如何确定在MATLAB中打印数字的位置? [英] How to determine where a number is printing from in MATLAB?
问题描述
在MATLAB中，如何判断变量在代码中的哪个位置输出?
In MATLAB, how do you tell where in the code a variable is getting output?
我大约有1万行MATLAB代码，大约有4个人在工作.在某处，有人以典型方式将变量转储到MATLAB脚本中:
I have about 10K lines of MATLAB code with about 4 people working on it. Somewhere, someone has dumped a variable in a MATLAB script in the typical way:
foo
不幸的是，我不知道正在输出什么变量.输出使其他更重要的输出杂乱无章.
Unfortunately, I do not know what variable is getting output. And the output is cluttering out other more important outputs.
有什么想法吗?
p.s.有人尝试覆盖Standard.out吗?由于MATLAB和Java的集成如此紧密，这样行得通吗?遇到此问题时，我在Java中使用的一个技巧是用自己的版本替换Standard.out.
p.s. Anyone ever try overwriting Standard.out? Since MATLAB and Java integration is so tight, would that work? A trick I've used in Java when faced with this problem is to replace Standard.out with my own version.
推荐答案
哦，我也讨厌这个.我希望Matlab可以使用"dbstop if display"来停止此操作.
Ooh, I hate this too. I wish Matlab had a "dbstop if display" to stop on exactly this.
从微音遍历mlint是个好主意.但是，Mlint无法看到动态代码，例如eval()的参数或字符串值图形处理回调.我已经在这样的回调中运行了这样的输出，其中update_table()在某些情况下会返回一些内容.
The mlint traversal from weiyin is a good idea. Mlint can't see dynamic code, though, such as arguments to eval() or string-valued figure handle callbacks. I've run in to output like this in callbacks like this, where update_table() returns something in some conditions.
uicontrol('Style','pushbutton', 'Callback','update_table')
您可以插入"内置类型的方法，以为您提供dbstop的挂钩.在Matlab路径上的目录中，创建一个名为"@double"的新目录，并创建一个@ double/display.m文件，如下所示.
You can "duck-punch" a method in to built-in types to give you a hook for dbstop. In a directory on your Matlab path, create a new directory named "@double", and make a @double/display.m file like this.
function display(varargin)
builtin('display', varargin{:});
那你就可以做
dbstop in double/display at 2
并运行您的代码.现在，只要省略的分号(包括来自动态代码)隐式调用显示，您就将进入调试器.为@double这样做似乎也涵盖了char和单元格.如果显示的是其他类型，则可能需要尝试.
and run your code. Now you'll be dropped in to the debugger whenever display is implicitly called by the omitted semicolon, including from dynamic code. Doing it for @double seems to cover char and cells as well. If it's a different type being displayed, you may have to experiment.
您可能会以相同的方式覆盖内置的disp().我认为这类似于Java的System.out流的自定义替代.
You could probably override the built-in disp() the same way. I think this would be analagous to a custom replacement for Java's System.out stream.
不用说，向内置类型添加方法是非标准的，不受支持的，非常容易出错的，并且要非常警惕调试会话之外的情况.
Needless to say, adding methods to built-in types is nonstandard, unsupported, very error-prone, and something to be very wary of outside a debugging session.
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