Error in eigs when using Matlab 2017b?
显示 更早的评论
Hi,
When I'm using eigs(A,B,K) in Matlab 2017b and receiving the following error:
Error: File: eigs.m Line: 1442 Column: 5
"c" previously appeared to be used as a function or command, conflicting with its use here as the name of a variable.
A possible cause of this error is that you forgot to initialize the variable, or you have initialized it implicitly using load or eval.
The code works with Matlab 2016b. What could be the problem when using Matlab 2017b?
Best regards, Emil
8 个评论
Walter Roberson
2018-1-18
I do not get that error when I test.
I suggest you put in
dbstop if error
and run the code. When it stops, ask
which -all c
to find out where c is being found. Perhaps you have a c.m of your own that is somehow interfering.
the cyclist
2018-1-18
I agree with Walter that it is likely a function in file c.m, in the directory from which you are calling eigs. (I have found that just being in your path is ok, as long as it is not in your current working directory.)
Strangely, using "dbstop if error" (which is an excellent suggestion in general!) did not seem to help here. When I created a function file c.m in my current directory, and then called
eigs(rand(3),rand(3),2)
execution was not halted, and I was returned to the command line with the same error as Emil.
the cyclist
2018-1-18
编辑：the cyclist
2018-1-18
This is a bug, right? There should be no problem with having such a file.
I'm finding some version-dependent behavior here, too. I do not see this behavior in R2017b.
Emil Aggestam
2018-1-18
Christine Tobler
2018-1-18
In general, I'd say it's a good idea to not have one-letter function names. However, I don't see why this should stop EIGS from working here. I'll take a look, this indeed sounds like a bug.
Walter Roberson
2018-1-18
Possibly
dbstop if caught error
is needed to locate the problem.
the cyclist
2018-1-18
That didn't halt execution either (at least for me).
the cyclist
2018-1-19
编辑：the cyclist
2018-1-19
Addendum: I do see the bug in R2017b. I did the wrong test earlier.
采纳的回答
更多回答（1 个）
Christine Tobler
2018-1-24
1 个投票
Thank you for pointing out this bug. There is now a bug report available where this can be tracked, and it will be fixed in a future version.
To address a discussion in the comments, the reason that the debugger wasn't helping is that this error is coming from the initial parsing of eigs.m, before the function is entered (similar to what happens for an "if" without an "end": the whole file is seen as inconsistent).
类别
在 帮助中心 和 File Exchange 中查找有关 Programming Utilities 的更多信息
产品
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
