When fprintf, I need a return (\r\n) after each line (with inconstant number of values per line)

• I'm doing a loop to print many lines of data in a file, and I want a return after each line. I am ok with constant number of values per line. But when the number of values per line is not constant, the format of data in the file is not correct.

E.g. use following code to print 3 values (1st line) then 4 values (2nd line) per line

if true
 fprintf(File,'%s,%i,%i\r\n',DataArray{:})
end

It shows

a,1,4

b,5,8,

9

What I want is:

a,1,4

b,5,8,9

I know the problem is because I set the number of value to be 3 in the code (%s,%i,%i), so Matlab deem each line has 3 values. But how can I get the format that I need??

[Tom]

Will the data always have one string, then some number of integers? e.g. '%s %i %i' or '%s %i %i %i' and so on?

[yang]

No Tom..the first one is string, the next few are intergers, then with unknown number of strings. i.e.

'%s %i %i %i %s'

or '%s %i %i %i %s %s'

or '%s %i %i %i %s %s %s'

and so on.

Answer 1

[Tom]

Data = {'alpha', 1 , 2 , 3, 'beta' , 'gamma' , 'delta' , 4};

% find locations strings and numeric data:
str = cellfun(@ischar,Data);
num = cellfun(@isnumeric,Data);
t = num2str(str + (num*2)); %number 1 equates to string, 2 equates to numeric

formatStr = [regexprep(t,{'1','2'} , {'%s', '%i'}) ,'\r\n'];

fprintf(File,formatStr)

[yang]

Thanks Tom! This will help!

Answer 2

[Image Analyst]

How about

if length(DataArray) == 3
  fprintf(File,'%s,%i,%i\r\n',DataArray{:})
else
  fprintf(File,'%s,%i,%i %i\r\n',DataArray{:})
end

[yang]

Thanks. But the number of values per line could be any integer, not only 3 or 4....Any other idea?

[Image Analyst]

In the future, it helps to put in those kind of details/requirements in the original question. Otherwise, how would we know?