MATLAB Answers


Convert vector to cell array

Asked by Austin
on 18 Jun 2013

I am trying to use this

xDataNumbers = [2.5 5 7 8 11.5]

as the datanames for a fints

tsobj = fints(dates, data, datanames)

so - the question is: How do I convert a vector with numbers into a "Cell array of data series names" in the form nn.n?

Thanks. A


Jan Simon
on 18 Jun 2013

It is not clear what this exactly means:

"Cell array of data series names" in the form nn.n
on 18 Jun 2013

I have an array

xDataNumbers = [3.5 7 9.2 11.5 ...]

that I want to use as datanames for the third parameter in

tsobj = fints(dates, data, datanames)

The format should have max width of 5 with 1 decimal place (%5.1f I think). Another issue is that the datanames cant start with a number, so it's ok to prepend something like 'S: '

Oh, wait, can the dataname strings even contain any numbers??

Matt Kindig
on 18 Jun 2013

What is the desired output for datanames?

1 Answer

Answer by Kye Taylor
on 18 Jun 2013
 Accepted answer

The third input to the fints function is a cell array of strings that can be valid MATLAB identifiers. That is, the strings cannot start with numbers and can only contain letters, numbers, and the underscore. As a workaround, you could do this

% convert numeric array to cell, and convert all contents to strings
dataNamesInput = cellfun(@num2str,num2cell(xDataNumbers(:)),'uniformoutput',false);
% make sure first letter is not numeric (it will be 'x')
dataNamesInput = cellfun(@(s)['x',s],dataNamesInput,'uniformoutput',false);
% remove periods and replace with underscores
dataNamesInput = regexprep(dataNamesInput,'\.','_');

and use dataNamesInput as the third input. Someone may suggest using the genvarnames function, but it will replace periods with '0x2'. You may prefer that. In any case, you'll still need the first line of code above that converts numeric array to cell of strings.

  1 Comment

Jan Simon
on 19 Jun 2013


dataNamesInput = cellfun(@(s)['x',s],dataNamesInput, 'uniformoutput',false);
dataNamesInput = regexprep(dataNamesInput,'\.','_');

can be done faster by:

dataNamesInput = strcat('x', dataNamesInput);
dataNamesInput = strrep('.', '_');

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