Change the content in an m-file based on check-box input from gui

Hi,

I have a checkbox in my gui based on which i want to make some changes in another m-file & later run it.

The format of other m-file is like this:-

tclstart = {...
'# ...there is further code above.. #',...
'# .......................... #',...
'set compile            1',...
'# .......................... #',...
'# there is further code below'
}

Based on check-box value

get(h.checkbox1, 'Value');

if it is 1,i want set compile to be 1 in that m-file otherwise 0 as an m-file is similar to txt file,i'm doing this-

content = fileread('tcl.m'); % name of that other m-file
index = regexp(content,'set compile')

Here i'm getting starting index of the matched sub-string,now how can i change the value from 1 to 0/vice-versa.

Answer 1

[Walter Roberson]

newvalue = char('0' + get(h.checkbox1, 'Value'));
newcontent = regexprep(content, '(?<=set compile\s+)[01]', newvalue);

[Luffy]

Doesn't have any effect.And doesn't the above expression replace the entire set compile 1 with newvalue expression ?

[Walter Roberson]

The part in () is a lookaround assertion that is not considered part of the match

[Luffy]

Yeah,didn't see this ?<=. But anyway trying that above snippet doesn't change the value in the m file.

To do a quick test,i did this:

content = fileread('tcl.m'); % name of that other m-file
newvalue = '0';
newcontent = regexprep(content, '(?<=set compile\s+)[01]', newvalue);

but the value in the m file remains unchanged

[Walter Roberson]

The code snippet does not change the .m file: it returns the variable newcontent with the updated information. You can then write newcontent to whatever file.

fid = fopen('tcl.m', 'w');
fwrite(fid, newcontent);
fclose(fid);