fprintf printing long strings
in [Matlab]
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From: CyberFrog on 20 Jun 2010 18:56 Hi all, I have a simple fprintf code as follows: fido = fopen(myfile, 'a'); fprintf(fido,['Name: ',mystring,'\n']); where mystring is: 'dogs' and this seems t print ok. However if mystring is longer i.e. I have tried to use a pathname instead, mystring='C:/all/this/way/to/get/home/sweet/home' I get a warning: Warning: Invalid escape sequence appears in format string. See help sprintf for valid escape sequences. Does anyone know what this means?
From: dpb on 20 Jun 2010 19:31 CyberFrog wrote: > Hi all, > > I have a simple fprintf code as follows: > > fido = fopen(myfile, 'a'); > fprintf(fido,['Name: ',mystring,'\n']); > > where mystring is: 'dogs' and this seems t print ok. However if > mystring is longer i.e. I have tried to use a pathname instead, > > mystring='C:/all/this/way/to/get/home/sweet/home' > > I get a warning: > > Warning: Invalid escape sequence appears in format string. See help > sprintf for valid escape sequences. > Does anyone know what this means? Yeah, you tried to put in the \n character w/o a formatting string-- Try fprintf(fido,'%s\n',['Name: ',mystring]); instead... --
From: us on 20 Jun 2010 20:16 "CyberFrog" <domlee55(a)hotmail.com> wrote in message <hvm6a5$70k$1(a)fred.mathworks.com>... > Hi all, > > I have a simple fprintf code as follows: > > fido = fopen(myfile, 'a'); > fprintf(fido,['Name: ',mystring,'\n']); > > where mystring is: 'dogs' and this seems t print ok. However if mystring is longer i.e. I have tried to use a pathname instead, > > mystring='C:/all/this/way/to/get/home/sweet/home' > > I get a warning: > > Warning: Invalid escape sequence appears in format string. See help > sprintf for valid escape sequences. > > Does anyone know what this means? very strange... as thist works flawlessly and as expected... s='C:/all/this/way/to/get/home/sweet/home'; sprintf(['Name: ',s,'\n']) % ans = Name: C:/all/this/way/to/get/home/sweet/home us
From: dpb on 20 Jun 2010 21:08 us wrote: > "CyberFrog" <domlee55(a)hotmail.com> wrote in message > <hvm6a5$70k$1(a)fred.mathworks.com>... >> Hi all, >> >> I have a simple fprintf code as follows: >> >> fido = fopen(myfile, 'a'); >> fprintf(fido,['Name: ',mystring,'\n']); >> >> where mystring is: 'dogs' and this seems t print ok. However if >> mystring is longer i.e. I have tried to use a pathname instead, >> >> mystring='C:/all/this/way/to/get/home/sweet/home' >> >> I get a warning: >> >> Warning: Invalid escape sequence appears in format string. See help >> sprintf for valid escape sequences. >> Does anyone know what this means? > > very strange... > as thist works flawlessly and as expected... > > s='C:/all/this/way/to/get/home/sweet/home'; > sprintf(['Name: ',s,'\n']) > % ans = Name: C:/all/this/way/to/get/home/sweet/home > W/ old R12 the \n w/o a format specification complains that a variable n is undefined... I don't know nuthink' (a la Sgt Schultzie :) ) hardly about the C formatting so had never thought of not needing a format specification but I guess I can see since "ordinary" text is just passed thru that it might oughta' should work... -- --
From: Doug Schwarz on 21 Jun 2010 12:18
CyberFrog wrote: > Hi all, > > I have a simple fprintf code as follows: > > fido = fopen(myfile, 'a'); > fprintf(fido,['Name: ',mystring,'\n']); > > where mystring is: 'dogs' and this seems t print ok. However if > mystring is longer i.e. I have tried to use a pathname instead, > > mystring='C:/all/this/way/to/get/home/sweet/home' > > I get a warning: > > Warning: Invalid escape sequence appears in format string. See help > sprintf for valid escape sequences. > Does anyone know what this means? If you really used forward slashes then this should be fine, but if you actually used backslashes (like are normally used on Windows) then you have constructed a format string containing things like '\w' and that is an invalid escape sequence. Obviously, your example is not what you really used so I can't be more specific. The problem is not the length of mystring. The way to avoid the problem is fprintf(fido,'Name: %s\n',mystring); -- Doug Schwarz dmschwarz&ieee,org Make obvious changes to get real email address. |