How to check whether a column exist in a table?
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Alon Rozen
am 24 Nov. 2016
Kommentiert: Nikolaus Koopmann
am 2 Jul. 2024
Hi all,
I search for this question in the web and found the following solution: Suppose I have a table named 'My_Table' and want to check if it contains a column (field) named 'My_Column'. The code:
Exist_Column = strmatch('My_Column',My_Table.Properties.VariableNames)
should result in logical that answer the question. I checked it and it works. However, the Matlab editor commented that 'strmatch' is not a recommended function to use because it is about to be removed in future version and suggest instead the use of either 'strncmp' or 'validatestring'. Problem is that both do not return a logical and more steps are required to get the answer.
So, my question is: what is the simplest recommended way to determine if a certain column name exist in a table?
Thanks,
Alon
1 Kommentar
Carlos Aguilar
am 31 Dez. 2017
Just came across to this question. An anonymous function will also do the job (and will be reusable within the scope):
isTableCol = @(t, thisCol) ismember(thisCol, t.Properties.VariableNames);
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KSSV
am 24 Nov. 2016
Exist_Column = strcmp('My_Column',My_Table.Properties.VariableNames)
val = Exist_Column(Exist_Column==1) ;
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Nikolaus Koopmann
am 29 Nov. 2022
any("MyColumn" == string(My_Table.Properties.VariableNames))
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Sean Lynch
am 5 Sep. 2021
I used "any", but agree "ismember" is even better
exists = any(strcmp('Column-Name', My_Table.Properties.VariableNames))
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