sort and compare

kumarboston

Hi All,
I am trying to sort a column based on the numerical value but it seems to me that perl sorts based on first value of the column. For example, some of the data in my file is 23, 5467, 21, 64, 654, 342, 10
When i used the sort function on the array of these numbers, it sorted based on first numerical number and not based on total value. Like it sorted 10, 21, 23,342,5467, 64,654 but i am trying to get based on value like 5467,654,342,64,23,21,10.

Any help will be appreciated.
Thanks
Kumar

Oct 12 '08 #1

numberwhun

So, you wanted sorted in two ways, first, but the length of the number, and then a sub-sort to put them in order of each length, largest to smallest (reverse sort).

What code have you tried thus far? You need to show us what you have done before we can help you.

BTW, please put your code in code tags. An example is shown in the "Reply Guidelines" box to the right of the reply window.

Regards,

Jeff

Oct 12 '08 #2

KevinADC

to sort numerically you have to use the numeric comparison operator <=>:

otherwise perl sorts the numbers as ASCII strings, which is the default sort. Its covered in the sort functions documentation.

To reverse the order transpose $a and $b.

Oct 12 '08 #3

kumarboston

Thanks for your reply,
here is my code
Thanks
kumar

Oct 13 '08 #4

kumarboston

and here is my sample data
Thanks
Kumar

Oct 13 '08 #5

KevinADC

Thanks for your reply,
here is my code

Expand|Select|Wrap|Line Numbers

1. my %hash;
2. open (FH, "cluster4.info");
3. while(<FH>)
4. {
5.     my $line = $_;
6.     chomp $line;
7.     if ($line=~/^#/)
8.         {next;}
9.     $line=~/.*\s(\d+).*=\s+(\d+)/;
10.     my $cnum = $1;my $mem = $2;
11.     $hash{$cnum} = $mem;
12. }
13.  
14.     foreach $value (sort {$hash{$b} cmp $hash{$a} }
15.            keys %hash)
16. {
17.     print "$value $hash{$value}\n";
18. }
19.  

Thanks
kumar

Is there a question you have about your code?

Oct 13 '08 #6

kumarboston

Hi All,
Thanks for your help, I solved the problem of sorting and printing, only a small issue, while printing the data I want to put a new line(only once) when the value is less than 100 but when i am using the if condition its printing in the all the values which i don't want. Any help. I am posting my code, sample data and result output.
Thanks
Kumar

Oct 13 '08 #7

Icecrack

Hi All,
Thanks for your help, I solved the problem of sorting and printing, only a small issue, while printing the data I want to put a new line(only once) when the value is less than 100 but when i am using the if condition its printing in the all the values which i don't want. Any help. I am posting my code, sample data and result output.

Thanks
Kumar

can you restate that i don't understand what your getting at.

Oct 13 '08 #8

KevinADC

I'm confused. The data you posted does not seem to be the data your script is working with.

The data is not:

cluster t.nn has nn

where 'nn' is some integer

Oct 13 '08 #9

kumarboston

Sorry for the confusion,
actually what I am trying to do is, when the result is printed then, if the number of elements(last column values) are less than 100 then put a new line between the result.
so the result should look something like this:
but with my code, its putting new line in every line after the number of elements are less than 100, so my results looks like this
I know that i am printing the new line in the loop but i tried different combinations but neither worked.

Again sorry for the confusion.

Thanks
Kumar

Oct 13 '08 #10

Icecrack

try this if this is what you are asking for?

Oct 13 '08 #11

nithinpes

If you want to insert an extra newline only once before the values displayed are less than 100, use this approach.

Oct 13 '08 #12

Icecrack

Ok i think i got what you mean now,

you want the first line that is below or equal to 100 to print a new line before it and thats it.

try:

Oct 13 '08 #13