Why do I see an error when adding character data to a table?

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MathWorks Support Team
回答： MathWorks Support Team 2018-6-20
I have a table like the following:
x=[1;2;3];
y=[4;5;6];
T=table(x,y)
Then I add a column of placeholder values:
z=zeros(3,1);
T=horzcat(T,table(z))
Now want to fill in the table with data from a serial port:
for i=1:3
T{i,'z'} = query(device,'command') % or: T(i,'z') = query(device,'command')
end
I get one of the following errors:
The value being assigned from must have 1 columns.
or
The number of table variables in an assignment must match.
How can I put this data in the table?

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采纳的回答

MathWorks Support Team
You are seeing these errors because the value returned from the query function is a 1xN character vector, but the data in that spot of the table is a 1x1 double. The data in a column must all have the same type and size.
Instead, make this a column of strings. You can still create placeholder values and fill them in one by one.
z=strings(3,1);
T=horzcat(T,table(z))
for i=1:3
T{i,'z'} = string(query(device,'command'))
end

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