Open a non empty file, go to a specific row and column and edit(overwrite)

1 view (last 30 days)
Hello, I want to open a file (from command line), say 'cylds.bc', then navigate to a specific line and edit that line. These are the contents of the file:
# BC_SLIPW
PATCH 1 1
NAME SolidWall
#
say i wanted to go to second line and change the number 1 1 to 2 1 . How can I do that?

Answers (1)

Andrew
Andrew on 14 Jul 2014
you could do something with textscan and strncmp
for instance:
fid = fopen('cylds.bc','r+'); %open file for reading and writing
data=textscan(fid,'%s') %read file as string
data=data{1}; %for some reason maybe someone can explain you need to do this to get to the data
data(strncmp('PATCH',data,1)) = sprintf('%5s %5i %i','PATCH',2,1);
fprintf(fid,'%s',data); %write the data to the file
fclose(fid); %close file
Please note that I have not tested this so there may be a typo

Categories

Find more on Data Import and Export in Help Center and File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!