Use Readtable() on a single-column CSV but generated multiple variable names

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Zzz 2021-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/857825-use-readtable-on-a-single-column-csv-but-generated-multiple-variable-names

评论： Asvin Kumar 2021-6-23

When using readtable() to read a single-column CSV file, the function reads more than one variable name.

% Read CSV data
dataset = readtable(CSVpath, "TextType","string", "ReadVariableNames", true)
vNames = dataset.Properties.VariableNames
% Expected
vNames = 1x1 cell array {'Notes'}
% Received
vNames = 1x7 cell array {'Call_1__'}    {'US___'}    {'Var3'}    {'Var4'}    {'Var5'}    {'Var6'}    {'Var7'}

There were 2 warnings: one telling me to use 'preserve' to preserve variable names; the other says that my variable names are too long (truncated to the max length).

Warning: Column headers from the file were modified to make them valid MATLAB identifiers before creating variable names for the table. The
original column headers are saved in the VariableDescriptions property.
Set 'VariableNamingRule' to 'preserve' to use the original column headers as table variable names. 

How can I only read the one column I want?

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dpb 2021-6-16

Attach the file; we can't tell what's in it to confuse readtable without seeing it.

If it's really, really long, just save and attach the first 50 rows or something representative.

Asvin Kumar 2021-6-23

Like dpb says, it's hard to suggest fixes without seeing the actual data. Here's a suggestion. You can mention the range of your variable names by creating custom file import options. You can set the VariableNamesRange property of a SpreadsheetImportOptions object.

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