[R] how to used regular expression while reading file
i have file as in txt format
@ATTRIBUTE f1996 REAL
@ATTRIBUTE f1997 REAL
@ATTRIBUTE f1998 REAL
@ATTRIBUTE f1999 REAL
@ATTRIBUTE f2000 REAL
@ATTRIBUTE class {-1,1}
@DATA
2.080750,1.099070,0.927763,1.029080,-0.130763,1.265460,-0.43
1.109460,0.786453,0.445560,-0.146323,-0.996316,0.555759,0.29
-0.676530,1.693100,1.559250,1.559980,-0.982179,-1.358510,-1.
0.534396,1.677540,1.489030,0.778605,-0.183776,-1.116850,-1.4
-1.018900,0.511080,0.755641,1.013820,0.529899,0.160440,-0.08
-1.185370,-0.514473,-0.566634,1.224720,0.619244,-0.684713,-0
1.779050,0.423947,0.820696,2.525690,0.666921,0.661346,0.4253
--
i want to parse only numbers not starting with @
like
2.080750,1.099070,0.927763,1.029080,-0.130763,1.265460,-0.43
1.109460,0.786453,0.445560,-0.146323,-0.996316,0.555759,0.29
-0.676530,1.693100,1.559250,1.559980,-0.982179,-1.358510,-1.
0.534396,1.677540,1.489030,0.778605,-0.183776,-1.116850,-1.4
-1.018900,0.511080,0.755641,1.013820,0.529899,0.160440,-0.08
-1.185370,-0.514473,-0.566634,1.224720,0.619244,-0.684713,-0
1.779050,0.423947,0.820696,2.525690,0.666921,0.661346,0.4253
putting numbers only in array for each line
how should i assess (read) file
--
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Re: [R] how to used regular expression while reading file
You could perhaps set the comment.char argument of read.table() to @.
More generally, you can use scan() and process the lines within R.
On Tue, Mar 6, 2012 at 8:41 AM, sagarnikam123 sagarnikam...@gmail.com wrote:
i have file as in txt format
@ATTRIBUTE f1996 REAL
@ATTRIBUTE f1997 REAL
@ATTRIBUTE f1998 REAL
@ATTRIBUTE f1999 REAL
@ATTRIBUTE f2000 REAL
@ATTRIBUTE class {-1,1}
@DATA
2.080750,1.099070,0.927763,1.029080,-0.130763,1.265460,-0.43
1.109460,0.786453,0.445560,-0.146323,-0.996316,0.555759,0.29
-0.676530,1.693100,1.559250,1.559980,-0.982179,-1.358510,-1.
0.534396,1.677540,1.489030,0.778605,-0.183776,-1.116850,-1.4
-1.018900,0.511080,0.755641,1.013820,0.529899,0.160440,-0.08
-1.185370,-0.514473,-0.566634,1.224720,0.619244,-0.684713,-0
1.779050,0.423947,0.820696,2.525690,0.666921,0.661346,0.4253
--
i want to parse only numbers not starting with @
like
2.080750,1.099070,0.927763,1.029080,-0.130763,1.265460,-0.43
1.109460,0.786453,0.445560,-0.146323,-0.996316,0.555759,0.29
-0.676530,1.693100,1.559250,1.559980,-0.982179,-1.358510,-1.
0.534396,1.677540,1.489030,0.778605,-0.183776,-1.116850,-1.4
-1.018900,0.511080,0.755641,1.013820,0.529899,0.160440,-0.08
-1.185370,-0.514473,-0.566634,1.224720,0.619244,-0.684713,-0
1.779050,0.423947,0.820696,2.525690,0.666921,0.661346,0.4253
putting numbers only in array for each line
how should i assess (read) file
--
Sarah Goslee
http://www.functionaldiversity.org
__
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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Re: [R] How '.' is used?
At 17:06 09/08/2009, Peng Yu wrote: Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? It has a special meaning in a formula. ?formula tells you more Regards, Peng Michael Dewey http://www.aghmed.fsnet.co.uk __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] How '.' is used?
Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? Regards, Peng __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How '.' is used?
On 09-Aug-09 16:06:52, Peng Yu wrote: Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? Regards, Peng To the best of my knowledge, apart from its specific use as a separator between the integer and fractional parts of a number, . has no specific use in R, and you can, for instance, use it just as you would use an alphanumeric character in a name. For instance, you could do . - 1.2345 . # [1] 1.2345 . - function(x) x^2 .(12) # [1] 144 So, unless there is something I don't know about, there is hardly anything to discuss about the detailed usage of '.' in R! Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 09-Aug-09 Time: 17:32:54 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How '.' is used?
On Sun, Aug 9, 2009 at 11:32 AM, Ted Hardingted.hard...@manchester.ac.uk wrote: On 09-Aug-09 16:06:52, Peng Yu wrote: Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? Regards, Peng To the best of my knowledge, apart from its specific use as a separator between the integer and fractional parts of a number, . has no specific use in R, and you can, for instance, use it just as you would use an alphanumeric character in a name. For instance, you could do . - 1.2345 . # [1] 1.2345 . - function(x) x^2 .(12) # [1] 144 So, unless there is something I don't know about, there is hardly anything to discuss about the detailed usage of '.' in R! The ',' character is one of the characters allowed in names, hence it can be used as you have suggested. There are (at least) two special usages of the '.' in names. Following the time-honoured Unix convention, names that begin with '.' are considered hidden names and not listed by ls() or objects() unless you set all.names = TRUE in the call. Because of this convention it is inadvisable to use names starting with '.' except when you wish to avoid potential name conflicts. The second special use of '.' in a name is in the construction of the names of S3 method functions. The method for generic function foo applied to class bar is named foo.bar. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How '.' is used?
On 09-Aug-09 16:53:32, Douglas Bates wrote: On Sun, Aug 9, 2009 at 11:32 AM, Ted Hardingted.hard...@manchester.ac.uk wrote: On 09-Aug-09 16:06:52, Peng Yu wrote: Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? Regards, Peng To the best of my knowledge, apart from its specific use as a separator between the integer and fractional parts of a number, . has no specific use in R, and you can, for instance, use it just as you would use an alphanumeric character in a name. For instance, you could do _. - 1.2345 _. _# [1] 1.2345 _. - function(x) x^2 _.(12) _# [1] 144 So, unless there is something I don't know about, there is hardly anything to discuss about the detailed usage of '.' in R! The ',' character is one of the characters allowed in names, hence it can be used as you have suggested. There are (at least) two special usages of the '.' in names. Following the time-honoured Unix convention, names that begin with '.' are considered hidden names and not listed by ls() or objects() unless you set all.names = TRUE in the call. Because of this convention it is inadvisable to use names starting with '.' except when you wish to avoid potential name conflicts. The second special use of '.' in a name is in the construction of the names of S3 method functions. The method for generic function foo applied to class bar is named foo.bar. As in summary.glm, I suppose! However, this prompts a question. In the first place, the construction of summary.glm from summary and glm is, in the first instance, simply using . in its basic role as a permissible character in a name. Correct? Next -- and this is the real question -- how does R parse the name summary.glm? In my naivety, I simply suppose that it looks for an available function whose name is summary.glm in just the same way as it looks for stopifnot, or for that matter data.matrix which is not (as far as I know) a compound of a generic function data applied to a class matrix. Then . would not have a special (parseable) role in the name -- it is simply another letter. But when you do have such a function, like summary.glm, does R in fact parse it as summary then glm (i.e. look out for the generic function summary and then specialise it to handle glm). As I say, I suppose not. And, if not, then the special use of the character . is simply a programmer's convention for the construction of the name, and once the name exists the . does not have a special (parseable) significance for R. Just seeking clarification ... ! Thanks, Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 09-Aug-09 Time: 19:58:32 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How '.' is used?
(Ted Harding) wrote: On 09-Aug-09 16:53:32, Douglas Bates wrote: On Sun, Aug 9, 2009 at 11:32 AM, Ted Hardingted.hard...@manchester.ac.uk wrote: On 09-Aug-09 16:06:52, Peng Yu wrote: Hi, I know '.' is not a separator in R as in C++. I am wondering where it discusses the detailed usage of '.' in R. Can somebody point me a webpage, a manual or a book that discuss this? Regards, Peng To the best of my knowledge, apart from its specific use as a separator between the integer and fractional parts of a number, . has no specific use in R, and you can, for instance, use it just as you would use an alphanumeric character in a name. For instance, you could do _. - 1.2345 _. _# [1] 1.2345 _. - function(x) x^2 _.(12) _# [1] 144 So, unless there is something I don't know about, there is hardly anything to discuss about the detailed usage of '.' in R! The ',' character is one of the characters allowed in names, hence it can be used as you have suggested. There are (at least) two special usages of the '.' in names. Following the time-honoured Unix convention, names that begin with '.' are considered hidden names and not listed by ls() or objects() unless you set all.names = TRUE in the call. Because of this convention it is inadvisable to use names starting with '.' except when you wish to avoid potential name conflicts. The second special use of '.' in a name is in the construction of the names of S3 method functions. The method for generic function foo applied to class bar is named foo.bar. As in summary.glm, I suppose! However, this prompts a question. In the first place, the construction of summary.glm from summary and glm is, in the first instance, simply using . in its basic role as a permissible character in a name. Correct? Correct. Next -- and this is the real question -- how does R parse the name summary.glm? In my naivety, I simply suppose that it looks for an available function whose name is summary.glm in just the same way as it looks for stopifnot, or for that matter data.matrix which is not (as far as I know) a compound of a generic function data applied to a class matrix. Then . would not have a special (parseable) role in the name -- it is simply another letter. It doesn't do anything special when parsing. The special sauce comes when the generic summary() function executes UseMethod(summary). At that point, we know the class of the object, and we know the name of the generic, so it goes looking for a summary.glm method. There are some subtleties to how it does that lookup (see the discussion in Writing R Extensions about NAMESPACES), but if you had a generic function calling UseMethod(data) and it was passed an object of class matrix, data.matrix() would be called, even though that doesn't make sense. This is a flaw in the S3 system, and one of the motivations for the development of the S4 system. Duncan Murdoch But when you do have such a function, like summary.glm, does R in fact parse it as summary then glm (i.e. look out for the generic function summary and then specialise it to handle glm). As I say, I suppose not. And, if not, then the special use of the character . is simply a programmer's convention for the construction of the name, and once the name exists the . does not have a special (parseable) significance for R. Just seeking clarification ... ! Thanks, Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 09-Aug-09 Time: 19:58:32 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] How '.' is used?
On 09-Aug-09 19:31:47, Duncan Murdoch wrote: (Ted Harding) wrote: [...] Next -- and this is the real question -- how does R parse the name summary.glm? In my naivety, I simply suppose that it looks for an available function whose name is summary.glm in just the same way as it looks for stopifnot, or for that matter data.matrix which is not (as far as I know) a compound of a generic function data applied to a class matrix. Then . would not have a special (parseable) role in the name -- it is simply another letter. It doesn't do anything special when parsing. The special sauce comes when the generic summary() function executes UseMethod(summary). At that point, we know the class of the object, and we know the name of the generic, so it goes looking for a summary.glm method. There are some subtleties to how it does that lookup (see the discussion in Writing R Extensions about NAMESPACES), but if you had a generic function calling UseMethod(data) and it was passed an object of class matrix, data.matrix() would be called, even though that doesn't make sense. This is a flaw in the S3 system, and one of the motivations for the development of the S4 system. Many thanks, Duncan. I think that makes it clear! You've prompted me to read ?UseMethod': When a function calling 'UseMethod(fun)' is applied to an object with class attribute 'c(first, second)', the system searches for a function called 'fun.first' and, if it finds it, applies it to the object. If no such function is found a function called 'fun.second' is tried. If no class name produces a suitable function, the function 'fun.default' is used, if it exists, or an error results. which is pretty explicit that the role of the . is simply to construct a name for the system to look for. One learns ... Thanks. Ted. E-Mail: (Ted Harding) ted.hard...@manchester.ac.uk Fax-to-email: +44 (0)870 094 0861 Date: 09-Aug-09 Time: 21:22:23 -- XFMail -- __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
