Changing the name of the variables in table

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Shelender Kumar 2018-11-2

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评论： Peter Perkins 2018-11-6

Let us say I have an output file (called combined) which is an array so To write to a file, first I convert it into the table but now I do not know how to change the name of the variables

T = array2table(combined);

Now the variables names are combined1, combined2 and so on but I want to give it my own names like 150K, 140K etc. Could you help me with this

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Shelender Kumar 2018-11-3

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I did use

a=table(1,2,3,'VariableNames',{'k146','k147','k148'}

and it worked

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Answer 1

Caglar 2018-11-2

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编辑：Caglar 2018-11-2

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You can do that on initialization,

a=table(1,2,3,'VariableNames',{'One','Two','Final'})

or after creation,

a.Properties.VariableNames={'Five','Six','Seven'}

Note that, sadly, Matlab does not let you define variable names before you put at least one row of data.

    b=table('VariableNames',{'Test'})
    Error using table (line 307)
    The VariableNames property must contain one name for each variable in the table.

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Caglar 2018-11-2

You can use it like _146k or k146. If you really need to keep the original variable name, you can save them in descriptions of the table.

a.Properties.VariableDescriptions={'146k','145k'}

They wont show up on variable but you can load them back whenever you need again.

Peter Perkins 2018-11-6

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Shelender, array2table allows you to provide var names if you don't want the defaults. See the doc.

Caglar, the reason why

table('VariableNames',{'Test'})

errors is because you are providing a name but no variable. You can't name something that isn't there, and there's a difference between "has no rows" and "isn't there at all". If you want a table with no rows, one variable, and a specific name, do something like this

table(zeros(0,1),'VariableNames',{'Test'})

or in recent versions (R2018a and later, IIRC), this

table('Size',[0,1],'VariableTypes',{'double'}, ,'VariableNames',{'Test'})

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Answer 2

awezmm 2018-11-2

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编辑：awezmm 2018-11-2

I think you can do something like: T.Properties.VariableNames = {'newname1' 'newname2'}

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Shelender Kumar 2018-11-2

Thanks but I am getting an error '146k' is not a valid variable name.

awezmm 2018-11-2

The issue is that you cant start variable names with numbers. You can have to some sort of string at the beginning. Maybe you can do 'Resolution_146k' or give some other title so it describes it well

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