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Anyone help me with the format of fprintf

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QIAO WANG
QIAO WANG on 30 Apr 2019
Commented: Star Strider on 1 May 2019
Hi,
I'm stuck with fprintf when I want to obtain this type of line in my text file.
With the code below, I'm able to get a line in my text file 31 -1 1 -1 30 -1 3 -1 7 -1 11 -1 16 -1 17 -1 21 -1 -2 -1 However, I don't want the last -1 in my output line. I want the output like this 31 -1 1 -1 30 -1 3 -1 7 -1 11 -1 16 -1 17 -1 21 -1 -2 What I have got is quite close to my final one but I really don't know how to modify my current code to achieve my final version.
str = [num2str(79), '.txt'];
fileID = fopen(str,'w');
temparray = [31 1 30 3 7 11 16 17 21];
formatSpec = '%d -1 ';
fprintf(fileID,formatSpec,temparray,-2);
Hope someone could help me out. Thank you in advance.

Accepted Answer

Star Strider
Star Strider on 30 Apr 2019
The easiest solution is likely to modify your first fprintf statement, and add a second fprintf to print the final ‘-2’:
fprintf(fileID,formatSpec,temparray);
fprintf(fileID,' -2')

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