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arraysmatlabconcatenation
Pep
Pep

Reputation: 147

Matlab - Concatenate integer values with chars in a vector

I have a vector with certain numbers as:

A=[1 2 3];

And I need to get another vector as:

B=[G1 G2 G3];

Since I cannot mix chars and doubles, I tried to convert the matrix A into a cell array doing:

num2cell(num2str(A))

And then do:

strcat(A, 'G')

To obtain the desired result. But doing the num2cell I obtain cell values for thee white spaces (so instead of obteniendo a cell array of 3x1, I obtain Nx1), and then the concatenation with the letter 'G' becomes wrong.

Upvotes: 0

Views: 365

Answers (2)

Reed Espinosa
Reed Espinosa

Reputation: 413

If you want B to be a single string with all these values you can simply use sprintf. This function accepts vectors as it's second argument so it's very easy to add the same character to every value in A.

B = sprintf('G%d ', A);

Note that this will leave you with a trailing space after your last entry (i.e. 'G1 G2 G3 ') but this can easily be removed though with:

B(end) = [];

See the documentation on sprintf for more examples.

Upvotes: 0

Suever
Suever

Reputation: 65460

The issue is that num2cell makes every single character a separate cell array element by default.

num2cell(num2str(A))
%    '1'    ' '    ' '    '2'    ' '    ' '    '3'

To simply concatenate G to every element, you can just use numstr on the column-vector version of A which places each string representation of each number in A on a new line. strcat would then prepend a 'G' to each line. If you want it as a cell array, we can wrap that in a cellstr call to get a cell array.

output = cellstr(strcat('G', num2str(A(:))))

Alternately, you could just use sprintf on each element in A

output = arrayfun(@(x)sprintf('G%d', x), A, 'UniformOutput', false)

Upvotes: 2

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