qt使用matio将新二维数据拼接到mat文件中
时间: 2024-04-29 13:22:21 浏览: 8
在Qt中使用matio库将新的二维数据拼接到mat文件中,可以参考下面的代码:
```cpp
#include <matio.h>
void appendDataToMatFile(const QString& filePath, const QString& varName, const matvar_t* data)
{
// Open mat file
mat_t* matfp = Mat_Open(filePath.toStdString().c_str(), MAT_ACC_RDWR);
if (!matfp)
{
qCritical() << "Failed to open mat file:" << filePath;
return;
}
// Get variable of varName
matvar_t* var = Mat_VarRead(matfp, varName.toStdString().c_str());
if (!var)
{
qCritical() << "Failed to read variable:" << varName << "from mat file:" << filePath;
Mat_Close(matfp);
return;
}
// Append data to variable
if (var->rank == 2 && data->rank == 2 && var->dims[0] == data->dims[0])
{
// Create new variable with appended data
size_t dims[2] = { var->dims[0], var->dims[1] + data->dims[1] };
matvar_t* newVar = Mat_VarCreate(varName.toStdString().c_str(), MAT_C_DOUBLE, MAT_T_DOUBLE, 2, dims, data->data, MAT_F_DONT_COPY_DATA);
if (!newVar)
{
qCritical() << "Failed to create new variable:" << varName;
Mat_VarFree(var);
Mat_Close(matfp);
return;
}
// Overwrite original variable with new variable
int success = Mat_VarWrite(matfp, newVar, MAT_COMPRESSION_NONE);
Mat_VarFree(newVar);
if (success != 0)
{
qCritical() << "Failed to overwrite variable:" << varName;
Mat_VarFree(var);
Mat_Close(matfp);
return;
}
}
else
{
qCritical() << "Invalid variable dimensions or ranks";
}
// Close mat file
Mat_VarFree(var);
Mat_Close(matfp);
}
```
使用方法:
```cpp
// Load data to append
double newData[3][2] = {{11, 12}, {21, 22}, {31, 32}};
size_t dims[2] = { 3, 2 };
matvar_t* data = Mat_VarCreate("newData", MAT_C_DOUBLE, MAT_T_DOUBLE, 2, dims, newData, 0);
// Append data to mat file
QString filePath = "/path/to/mat/file.mat";
QString varName = "myVar";
appendDataToMatFile(filePath, varName, data);
// Free memory
Mat_VarFree(data);
```
其中,`filePath`是mat文件路径,`varName`是要拼接数据的变量名,`data`是要拼接的二维数据。如果拼接成功,原始的mat文件中的`varName`变量会被覆盖为拼接后的新变量。