Fortran How can I read only the real data from a txt file in Fortran 90?

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The discussion centers on reading a text file in Fortran 90, specifically how to ignore the first two lines of header comments and extract only the real data. The initial query highlights an issue with using the read command, which results in input-variable type errors when attempting to read the data directly. A solution is provided, suggesting that the first two lines can be read into a character variable to bypass their contents. After reading these lines, a loop can be implemented to read the actual data. The user confirms that the problem has been resolved, expressing gratitude for the assistance received.
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hi dears
I have a txt file as follows:
"
x1 Xi x2 x-EN y-EN EA EB ma gnetic
------------------------------------------------------&------------
.0010 -.9990 .7322 .4042 -.3280 -.0002 -.3279 .0010
.0010 -.9990 .7322 .4042 -.3280 -.0002 -.3279 .0010
.0010 -.9800 .7210 .3917 -.3293 -.0030 -.3262 .0010
.0010 -.9700 .7153 .3855 -.3297 -.0045 -.3252 .0010
.0010 -.9600 .7096 .3796 -.3300 -.0060 -.3241 .0010
.0010 -.9500 .7041 .3739 -.3302 -.0074 -.3228 .0010
.0010 -.9400 .6987 .3684 -.3302 -.0089 -.3214 .0010
.0010 -.9300 .6933 .3632 -.3301 -.0103 -.3199 .0010
.0010 -.9200 .6880 .3581 -.3299 -.0117 -.3183 .0010
.0010 -.9100 .6829 .3533 -.3296 -.0130 -.3166 .0010
"
i want to read this data in fortran 90 but i need only the real data. So I don't know how i can read them in such a way that the first two line is ignored. using /-format the .exe file can'nt read the real data and an error related to input-variable type is appeared.
how you can help me.
thanks
 
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Needless to say, whenever you are reading a file, you need to know ahead of time its precise format...otherwise, how would you know what to read where?

So, if you know that your file starts with 2 or 3 comment lines, all you need to do is read those line into a character variable (string) long enough to read the entire line, say, 80 characters long. After you are done reading those 2 heading lines explicitly, then you can move on to some kind of loop where you can read your data.
 


gsal said:
So, if you know that your file starts with 2 or 3 comment lines, all you need to do is read those line into a character variable (string) long enough to read the entire line, say, 80 characters long.

You don't need to read the lines into a variable, unless you want to print them out as a check you are reading the right file, or whatever.
Code: 
read(1,*)
will read a line and ignore its contents.
 
msabet said:
hi dears
I have a txt file as follows:
"
x1 Xi x2 x-EN y-EN EA EB ma gnetic
------------------------------------------------------&------------
.0010 -.9990 .7322 .4042 -.3280 -.0002 -.3279 .0010
.0010 -.9990 .7322 .4042 -.3280 -.0002 -.3279 .0010
.0010 -.9800 .7210 .3917 -.3293 -.0030 -.3262 .0010
.0010 -.9700 .7153 .3855 -.3297 -.0045 -.3252 .0010
.0010 -.9600 .7096 .3796 -.3300 -.0060 -.3241 .0010
.0010 -.9500 .7041 .3739 -.3302 -.0074 -.3228 .0010
.0010 -.9400 .6987 .3684 -.3302 -.0089 -.3214 .0010
.0010 -.9300 .6933 .3632 -.3301 -.0103 -.3199 .0010
.0010 -.9200 .6880 .3581 -.3299 -.0117 -.3183 .0010
.0010 -.9100 .6829 .3533 -.3296 -.0130 -.3166 .0010
"
i want to read this data in fortran 90 but i need only the real data. So I don't know how i can read them in such a way that the first two line is ignored. using /-format the .exe file can'nt read the real data and an error related to input-variable type is appeared.
how you can help me.
thanks
ok. can you give me a sample, e.g. in the above data?please
 
msabet said:
ok. can you give me a sample, e.g. in the above data?please

It's been solved. with gratitude
thanks
 

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