error: no matching function for call to ‘format(cv::Mat&, const char [4])’

[loseyourself-gan]

/home/ubuntu/svo_edgelet-master/src/feature_detection.cpp: In function ‘void svo::feature_detection::saveMatToCsv(cv::Mat, std::string)’:
/home/ubuntu/svo_edgelet-master/src/feature_detection.cpp:28:39: error: no matching function for call to ‘format(cv::Mat&, const char [4])’
28 | outputFile <<cv::format(data,"CSV")<<endl;
| ^
In file included from /usr/local/include/opencv4/opencv2/core.hpp:3302,
from /usr/local/include/opencv4/opencv2/opencv.hpp:52,
from /home/ubuntu/svo_edgelet-master/include/svo/global.h:28,
from /home/ubuntu/svo_edgelet-master/include/svo/feature_detection.h:20,
from /home/ubuntu/svo_edgelet-master/src/feature_detection.cpp:17:
/usr/local/include/opencv4/opencv2/core/operations.hpp:430:19: note: candidate: ‘cv::String cv::format(const char*, ...)’
430 | CV_EXPORTS String format( const char* fmt, ... ) CV_FORMAT_PRINTF(1, 2);
| ^~~~~~
/usr/local/include/opencv4/opencv2/core/operations.hpp:430:39: note: no known conversion for argument 1 from ‘cv::Mat’ to ‘const char*’
430 | CV_EXPORTS String format( const char* fmt, ... ) CV_FORMAT_PRINTF(1, 2);
| ~~~~~~~~~~~~^~~
/usr/local/include/opencv4/opencv2/core/operations.hpp:435:16: note: candidate: ‘cv::Ptrcv::Formatted cv::format(cv::InputArray, cv::Formatter::FormatType)’
435 | Ptr format(InputArray mtx, Formatter::FormatType fmt)
| ^~~~~~
/usr/local/include/opencv4/opencv2/core/operations.hpp:435:61: note: no known conversion for argument 2 from ‘const char [4]’ to ‘cv::Formatter::FormatType’
435 | Ptr format(InputArray mtx, Formatter::FormatType fmt)
| ~~~~~~~~~~~~~~~~~~~~~~^~~
/home/ubuntu/svo_edgelet-master/src/feature_detection.cpp: In member function ‘virtual void svo::feature_detection::EdgeDetector::detect(svo::Frame*, const ImgPyr&, double, svo::Features&)’:
/home/ubuntu/svo_edgelet-master/src/feature_detection.cpp:545:15: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vectorsvo::feature_detection::Edgelete::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
545 | int a = (n>edge_list.size())? edge_list.size():n;
| ~^~~~~~~~~~~~~~~~~
make[2]: *** [CMakeFiles/svo.dir/build.make:303：CMakeFiles/svo.dir/src/feature_detection.cpp.o] 错误 1
make[1]: *** [CMakeFiles/Makefile2:179：CMakeFiles/svo.dir/all] 错误 2
make: *** [Makefile:84：all] 错误 2

[HeYijia]

I fixed the bug and tested with opencv3.