MEX-file error matlab please help

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kingh12

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Can't you download the midi2nmat.m and nmat2midi.m files and use them instead of readmidi, etc.? Just download the files and put them in the miditoolbox directory
 
I tried that like you said but nothing changed. I downloaded both files and put them into that directory. After that, I tried the same code but the same error appeared. Do I have to do something more in matlab? I just did copy-paste..
 
dougy83, thank you very much! I am new at matlab and I didn't know that I had to call another command..I was trying to use readmidi command...now I tried midi2nmat command and it is ok! one more question.. these midi2nmat and nmat2midi are just for readmidi command? Will I meet with another problem on using another codes?
 
midi2nmat replaces the readmidi command. The writemidi command should be replaced with nmat2midi if you need to use it.
 
If you're using windows, to play the midi file, just use the following code. 'nmat' is your midi information nmat variable
Code: 
nmat2midi(nmat, 'test.mid'); 
system('test.mid');
 
I've just tried to "write" a midi file basicly. First I read a midi file and then tried to write it with another name to the directory. The code I wrote is;

"
>> nmat=midi2nmat('laksin.mid');
>> nmat2midi(nmat,'test.mid');
Tracks: 1 Format: 0
track chunks... "

What does "track chunks" mean? format=0 ?
I think I am missing something that the written midi file doesn't work. Both I double-clicked the created new test.mid file in the directory or used the code "system('test.mid') in matlab; but it didn't play. I am sure that the problem is in written midi file because when I try to play another midi files, there isn't any problem.

By the way thanks for your "playmidi" comment
 
Last edited:
The problem is the output file is written incorrectly. The author forgot to include the end of track message.

Please find modified file attached.
 

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  • nmat2midi.zip
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dougy83 said:
The problem is the output file is written incorrectly. The author forgot to include the end of track message.

Please find modified file attached.
Click to expand...
midi2nmat is not working for some midi files. Giving as error:
Attempted to access tmp2(1); index out of bounds because numel(tmp2)=0.

Error in midi2nmat (line 68)
tmp2=tmp2(1);
 
royuttam said:
midi2nmat is not working for some midi files. Giving as error:
Attempted to access tmp2(1); index out of bounds because numel(tmp2)=0.

Error in midi2nmat (line 68)
tmp2=tmp2(1);
Click to expand...

Hi,
I added guard that prevent empty vector that caused troubles. However this function was originally written by someone else, so I can only hope it will help. Please tell me if it does.
Code: 
if all(~time_index)
    time_index(end) = true;
end
% next line for reference
timeratio = tempos(i)/tempos(1);
 

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  • midi2nmat2.m.zip
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dougy83 said:
Can't you download the midi2nmat.m and nmat2midi.m files and use them instead of readmidi, etc.? Just download the files and put them in the miditoolbox directory
Click to expand...

midi2nmat (and nmat2midi) includes old versions of functions copied and pasted from matlab-midi repository (by Ken Schutte). It is much better to comment out this part of midi2nmat, and download recent versions of Ken Schutte code, and place it where Matlab can see it (meaning midi2nmat can make use of it).
Best of luck.
 
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