Why does removing the "sealed" attribute break the class

2016 3 4
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更新时间：2016 3 9
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If I remove the "Sealed" attribute of the table class to try to subclass it, the class is then listed as unsealed in matlab, and I can create a class from it, but I get the following error when calling the table or the subclass constructor:
Method 'display' is not defined for class 'table' or is removed from MATLAB's search path.

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per isakson
per isakson 2016-3-6
编辑：per isakson 2016-3-6
Did you edit file
... datatypes\@table\table.m
in the Matlab installation? Or did you make a copy?
Brian Miller
Brian Miller 2016-3-8
I actually tried both. I editted that file, and when that didn't work, I made a copy and put it in my current folder, assuming that would supercede the original, and it seems to, but then I get the message that the display method isn't defined.

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Steven Lord
Steven Lord 2016-3-8

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We don't support subclassing the table class -- that's why it's Sealed. Perhaps if you describe what you want to do by subclassing table, we can offer suggestions for a way to achieve that goal without subclassing. Alternately, if there's functionality you believe table is missing that should be added, contact Technical Support and request that your request for this functionality be added to the enhancement request database.

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Brian Miller
Brian Miller 2016-3-9
I wanted to create a variable that looks like a table in the edittor, and can hold the same types of data in each cell, but I wanted to also be able to add a couple of methods to it. I wanted to create a log of model runs, and be able to look at results, as well as run some comparisons or view profiler results, for example. If I am not allowed to subclass it, is there a way to create it from scratch?

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