……  
double d\_a=1,d\_b=2;  
mxArray \*a,\*b,\*c;  
mlfEnterNewContext(0,0);  
mlfAssign(&a,mlfScalar(d\_a));  
mlfAssign(&b,mlfScalar(d\_b));  
mlfAssign(&c,mlfPlus(a,b));  
……  
mlfReleasePreviousContext(0,0);  
mxDestroyArray(a);  
mxDestroyArray(b);  
mxDestroyArray(c);  
\}  
  
mwArray:  
void fun()\{  
……  
mwArray a,b,c;  
a=1;  
b=2;  
c=a+b;  
……  
\}

[mwArray_mwSize num_rows_ const mwSize num_cols_ mxClassID mxID_mxComplexity cmplx _ mxREAL]: http://www.mathworks.com/help/toolbox/compiler/mwarraymwsizenum_dimsconstmwsizedimsmxclassidmxidmxcomplexitycmplxmxreal.html
[mwArray_mwSize num_rows_ mwSize num_cols_ mxClassID mxID_mxComplexity cmplx _ mxREAL]: http://www.mathworks.com/help/toolbox/compiler/mwarrayconstcharstr.html
[mwArray_const char_ str]: http://www.mathworks.com/help/toolbox/compiler/mwarraymwsizenum_sconstcharstr.html
[mwArray_mwSize num_rows_ mwSize num_cols_ int num_fields_const char_ fieldnames]: http://www.mathworks.com/help/toolbox/compiler/mwarraymwsizenum_rowsmwsizenum_colsintnum_fieldsconstcharfieldnames.html
[mwArray_mwSize num_dims_ const mwSize_ dims_ int num_fields_const char_ fieldnames]: http://www.mathworks.com/help/toolbox/compiler/mwarraymwsizenum_dimsconstmwsizedimsintnum_fieldsconstcharfieldnames.html
[mwArray_const mwArray_ arr]: http://www.mathworks.com/help/toolbox/compiler/mwarrayconstmwarrayarr.html
[mwArray_ re]: http://www.mathworks.com/help/toolbox/compiler/mwarraytypere.html
[mwArray_ re_ im]: http://www.mathworks.com/help/toolbox/compiler/mwarraytyperetypeim.html
[mwArray SharedCopy_ const]: http://www.mathworks.com/help/toolbox/compiler/mwarraysharedcopyconst.html
[mwArray Serialize_ const]: http://www.mathworks.com/help/toolbox/compiler/mwarrayserializeconst.html
[mxClassID ClassID_ const]: http://www.mathworks.com/help/toolbox/compiler/mxclassidclassidconst.html
[int ElementSize_ const]: http://www.mathworks.com/help/toolbox/compiler/intelementsizeconst.html
[size_t ElementSize_ const]: http://www.mathworks.com/help/toolbox/compiler/size_telementsizeconst.html
[mwSize NumberOfElements_ const]: http://www.mathworks.com/help/toolbox/compiler/mwsizenumberofelementsconst.html
[mwSize NumberOfNonZeros_ const]: http://www.mathworks.com/help/toolbox/compiler/mwsizenumberofnonzerosconst.html
[mwSize MaximumNonZeros_ const]: http://www.mathworks.com/help/toolbox/compiler/mwsizemaximumnonzerosconst.html
[mwSize NumberOfDimensions_ const]: http://www.mathworks.com/help/toolbox/compiler/mwsizenumberofdimensionsconst.html
[int NumberOfFields_ const]: http://www.mathworks.com/help/toolbox/compiler/intnumberoffieldsconst.html
[mwString GetFieldName_int index]: http://www.mathworks.com/help/toolbox/compiler/mwgetfieldnameintindex.html
[mwArray GetDimensions_ const]: http://www.mathworks.com/help/toolbox/compiler/mwarraygetdimensionsconst.html
[bool IsEmpty_ const]: http://www.mathworks.com/help/toolbox/compiler/boolisemptyconst.html
[bool IsSparse_ const]: http://www.mathworks.com/help/toolbox/compiler/boolissparseconst.html
[bool IsNumeric_ const]: http://www.mathworks.com/help/toolbox/compiler/boolisnumericconst.html
[bool IsComplex_ const]: http://www.mathworks.com/help/toolbox/compiler/booliscomplexconst.html
[bool Equals_const mwArray_ arr_ const]: http://www.mathworks.com/help/toolbox/compiler/boolequalsconstmwarrayarrconst.html
[int CompareTo_const mwArray_ arr_ const]: http://www.mathworks.com/help/toolbox/compiler/intcomparetoconstmwarrayarrconst.html
[int HashCode_ const]: http://www.mathworks.com/help/toolbox/compiler/inthashcodeconst.html
[mwString ToString_ const]: http://www.mathworks.com/help/toolbox/compiler/mwtoconst.html
[mwArray RowIndex_ const]: http://www.mathworks.com/help/toolbox/compiler/mwarrayrowindexconst.html
[mwArray ColumnIndex_ const]: http://www.mathworks.com/help/toolbox/compiler/mwarraycolumnindexconst.html
[void MakeComplex]: http://www.mathworks.com/help/toolbox/compiler/voidmakecomplex.html
[mwArray Get_mwSize num_indices_ ...]: http://www.mathworks.com/help/toolbox/compiler/mwarraygetmwsizenum_indices....html
[mwArray Get_const char_ name_ mwSize num_indices_ ...]: http://www.mathworks.com/help/toolbox/compiler/mwarraygetconstcharnamemwsizenum_indices....html
[mwArray Get_mwSize num_indices_ const mwIndex_ index]: http://www.mathworks.com/help/toolbox/compiler/mwarraygetmwsizenum_indicesconstmwindexindex.html
[mwArray Get_const char_ name_ mwSize num_indices_ const mwIndex_index]: http://www.mathworks.com/help/toolbox/compiler/mwarraygetconstcharnamemwsizenum_indicesconstmwindexindex.html
[mwArray Real]: http://www.mathworks.com/help/toolbox/compiler/mwarrayreal.html
[mwArray Imag]: http://www.mathworks.com/help/toolbox/compiler/mwarrayimag.html
[void Set_const mwArray_ arr]: http://www.mathworks.com/help/toolbox/compiler/voidsetconstmwarrayarr.html
[void GetData_ buffer_ mwSize len_ const]: http://www.mathworks.com/help/toolbox/compiler/voidgetdatanumerictypebuffermwsizelenconst.html
[void GetLogicalData_mxLogical_ buffer_ mwSize len_ const]: http://www.mathworks.com/help/toolbox/compiler/voidgetlogicaldatamxlogicalbuffermwsizelenconst.html
[void GetCharData_mxChar_ buffer_ mwSize len_ const]: http://www.mathworks.com/help/toolbox/compiler/voidgetchardatamxcharbuffermwsizelenconst.html
[void SetData_ buffer_ mwSize len]: http://www.mathworks.com/help/toolbox/compiler/voidsetdatanumerictypebuffermwsizelen.html
[void SetLogicalData_mxLogical_ buffer_ mwSize len]: http://www.mathworks.com/help/toolbox/compiler/voidsetlogicaldatamxlogicalbuffermwsizelen.html
[void SetCharData_mxChar_ buffer_ mwSize len]: http://www.mathworks.com/help/toolbox/compiler/voidsetchardatamxcharbuffermwsizelen.html