Re: Inputing info into Nested Arrays

If you want to create a multidimensional array, you do it like this:

@array = ( [ "foo", "bar"],
           [ "abc", "def"] );
[download]

You can access elements with 2 array subscripts - $array[0][0] is "foo", $array[0][1] is "bar", $array[1][0] is "abc", etc.

Supposing that your file of projects had each project on 1 line, you could do this:

while ( <FILE> ) {
    push @array, [ split ];
}
[download]

Then to print it back out,

for $i (0..$#array) {
    for $j (0..$#{$array[$i]}) {
        print "Element $j of project $i is $array[$i][$j]\n";
    }
}
[download]

See The Perl Data Structures Cookbook for more info.

Comment on Re: Inputing info into Nested Arrays Select or Download Code

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RE: Re: Inputing info into Nested Arrays by She-wolf (Sexton) on Aug 21, 2000 at 20:45 UTC
The whole: `@array = ( [ "foo", "bar"], [ "abc", "def"] );` [download] thing seems to work just for small stuff, is there another way that will be a little easier for a large number of references? Also, I don't see how the `while ...` bit will work.(please excuse me, I'm a newbie) She-wolf "Wha? I don't get it."	[reply] [d/l] [select]
RE: RE: Re: Inputing info into Nested Arrays by Cirollo (Friar) on Aug 21, 2000 at 20:52 UTC
The `while`... bit splits each line up and puts the resulting array into an element of @array. `split` with no arguments takes a line from $_ and splits it on whitespace (e.g, /\s+/) after disregarding leading spaces. So, that creates the 'inner' array from each line (each word in the line is 1 element), and then the 'outer' array is created with each line as an element. So, `This is a test. This is line #2` [download] would be read in like this: `$array[0][0] = "This"; $array[0][1] = "is"; $array[0][2] = "a"; $array[0][3] = "test"; $array[1][0] = "This"; $array[1][1] = "is"; $array[1][2] = "line"; $array[1][3] = "#2";` [download] And of course, you are going to have to change this based on your data file's structure.	[reply] [d/l] [select]
RE: RE: RE: Re: Inputing info into Nested Arrays by She-wolf (Sexton) on Aug 21, 2000 at 20:56 UTC
So basically I'd have to have 11 columns and 100 rows? She-wolf "Wha? I don't get it."	[reply]
RE: RE: RE: RE: Re: Inputing info into Nested Arrays by merlyn (Sage) on Aug 21, 2000 at 20:58 UTC
RE: RE: RE: RE: RE: Re: Inputing info into Nested Arrays by She-wolf (Sexton) on Aug 21, 2000 at 21:06 UTC
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