Anyone know where I can find the source code for conv2.m?
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コメント済み: Walter Roberson 2016 年 5 月 1 日
I have been debugging a ginormous program for the past 6 hours, and have finally isolated the issue down a single function: conv2.m
The bug I ran into was that the output of this program was varying between machines (obviously not ideal given that I prefer my computers to behave in a deterministic manner). All other variables have seriously already been looked into, so don't bother offering other suggestions. The issue is that conv2.m is performing different on different machines. I would like to include this source code into my program so that that does not happen. Anyone know where I can access it?
Renato Agurto 2016 年 4 月 29 日
編集済み: Renato Agurto 2016 年 4 月 29 日
this is a built-in function (like mean, max, sum, etc), not a funtion programmed as a .m file. What you see when you type.
is just there to display the help text
If it's giving you problems, you could try to write the funtion yourself (my_conv2.m). See the documentation for conv2; section Algorithms
その他の回答 (2 件)
J. Webster 2016 年 4 月 29 日
I found this. Though I couldn't tell you if its the one that works for you or not.
I post with the caveat that I don't really know what mathwork's position on this would be. I suspect the reason that the source can't be found in a .m file is because it was converted to C or assembly or something to improve the speed. Since they make the source to most all of their library available, then it would seem odd to me that they would want to protect this code for some reason.
Steven Lord 2016 年 4 月 29 日
The conv2 function is built into MATLAB, and we do not distribute the source code for this function.
It sounds like you've isolated the differences to a single call to conv2 with the same data. If that is the case can you send information to reproduce this behavior to Technical Support for investigation (to determine if it is a bug) using the Contact Us link in the upper-right corner of this page? Some of the information you should include:
- Which releases of MATLAB are you using on the two machines? [If you're using different releases, try using the same release on both machines to eliminate the possibility that conv2 changed between the two releases.]
- What OS are you using on the two machines?
- Is the data you're passing as input to conv2 identical, down to the last bit (the isequal function returns true) on the two machines?
- Include a MAT-file containing the data you pass into conv2 and the exact command you use to call conv2.
Walter Roberson 2016 年 5 月 1 日
Rounding issues between OS are possible. The high performance libraries are compiled for each OS and chip. The Intel MKL (Math Kernel Library) is available for Linux but would not typically be installed on systems because it is not FOSS (Free Open Source Software), just Royalty Free. AMD machines need a different high performance library.
So to be really sure, you should save() the data just before the conv2 call and compare it.
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