Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
This does most of the work for you, but I've left some things for you to do:

<DATA>; my @prev_line; while ( <DATA> ) { my @this_line = split /[,\s]+/; shift @this_line; print join( ", ", map { "$this_line[$_]-$prev_line[$_]" } 0 .. $#t +his_line ), "\n" if @prev_line; @prev_line = @this_line; } __DATA__ date, val1, val2, val3, val4 1/2/2007, 1, 4, 5, 6 1/3/2007, 2, 5, 7, 10 1/5/2007, 5, 6, 8, 11


2-1, 5-4, 7-5, 10-6 5-2, 6-5, 8-7, 11-10

You may find this version easier to follow (using the same __DATA__ as earlier):

<DATA>; my @prev_line; while ( <DATA> ) { my @this_line = split /[,\s]+/; shift @this_line; if ( @prev_line ) { my @output; for ( 0 .. $#this_line ) { push @output, "$this_line[$_]-$prev_line[$_]"; } print join( ", ", @output ), "\n"; } @prev_line = @this_line; }

That leaves you with the job and handling the files.

I'm sure google will help, and there's always the Perl documentation.

update: omitted __DATA__ first time round
update^2: added second example

In reply to Re^2: performing calculation in cells in a file by FunkyMonk
in thread RE: performing calculation in cells in a file by gsaray101

Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":

  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
Log In?

What's my password?
Create A New User
Domain Nodelet?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others chanting in the Monastery: (2)
As of 2022-07-07 11:16 GMT
Find Nodes?
    Voting Booth?

    No recent polls found