String comparisions and counting

ruby-talk
1

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate[]) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

Pseudo code

if dataID occurs more than 5times
   print results
end

I hope this makes sense.

I would appreciate any help

Regards

···

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2

[1, 1, 2, 3, 4].count(1)

Todd

···

On Wed, Nov 5, 2008 at 7:35 AM, Stuart Clarke <stuart.clarke1986@gmail.com> wrote:

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

Pseudo code

if dataID occurs more than 5times
  print results
end

I hope this makes sense.

I would appreciate any help

Regards

3

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

Pseudo code

if dataID occurs more than 5times
  print results
end

I hope this makes sense.

I would appreciate any help

Regards
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Posted via http://www.ruby-forum.com/\.

···

On Wed, Nov 5, 2008 at 10:35 PM, Stuart Clarke <stuart.clarke1986@gmail.com> wrote:
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4

Stuart Clarke wrote:

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

  counts = Hash.new(0)
  @eventbydate.each { |e| counts[e] += 1 }
  if counts.find { |c| c >= 5 }
    puts "Print out some data"
  end

There are other variations:

  ...
  if counts.values.max >= 5
  ...

More efficient is to stop counting as soon as you reach 5, if you don't
need the final values:

  counts = Hash.new(0)
  if @eventbydate.find { |e| (counts[e] += 1) >= 5 }
    puts "Print out some data"
  end

···

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5

Is this helpful?

arr = ["a","b","a","c","a","a","c"]

h = Hash.new(0)
arr.each {|x| h += 1}
h.each {|x,y| p x if y > 3}

Harry

···

On Wed, Nov 5, 2008 at 10:35 PM, Stuart Clarke <stuart.clarke1986@gmail.com> wrote:

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

Pseudo code

if dataID occurs more than 5times
  print results
end

I hope this makes sense.

I would appreciate any help

Regards
--
Posted via http://www.ruby-forum.com/\.

--
A Look into Japanese Ruby List in English

6

Oops:

  if counts.find { |c| c >= 5 }

if counts.find { |k,v| c >= 5 }

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7

Pretty darn good. Why not use a database? I guess it comes down to
often you want to query the data.

Todd

···

On Wed, Nov 5, 2008 at 8:18 AM, Brian Candler <b.candler@pobox.com> wrote:

Stuart Clarke wrote:

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

counts = Hash.new(0)
@eventbydate.each { |e| counts[e] += 1 }
if counts.find { |c| c >= 5 }
   puts "Print out some data"
end

There are other variations:

...
if counts.values.max >= 5
...

More efficient is to stop counting as soon as you reach 5, if you don't
need the final values:

counts = Hash.new(0)
if @eventbydate.find { |e| (counts[e] += 1) >= 5 }
   puts "Print out some data"
end
--

8

Great stuff thanks. I went the last solution as I only want to pick up
any any high occurances.

Many thanks

Brian Candler wrote:

···

Stuart Clarke wrote:

I have an array full of strings which represent a date ID. The array
contains indivduals strings like the following:

TueAug052008

I want to iterate through this array (@eventbydate) and check each of
the values of the array. I then want a statement which says if any of
the date ID's in the array occurs more than 5 times print out some data.

  counts = Hash.new(0)
  @eventbydate.each { |e| counts[e] += 1 }
  if counts.find { |c| c >= 5 }
    puts "Print out some data"
  end

There are other variations:

  ...
  if counts.values.max >= 5
  ...

More efficient is to stop counting as soon as you reach 5, if you don't
need the final values:

  counts = Hash.new(0)
  if @eventbydate.find { |e| (counts[e] += 1) >= 5 }
    puts "Print out some data"
  end

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