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From: samik bhattacharya on 13 Jul 2010 12:33
Hi all,
I have a data file in the following format:
Step = 1 z = 0.0000 U_pitot= 8.030 U = 7.168

To read this, I used the following line of codes:
fp=fopen('c:\Samik\test\data.txt','r');
p=fscanf(fp,'Step =%f\t');
q=fscanf(fp,'z =%f\t');
r=fscanf(fp,'U_pitot=%f\t');
s=fscanf(fp,'U=%f');
fclose(fp);

But problem is, fscanf is reading only upto U_pitot, but not U. So in the workspace i am getting variavles like
ans= 0
fp=3
p=1
q=0
r=8.0300
U=[]
Now I can not figure out why this is happenning. I will be glad to get some help on this
Regards
Samik
From: dpb on 13 Jul 2010 12:58
samik bhattacharya wrote:
> Hi all,
> I have a data file in the following format:
> Step = 1 z = 0.0000 U_pitot= 8.030 U = 7.168
> To read this, I used the following line of codes:
> fp=fopen('c:\Samik\test\data.txt','r');
> p=fscanf(fp,'Step =%f\t');
> q=fscanf(fp,'z =%f\t');
> r=fscanf(fp,'U_pitot=%f\t');
> s=fscanf(fp,'U=%f');
> fclose(fp);
>
> But problem is, fscanf is reading only upto U_pitot, but not U. So in
> the workspace i am getting variavles like
> ans= 0
> fp=3
> p=1
> q=0
> r=8.0300
> U=[]
> Now I can not figure out why this is happenning. I will be glad to get
> some help on this

One would guess there's something in the data file that doesn't quite
match what you think.

I'd do something like

fp=fopen('c:\Samik\test\data.txt','rt'); % Note the 't' for safety
s = fgetl(fp); % get the full line
t = findstr(s,'\t'); % see where tabs really are
n = lenght(t); % and how many
fp = fclose(fp);

Now do the results of the above look as you expect?

You might also consider

doc textscan

--
From: samik bhattacharya on 13 Jul 2010 13:18
dpb <none(a)non.net> wrote in message <i1i644$6ua$1(a)news.eternal-september.org>...
> samik bhattacharya wrote:
> > Hi all,
> > I have a data file in the following format:
> > Step = 1 z = 0.0000 U_pitot= 8.030 U = 7.168
> > To read this, I used the following line of codes:
> > fp=fopen('c:\Samik\test\data.txt','r');
> > p=fscanf(fp,'Step =%f\t');
> > q=fscanf(fp,'z =%f\t');
> > r=fscanf(fp,'U_pitot=%f\t');
> > s=fscanf(fp,'U=%f');
> > fclose(fp);
> >
> > But problem is, fscanf is reading only upto U_pitot, but not U. So in
> > the workspace i am getting variavles like
> > ans= 0
> > fp=3
> > p=1
> > q=0
> > r=8.0300
> > U=[]
> > Now I can not figure out why this is happenning. I will be glad to get
> > some help on this
>
> One would guess there's something in the data file that doesn't quite
> match what you think.
>
> I'd do something like
>
> fp=fopen('c:\Samik\test\data.txt','rt'); % Note the 't' for safety
> s = fgetl(fp); % get the full line
> t = findstr(s,'\t'); % see where tabs really are
> n = lenght(t); % and how many
> fp = fclose(fp);
>
> Now do the results of the above look as you expect?
>
> You might also consider
>
> doc textscan
>
> --Hi,
Thanks for your reply. After I ran your code, i got t=[], n=0; So it means number of tabs=0.I deleted all the tabs from my code. But now it is not reading anything atall
Samik
From: dpb on 13 Jul 2010 15:18
samik bhattacharya wrote:
> dpb <none(a)non.net> wrote in message
> <i1i644$6ua$1(a)news.eternal-september.org>...
>> samik bhattacharya wrote:
>> > Hi all,
>> > I have a data file in the following format:
>> > Step = 1 z = 0.0000 U_pitot= 8.030 U = 7.168
>> > To read this, I used the following line of codes:
....
>> > > But problem is, fscanf is reading only upto U_pitot, but not U. So
....
>> > Now I can not figure out why this is happenning. I will be glad to
>> get > some help on this
>>
>> One would guess there's something in the data file that doesn't quite
>> match what you think.
>>
>> I'd do something like
>>
>> fp=fopen('c:\Samik\test\data.txt','rt'); % Note the 't' for safety
>> s = fgetl(fp); % get the full line
>> t = findstr(s,'\t'); % see where tabs really are
>> n = lenght(t); % and how many
>> fp = fclose(fp);
>>
>> Now do the results of the above look as you expect?
>>
>> You might also consider
>>
>> doc textscan
>>
>> --Hi,
> Thanks for your reply. After I ran your code, i got t=[], n=0; So it
> means number of tabs=0.I deleted all the tabs from my code. But now it
> is not reading anything atall

Sorry if this is a duplicate--

OK, now we know it isn't a tab-delimited file format.

I'd still recommend looking at textscan() for this but...

I missed this, too, first go but--look _very_ carefully at the format
string and the data line at the location where the first go-round failed
and see if you see the problem therein.

--
From: samik bhattacharya on 13 Jul 2010 15:53
dpb <none(a)non.net> wrote in message <i1ieag$f37$1(a)news.eternal-september.org>...
> samik bhattacharya wrote:
> > dpb <none(a)non.net> wrote in message
> > <i1i644$6ua$1(a)news.eternal-september.org>...
> >> samik bhattacharya wrote:
> >> > Hi all,
> >> > I have a data file in the following format:
> >> > Step = 1 z = 0.0000 U_pitot= 8.030 U = 7.168
> >> > To read this, I used the following line of codes:
> ...
> >> > > But problem is, fscanf is reading only upto U_pitot, but not U. So
> ...
> >> > Now I can not figure out why this is happenning. I will be glad to
> >> get > some help on this
> >>
> >> One would guess there's something in the data file that doesn't quite
> >> match what you think.
> >>
> >> I'd do something like
> >>
> >> fp=fopen('c:\Samik\test\data.txt','rt'); % Note the 't' for safety
> >> s = fgetl(fp); % get the full line
> >> t = findstr(s,'\t'); % see where tabs really are
> >> n = lenght(t); % and how many
> >> fp = fclose(fp);
> >>
> >> Now do the results of the above look as you expect?
> >>
> >> You might also consider
> >>
> >> doc textscan
> >>
> >> --Hi,
> > Thanks for your reply. After I ran your code, i got t=[], n=0; So it
> > means number of tabs=0.I deleted all the tabs from my code. But now it
> > is not reading anything atall
>
> Sorry if this is a duplicate--
>
> OK, now we know it isn't a tab-delimited file format.
>
> I'd still recommend looking at textscan() for this but...
>
> I missed this, too, first go but--look _very_ carefully at the format
> string and the data line at the location where the first go-round failed
> and see if you see the problem therein.
>
> --hi,
I did not quite get your procedure. To use textscan I need to know the exact format. But I tried to use
c=textscan(fp,'%s %f\t %s %f\t %s %f\t %s %f');
OR
c=textscan(fp,'%s %f %s %f %s %f %s %f ');
none worked
anyway, thanks again for your effort
samik
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