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Create a string array (MxN) where each element is a repeated character based off a numeric array (MxN)

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Carl
Carl on 25 Nov 2019
Commented: Carl on 25 Nov 2019
I want to create a string array (MxN) of a repeated character. Each element of the string array has the character repeated based on a number in a numeric array (MxN).
For example, if I had a numeric array as such:
A =
4 0
1 8
And I wanted to repeat the "#" character, I want to create a string array like this:
B =
2×2 string array
"####" ""
"#" "########"
The actual array I want to do this on is 7500x10 so other than a nested for-loop is there a more elegant way of getting my desired result?
Thanks
Carl

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Accepted Answer

Bhaskar R
Bhaskar R on 25 Nov 2019
B = string(cellfun(@(x)repelem('#', x), num2cell(A), 'UniformOutput', false));

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Bhaskar R
Bhaskar R on 25 Nov 2019
Hahaha, I think your version is less tha R2016b. Data type String is introduced in R2016b.
Anyway your answer is more suitable than mine, Carl asked for string matrix output, pass your answer to string thats it. :-)
B = string(arrayfun(@(x) repmat('#',1,x),A, 'UniformOutput', false))

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More Answers (1)

Philippe Lebel
Philippe Lebel on 25 Nov 2019
try this:
B = arrayfun(@(x) repmat('#',1,x),A, 'UniformOutput', false)
B =
'####' [1x0 char]
'#' '########'

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