Formatted string plus list of numbers using sprintf

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KAE 2019-6-18

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https://ww2.mathworks.cn/matlabcentral/answers/467757-formatted-string-plus-list-of-numbers-using-sprintf

评论： Adam Danz 2019-6-18

采纳的回答： Adam Danz

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I would like to display comma-separated records like the following,

Record1,2,8,3,5,2,6,3,7,7,7

Here's my attempt, but is there a less clunky way?

% Make the record label string
iRecord = 1;
strLabel = ['Record' num2str(iRecord)];
% Make the number vector
numberList = round(rand(1,10)*10);
% Turn number vector into a string
numberListIntoString = sprintf('%d,', numberList);
% Remove comma at end
numberListIntoString = numberListIntoString(1:(end-1)); 
% Display the result
disp([strLabel ',' numberListIntoString])

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Answer 1

Adam Danz 2019-6-18

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numberList = round(rand(1,10)*10);
s = ['Record',regexprep(num2str([1,numberList]),' +',',')];

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KAE 2019-6-18

编辑：KAE 2019-6-18

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I was unfamiliar with regexprep, so thanks. Just for my own learning on regular expressions, here we construct a string using

num2str([1,numberList]) % Space-separated list of numbers, with record number first

The spaces are replaced multiple times ('+') with commas.

Adam Danz 2019-6-18

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num2str([1,numberList])

That line adds more than 1 space between each number. The ' +' in the regular expression means search for at least one or more consecutive spaces.

Just for learning, remove that plus sign and see what happens,

numberList = round(rand(1,10)*10);
s = ['Record',regexprep(num2str([1,numberList]),' ',',')];
%                                                ^ only 1 space

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Answer 2

Steven Lord 2019-6-18

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编辑：Steven Lord 2019-6-18

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If you're using a release that supports string convert your numeric vector into a string using string. Next use join to combine the elements of that string array into one string, each separated by a delimeter. Finally concatenate the result to the end of a header string with +. I separated the steps into four lines for clarity, but you could do it in one.

vec = [1 2 8 3 5 2 6 3 7 7 7]
strvec = string(vec)
str = join(strvec, ',')
S = "Record " + str

I chose to separate "Record" and the first element of the the vector with a space; remove the last character of the string in the last line if you don't want that.