MATLAB Answers


How to Print a Numerical Vector to a List?

Asked by Gonçalo Pimenta on 14 Sep 2018
Latest activity Edited by dpb
on 16 Sep 2018
Accepted Answer by dpb
I have an array with multiple vectors each with thousands of numbers and I want to print each of these vectors to a list of strings, each with a specific format and with a maximum of 8 numbers per list.
For example:
I have a vector temp = [1 2 3 4 5 6 7 8 9 10 11 12 13]
I want to print this vector to two strings like this
str1 = '+,1,2,3,4,5,6,7,8,'
str2 = '+,9,10,11,12,13,'
It would be useful to save each string to a separate entry on an array because later these strings will be printed to a .txt file.
I have tried to do this but I always have trouble with the last line that may not have the desired 8 elements..
Does anyone know a clean way to do this?
Here are some printscreens to try to clarify:
The red rectangle is my reference ID
The green rectangle is the matrix with the numbers I want to print
The blue column is the vector of numbers I want to print (This is inside the previous green rectangle)
And finally, this is how the printed file will look like
Can anyone help me?
Thank you very much!


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1 Answer

Answer by dpb
on 15 Sep 2018
Edited by dpb
on 16 Sep 2018
 Accepted Answer

fmt=[' +,' repmat('%d,',1,8)]; % format w/ extra blank each line for delimiter later
str=split(sprintf(fmt,vec),' '); % write to string, break into substrings at delimiter
str(1)=[]; % eliminate first empty record/string
>> str
str =
2×1 cell array
{'+,9,10,11,12,13,' }
Put delimiter at end of record instead--
fmt=['+,' repmat('%d,',1,8) ' '];
>> split(sprintf(fmt,tmp),' ')
ans =
2×1 cell array
{'+,9,10,11,12,13,' }


It's perfect dpb!
Thank you very much!
on 16 Sep 2018
Actually, can be made "even more perfect"!
fmt=['+,' repmat('%d,',1,8) ' '];
to place the delimiter at the end of each record and won't get the empty first record and thus can eliminate the need to strip it from the result...

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