Array and Selection

Shell Programming and Scripting
1

I have a question:

                                                    Y    X

Tabel a is a array multidimensional --> a(1024,20)

I load in to array a Text from 6000 row where:
in a(1,1) is present the row 1 of original text, in a(1024,1) is present then row 1024 of original test and in a(1024,2) is present the row 2048 of original text , in a(1,3) is present the row 2049 the ooriginal text ecc....

fig.

     1                       2                               3                      4 \(X array\)

  1

 ..         >  \( Y array\)

 ..

...

  1024                 1024                              1024                 1024

I find a procedure / function to point a cell(x,y) where in input are the l row of original text loaded.

es function Position (row Y, column x)

      --  solve \--

POSFOUND=xxxxxx in the original text.

and
function PosArray ( roworiginal x )
Rowxres and Columres return the array position

tanks

2

Remember !!!!

I use Posix shell (ksh)

tanks

3

I'm not sure I follow you. But here is an attempt at what I think you may want:

#! /usr/bin/ksh

nline=0
while read line ; do
        ((element=nline%1000))
        ((narray=nline/1000))
        eval array${narray}[$element]=\$line
        ((nline=nline+1))
done < bigfile
((count=narray*1000+element))




while echo enter x,y \\c  ; read  x y ; do
        echo x = $x
        echo y = $y

        ((lineno=(y-1)*1024+x))
        echo lineno = $lineno
        ((element=(lineno-1)%1000))
        ((narray=(lineno-1)/1000))
        echo element = $element
        echo narray = $narray
        eval value=\"\${array${narray}[$element]}\"
        echo value = $value
done
echo
exit 0

The first paragraph just reads a file into a very large array. Ideally, I would use a 6000 element array. But ksh does not guarantee that arrays that large will work. So I use a collection of arrays, each with 1000 elements. To access element 1234, I use real element 234 of array 1. Then I have a loop that reads coordinates and calculates the line number coresponding to those coordinates. Then I convert the line number to array/element and grab the value. To test it, I created a bigfile with:
yes | awk '{print NR,$0}' | sed 6000q > bigfile

4

how you declare a collection of array ???

why in you procedure not use the sintax Array[x,y] but eval array${narray}[$element]=\$line ???

very taks

5

You just start using an array, no need to "declare" it. ksh does not have multi-dimensioned arrays. It only has one dimensional arrays. So I had to improvise.