>> vl_compilenn
警告: CL.EXE not found in PATH. Trying to guess out of mex setup.
> In vl_compilenn>check_clpath (line 650)
In vl_compilenn (line 426)
'cl.exe' 不是內部或外部命令，也不是可運行的程序
或批處理文件。
錯誤使用 vl_compilenn>check_clpath (line 656)
Unable to find cl.exe
出錯 vl_compilenn (line 426)
cl_path = fileparts(check_clpath()); % check whether cl.exe in path
問題在https://github.com/vlfeat/matconvnet/issues/650有解決辦法
the problem is with the visual studio setup folder layout
The matconvnet 'vl_compilenn' is trying to find for cl.exe in 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\bin\amd64'. which has changed with new setup of visual studio.
If you have installed latest versions of Visual studio try searching for the 'cl.exe' in the subfolders below 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC'
eg: when i searched 'cl.exe' ; i found it under 'C:\Program Files (x86)\Microsoft Visual Studio\2017\Community\VC\Tools\MSVC\14.13.26128\bin\Hostx86\x86'
so for above path i replace the variable 'cl_path' in 'vl_compilenn' line 646 (function- check_clpath)
from --> cl_path = fullfile(cc.Location, 'VC', 'bin', 'amd64'); (in matconvnet beta 25)
to --> cl_path = fullfile(cc.Location, 'VC', 'Tools','MSVC','14.13.26128','bin','Hostx64','x64');
let me know if it works
14.13.26128改你的文件名（相同就不用改）
在vl_compilenn.m中修改改行代碼
cl_path = fullfile(cc.Location, 'VC', 'Tools', 'MSVC','14.16.27023','bin','Hostx64','x64');
問題就解決了