How TABLE retreive the variable names?

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0 个投票

This example from the doc shows table is able to retrieve the variable names of the iput arguments list and uses them as column name:

LastName = {'Sanchez';'Johnson';'Li';'Diaz';'Brown'};
Age = [38;43;38;40;49];

Then

T = table(LastName,Age)

I get

T =
5×2 table
    LastName     Age
    _________    ___
    'Sanchez'    38 
    'Johnson'    43 
    'Li'         38 
    'Diaz'       40 
    'Brown'      49

For

T = table(LastName,Age+1)

I get

T =
    5×2 table
      LastName     Var2
      _________    ____
      'Sanchez'     39 
      'Johnson'     44 
      'Li'          39 
      'Diaz'        41 
      'Brown'

My question is simple: how can do the same (retrieve the variable names) within my own function?

If yes, same question for output arguments:

bar = foo(123);

can foo retrieves 'bar'?

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Answer 1

Stephen23 2018-11-6

1 个投票

https://www.mathworks.com/help/matlab/ref/inputname.html

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Peter Perkins 2018-11-15

inputname can be, and has been, way over-used. A little goes a long way. In particular, it is a really bad idea to get the names of your inputs and then overwrite them using evalin.

You may not have wanted to do that. But don't do that.

Bruno Luong 2018-11-15

Never use it myself (thus the question), but I can see some circumstances I would want to use it:

Put some more meaningful error message or log message
Check if the input argument is from an expression of a variable, in the MEX file I might not bother to perform inplace change in the first case to save some memory or duplication.

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