if i have an array full of numbers such as
['234234','04593','4098234','0','0','0']
how do i remove the 0 elements without affecting the 0's in the 04593
and the 4098234 numbers?
my original thoughts were to use a array.reject approach but it didnt
quite work out 
Thanks
-Jon
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Jon Hawkins wrote:
how do i remove the 0 elements without affecting the 0's in the 04593
and the 4098234 numbers?
array.delete('0')
best,
Dan
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why didn't reject work?
array = ['234234','04593','4098234','0','0','0']
=> ["234234", "04593", "4098234", "0", "0", "0"]
array.reject {|e| e == '0' }
=> ["234234", "04593", "4098234"]
(sorry if this posts twice)
On Aug 3, 4:42 pm, Jon Hawkins <globyy3...@hotmail.com> wrote:
if i have an array full of numbers such as
['234234','04593','4098234','0','0','0']how do i remove the 0 elements without affecting the 0's in the 04593
and the 4098234 numbers?my original thoughts were to use a array.reject approach but it didnt
quite work outThanks
-Jon
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Chris wrote:
why didn't reject work?
array = ['234234','04593','4098234','0','0','0']
=> ["234234", "04593", "4098234", "0", "0", "0"]
array.reject {|e| e == '0' }
=> ["234234", "04593", "4098234"]
well lemme further explain what im attempting to do and why i couldnt
get reject to work right, i need to delete all the 0's in the array then
add up those non-zero numbers.
with:
array.inject(0) {|num, i| num + i}/array.length/1024 #1024 =
kilobytes convert
so if theres a way to shove reject into that then lemme know ^^
Thanks
-Jon
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Just a small remark: you do not have numbers in your array but
strings. I assume you want to using numeric addition and not string
concatenation. In that case I'd do:
irb(main):001:0> array = ['234234','04593','4098234','0','0','0']
=> ["234234", "04593", "4098234", "0", "0", "0"]
irb(main):002:0> nums = array.inject() {|a,n| a << n.to_i unless n == "0"; a}
=> [234234, 4593, 4098234]
irb(main):003:0> avg = nums.inject(0) {|s,n| s+n}.to_f / nums.size / 1024
=> 1411.8037109375
Alternative if you prefer a single pass:
irb(main):018:0> sum,count = array.inject([0,0]) {|(s,c),n| n == "0" ?
[s,c] : [s+n.to_i,c+1]}
=> [4337061, 3]
irb(main):019:0> avg = sum.to_f / count / 1024
=> 1411.8037109375
Kind regards
robert
2007/8/4, Jon Hawkins <globyy3000@hotmail.com>:
Chris wrote:
> why didn't reject work?
>
>>> array = ['234234','04593','4098234','0','0','0']
> => ["234234", "04593", "4098234", "0", "0", "0"]
>>> array.reject {|e| e == '0' }
> => ["234234", "04593", "4098234"]well lemme further explain what im attempting to do and why i couldnt
get reject to work right, i need to delete all the 0's in the array then
add up those non-zero numbers.
with:array.inject(0) {|num, i| num + i}/array.length/1024 #1024 =
kilobytes convertso if theres a way to shove reject into that then lemme know ^^
Jon Hawkins wrote:
Chris wrote:
why didn't reject work?
array = ['234234','04593','4098234','0','0','0']
=> ["234234", "04593", "4098234", "0", "0", "0"]
array.reject {|e| e == '0' }
=> ["234234", "04593", "4098234"]
well lemme further explain what im attempting to do and why i couldnt
get reject to work right, i need to delete all the 0's in the array then
add up those non-zero numbers.
with:array.inject(0) {|num, i| num + i}/array.length/1024 #1024 =
kilobytes convertso if theres a way to shove reject into that then lemme know ^^
Thanks
-Jon
Why do you want to remove the 0 elements for that? They won't influence
the result:
avg_kb = array.inject(0.0) { |sum,num| sum + num.to_f
}/array.length/1024
If you don't want the average without zero-size files write
array.delete('0')
in the line before, as Daniel Lucraft already pointed out.
Regards
Stefan
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but rejecting the 0 elements will change the length of the array,
and change the resulting average. It depends on whether you want to
generate
the average across all values or the average across all non-zero
values.
with_zeroes = [ 0, 0, 0, 1.0 ]
without_zeroes = with_zeroes.reject { |x| x == 0 } #=> [ 1.0 ]
with_zeroes.inject { |a,b| a + b } / with_zeroes.length #=> 0.25
without_zeroes.inject { |a,b| a + b } / without_zeroes.length #=> 1.0
On Aug 6, 11:08 am, Stefan Rusterholz <apei...@gmx.net> wrote:
Why do you want to remove the 0 elements for that? They won't influence
the result:
avg_kb = array.inject(0.0) { |sum,num| sum + num.to_f}/array.length/1024
Noah Easterly wrote:
but rejecting the 0 elements will change the length of the array,
and change the resulting average. It depends on whether you want to
generate
If you don't want the average without zero-size files write
array.delete('0')
in the line before, as Daniel Lucraft already pointed out.
It helps to read the whole mail ;-p
Regards
Stefan
From my previous post:
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