Format problem

ruby-talk
1

Hi all,

I have a 1D array containing 96 elements. I change it
into a 2D array then print it out: each line/row is an
element with whatever columns I want. The problem is
that if the column number is < 10 I can print out
the format that I want. If the column number is >=10 I
still can print the results but the format is changed.
Also I use object#inspect method to check the data
structure: both of them are an 2D array. If the 1D
array is defined as _1D_array=1..96 then change it to
a 2D array no such problem happens. Any comments?

Thanks,

Li

#script

_1D_array.each_slice(s) do |i|
  _2D.array<<I
end

pp _2D.arry

## if column is 8
[[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5, 603.0],

[11900.4, 10823.3, 10090.5, 3271.5, 4560.7, 3617.6,
1815.7, 855.3, 915.4],
[583.3, 601.1, 565.6, 459.2, 349.3, 358.0, 351.1,
340.2, 488.2],
[13.0, 14.1, 14.1, 16.2, 16.1, 27.1]]

##if column is 12

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],

[459.2,
  349.3,
  358.0,
  351.1,
  340.2,
  488.2,
  13.0,
  14.1,
  14.1,
  16.2,
  16.1,
  27.1]]

···

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2

chen li wrote:

Hi all,

I have a 1D array containing 96 elements. I change it
into a 2D array then print it out: each line/row is an
element with whatever columns I want. The problem is
that if the column number is < 10 I can print out
the format that I want. If the column number is >=10 I
still can print the results but the format is changed.
Also I use object#inspect method to check the data
structure: both of them are an 2D array. If the 1D
array is defined as _1D_array=1..96 then change it to
a 2D array no such problem happens. Any comments?

Just one. What are the data, and what result do you want?

Show examples of the data that originate in your one dimensional, 96 element
array, and show the desired output formatting.

Here is an example of what you might want, but this can only be a guess
under the circumstances:

···

-------------------------------------

#!/usr/bin/ruby -w

array =

1.upto(96) { array << rand(256) }

max_cols = 10

col = 0

array.each do |item|
  printf("%4d",item)
  puts if (col += 1) % max_cols == 0
end

puts

-------------------------------------

Example output:

  88 227 250 145 115 255 93 4 91 5
138 120 26 89 148 225 29 95 71 232
  99 166 99 250 23 2 205 147 176 221
228 33 156 97 74 241 7 252 236 85
120 150 46 227 175 23 250 186 151 154
   9 245 239 164 242 6 89 180 86 239
  27 141 161 251 38 7 190 195 9 106
127 220 112 18 86 247 82 82 122 101
109 250 70 189 224 181 87 116 238 58
124 118 99 18 188 53

--
Paul Lutus
http://www.arachnoid.com

3

original 1D array
[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5, 603.0,..., 11900.4, 10823.3, 10090.5,
3271.5, 4560.7, 3617.6,1815.7, 855.3, 915.4,583.3,
601.1, 565.6, 459.2, 349.3, 358.0, 351.1,340.2,
488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

I change 1D array into 2D array:
2D array in 8 columns x 12 rows or
2D array in 12 columns x8 rows.

If column number is <10 I get expected output
format(each line is a row containing 8 columns):
[[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5],

...
[340.2, 488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

]

If column number is >=10 let say 12, I get unwanted
output(each line is a column):

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],
?
[459.2,
  349.3,
  358.0,
  351.1,
  340.2,
  488.2,
  13.0,
  14.1,
  14.1,
  16.2,
  16.1,
  27.1]]

Li

···

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4

chen li wrote:

original 1D array

/ ... snip result listing

Li

It would be very helpful is you were to post the code you used to get this
result.

Again, I am just guessing about what you want, but try this:

···

--------------------------------------

#!/usr/bin/ruby -w

array =
1.upto(96) { array << rand(2000) }

rows = 8
columns = 12

slices =

0.upto(rows-1) do |i|
slices << array[i * columns,columns]
end

p slices

--------------------------------------

--
Paul Lutus
http://www.arachnoid.com

5

require 'pp'

PP.pp arr, 100 # you'll have to fudge this number

···

On Dec 10, 2006, at 02:12 , chen li wrote:

original 1D array
[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5, 603.0,..., 11900.4, 10823.3, 10090.5,
3271.5, 4560.7, 3617.6,1815.7, 855.3, 915.4,583.3,
601.1, 565.6, 459.2, 349.3, 358.0, 351.1,340.2,
488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

I change 1D array into 2D array:
2D array in 8 columns x 12 rows or
2D array in 12 columns x8 rows.

If column number is <10 I get expected output
format(each line is a row containing 8 columns):
[[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5],

...
[340.2, 488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

]

If column number is >=10 let say 12, I get unwanted
output(each line is a column):

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],

--
Eric Hodel - drbrain@segment7.net - http://blog.segment7.net

I LIT YOUR GEM ON FIRE!

6

Paul Lutus wrote:

It would be very helpful is you were to post the code you used to get
this
result.

My script is about 140 lines. I am not sure if I post it.

Li

···

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7

Hi --

···

On Mon, 11 Dec 2006, Eric Hodel wrote:

On Dec 10, 2006, at 02:12 , chen li wrote:

original 1D array
[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5, 603.0,..., 11900.4, 10823.3, 10090.5,
3271.5, 4560.7, 3617.6,1815.7, 855.3, 915.4,583.3,
601.1, 565.6, 459.2, 349.3, 358.0, 351.1,340.2,
488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

I change 1D array into 2D array:
2D array in 8 columns x 12 rows or
2D array in 12 columns x8 rows.

If column number is <10 I get expected output
format(each line is a row containing 8 columns):
[[2294.4, 3481.2, 2716.7, 1672.2, 1135.3, 2103.5,
591.1, 648.5],

...
[340.2, 488.2,13.0, 14.1, 14.1, 16.2, 16.1, 27.1]

]

If column number is >=10 let say 12, I get unwanted
output(each line is a column):

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],

require 'pp'

PP.pp arr, 100 # you'll have to fudge this number

I think you have to give it a middle argument (an output handle) so as
to keep the args lined up:

   PP.pp(arr, $>, 100)

David

--
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A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black\)
    aka The Ruby book for Rails developers!
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)

8

Li Chen wrote:

Paul Lutus wrote:

It would be very helpful is you were to post the code you used to get
this
result.

My script is about 140 lines. I am not sure if I post it.

Did my previously posted code example solve your problem? If you will be
specific enough about the problem and its roots in your Ruby code, we might
be able to resolve the issue without examining all your source.

You should be able to create an abbreviated version of your program that
simply creates and displays the problem array. That would allow an easy
analysis and fix.

···

--
Paul Lutus
http://www.arachnoid.com

9

Paul Lutus wrote:

Did my previously posted code example solve your problem? If you will be
specific enough about the problem and its roots in your Ruby code, we
might
be able to resolve the issue without examining all your source.

I need sometime to think about your codes. Although my codes have
problem on printing the expected format it can correctly import the data
into Excel.

Thanks,

Li

···

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10

Paul Lutus wrote:

You should be able to create an abbreviated version of your program that
simply creates and displays the problem array. That would allow an easy
analysis and fix.

Hi Paul,

I run your codes and it works fine.

And here is my codes with the problem:

···

###
require 'pp'
require 'enumerator'

      file_name='C:\Ruby\self\exp\BMDC5-3H\EXPT.083'

       #read the data file
      data =
      _1D_array=

      f=File.open(file_name)
      f.each do |line|
              next if line=~/CPM/
               # get the 3th column for each line
                _1D_array<<line.chomp.split()[2].to_f
       end

      # transform the 1D array into 2D array
       columns=12
     _1D_array.each_slice(columns) do|slice|
              data<<slice
     end

     pp data

###output
[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],
...
[459.2,
  349.3,
  358.0,
  351.1,
  340.2,
  488.2,
  13.0,
  14.1,
  14.1,
  16.2,
  16.1,
  27.1]]

Exit code: 0

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

11

Li Chen wrote:

Paul Lutus wrote:

You should be able to create an abbreviated version of your program that
simply creates and displays the problem array. That would allow an easy
analysis and fix.

Hi Paul,

I run your codes and it works fine.

Does it produce a result that is different than your own code, when used
with 'pp'? Does it solve your problem?

And here is my codes with the problem:

What is the problem at this point? What is 'pp'? How do you export your data
to Excel? What happens if you adopt my method instead of your own?

···

--
Paul Lutus
http://www.arachnoid.com

12

Paul Lutus wrote:

Does it produce a result that is different than your own code, when used
with 'pp'? Does it solve your problem?

And here is my codes with the problem:

What is the problem at this point? What is 'pp'? How do you export your
data
to Excel? What happens if you adopt my method instead of your own?

Hi Paul,

When I run your script I need to use pp(pretty print) to get 8 rows x12
columns format on the screen. If I just use p I get all the elements on
one line. But I still can see the result is a 2D array even they are
printed one line. For me I need the format in result A only.

Here is your codes with pp(8 row x12 column format):

###format A##

ruby format4.rb

[[1256, 1165, 95, 330, 1320, 1425, 1489, 1953, 207, 1132, 1378, 1101],
[530, 1340, 1842, 1136, 104, 888, 378, 741, 954, 1949, 1608, 597],
[1379, 648, 95, 544, 1194, 1728, 1259, 691, 601, 20, 1301, 1625],
[652, 32, 947, 241, 248, 656, 1197, 1308, 1870, 613, 1188, 1409],
[680, 1294, 1842, 1947, 1467, 670, 989, 126, 1174, 964, 1868, 1875],
[771, 990, 687, 706, 1372, 0, 1332, 1527, 411, 1885, 658, 1903],
[207, 276, 71, 1097, 10, 1083, 1600, 1776, 1016, 374, 414, 472],
[1477, 1183, 711, 1726, 1642, 1167, 1513, 316, 28, 1285, 181, 1681]]

Exit code: 0

##format B##
your code with p:(all elements in one line, 1 row x 96 column format)

ruby format4.rb

[[631, 1224, 1534, 477, 642, 1915, 814, 1350, 998, 234, 1377, 1697],
[1421, 1972, 1020, 789, 1258, 1585, 1979, 518, 1747, 1419, 169, 1067],
[1395, 1103, 463, 1064, 1841, 1676, 1946, 1697, 1274, 153, 1125, 1415],
[1857, 1322, 782, 778, 1704, 100, 1814, 1144, 1380, 1155, 626, 520],
[137, 788, 1691, 1865, 1443, 20, 1699, 1595, 51, 1481, 1603, 558], [240,
92, 927, 635, 1910, 1806, 778, 170, 1152, 281, 1434, 1422], [1011, 143,
1315, 78, 1076, 828, 496, 559, 1878, 1660, 1613, 1721], [1344, 1716,
103, 760, 389, 1869, 716, 945, 637, 596, 1550, 752]]

Exit code: 0

If I run your codes with my data and if I use p I get the same format as
that in result B.

If I run your codes with my data and if I use pp I get the format C as
follows:

##result C

ruby format3.rb

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],
...
[459.2,
  349.3,
  358.0,
  351.1,
  340.2,
  488.2,
  13.0,
  14.1,
  14.1,
  16.2,
  16.1,
  27.1]]

Exit code: 0

Whatever codes I run the same 2D array gives rise to different print
format and the formats also depend on the data in the 2D array. This is
the reason why I post my question.

Again thank you very much for your time,

Li

···

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

13

Hi --

···

On Mon, 11 Dec 2006, Paul Lutus wrote:

What is 'pp'?

The pretty-printing library in the standard Ruby distribution. See
pp.rb.

David

--
Q. What's a good holiday present for the serious Rails developer?
A. RUBY FOR RAILS by David A. Black (http://www.manning.com/black\)
    aka The Ruby book for Rails developers!
Q. Where can I get Ruby/Rails on-site training, consulting, coaching?
A. Ruby Power and Light, LLC (http://www.rubypal.com)

14

Li Chen wrote:

Paul Lutus wrote:

Does it produce a result that is different than your own code, when used
with 'pp'? Does it solve your problem?

And here is my codes with the problem:

What is the problem at this point? What is 'pp'? How do you export your
data
to Excel? What happens if you adopt my method instead of your own?

Hi Paul,

When I run your script I need to use pp(pretty print) to get 8 rows x12
columns format on the screen.

No, you /do/ /not/ need to do that. The formatter 'pp' is /optional/, it is
not mandatory. You do no have to use it, if it doesn't give you what you
want. Does it give you what you want? If not, stop using it.

Because you have tried to use 'pp' to get what you want, and because you are
posting again, I am guessing that 'pp' is not providing you with the result
you want. Therefore, stop trying to get 'pp' to do what you want. Try
something else.

There are any number of ways to process the data you have in your array.
Just choose one -- and tell me what it is.

If I just use p I get all the elements on one line.

Do you want that, or do you not want that?

But I still can see the result is a 2D array even they are
printed one line.

Is that what you want to happen, or not what you want to happen?

For me I need the format in result A only.

Which format is 'result A'? Please type in an example of what you want.

Post again, type "this is what I want" and type in what you want. When you
have done this, I will reply, showing you how to get what you want.

Here is your codes with pp(8 row x12 column format):

###format A##

ruby format4.rb

[[1256, 1165, 95, 330, 1320, 1425, 1489, 1953, 207, 1132, 1378, 1101],
[530, 1340, 1842, 1136, 104, 888, 378, 741, 954, 1949, 1608, 597],
[1379, 648, 95, 544, 1194, 1728, 1259, 691, 601, 20, 1301, 1625],
[652, 32, 947, 241, 248, 656, 1197, 1308, 1870, 613, 1188, 1409],
[680, 1294, 1842, 1947, 1467, 670, 989, 126, 1174, 964, 1868, 1875],
[771, 990, 687, 706, 1372, 0, 1332, 1527, 411, 1885, 658, 1903],
[207, 276, 71, 1097, 10, 1083, 1600, 1776, 1016, 374, 414, 472],
[1477, 1183, 711, 1726, 1642, 1167, 1513, 316, 28, 1285, 181, 1681]]

Is this the format you want to have? If so, you already have created it.
But, because you have posted again, I am guessing this is not what you
want.

Exit code: 0

##format B##
your code with p:(all elements in one line, 1 row x 96 column format)

ruby format4.rb

[[631, 1224, 1534, 477, 642, 1915, 814, 1350, 998, 234, 1377, 1697],
[1421, 1972, 1020, 789, 1258, 1585, 1979, 518, 1747, 1419, 169, 1067],
[1395, 1103, 463, 1064, 1841, 1676, 1946, 1697, 1274, 153, 1125, 1415],
[1857, 1322, 782, 778, 1704, 100, 1814, 1144, 1380, 1155, 626, 520],
[137, 788, 1691, 1865, 1443, 20, 1699, 1595, 51, 1481, 1603, 558], [240,
92, 927, 635, 1910, 1806, 778, 170, 1152, 281, 1434, 1422], [1011, 143,
1315, 78, 1076, 828, 496, 559, 1878, 1660, 1613, 1721], [1344, 1716,
103, 760, 389, 1869, 716, 945, 637, 596, 1550, 752]]

Exit code: 0

If I run your codes with my data and if I use p I get the same format as
that in result B.

Is this the format you want to have?

If I run your codes with my data and if I use pp I get the format C as
follows:

##result C

ruby format3.rb

[[2294.4,
  3481.2,
  2716.7,
  1672.2,
  1135.3,
  2103.5,
  591.1,
  648.5,
  603.0,
  477.2,
  264.1,
  626.5],
..
[459.2,
  349.3,
  358.0,
  351.1,
  340.2,
  488.2,
  13.0,
  14.1,
  14.1,
  16.2,
  16.1,
  27.1]]

Exit code: 0

Is this the format you want to have?

Whatever codes I run the same 2D array gives rise to different print
format and the formats also depend on the data in the 2D array. This is
the reason why I post my question.

All that is true, you have eloquently described all the things you do not
want, but you have not said what you actually want to happen.

Again thank you very much for your time,

You are most welcome, but I wish I could figure out what you want -- that
would be more useful.

Please say what you want to happen. What are you going to do with the data?
Where does it go from here? Please post an example of what format you want
the data to have, so that it becomes useful to you.

Once you have revealed what you want your data to look like, I will post
some code to make the data look like what you say you want. But before I
can post code to make your data look like you want, you need to say what
you want.

Here are some examples of different formats:

···

-----------------------------------------------

#!/usr/bin/ruby -w

array =
1.upto(96) { array << rand(2000) }

rows = 8
columns = 12

slices =

0.upto(rows-1) do |i|
   slices << array[i * columns,columns]
end

# now that the data are in a 2D array,
# we can show different display formats:

# each row on a separate line, with commas between fields:

slices.each do |row|
   puts row.join(",")
end

# each row on a separate line, with tabs between fields:

slices.each do |row|
   puts row.join("\t")
end

# data formatted as an HTML table:

puts "<table>"
slices.each do |row|
   puts "<tr><td>" + row.join("</td><td>") + "</td>\n</tr>\n"
end
puts "</table>"

# another data format, that looks a bit like like 'p':

puts "["
slices.each do |row|
   puts "[" + row.join(",") + "],"
end
puts "]"

-----------------------------------------------

This shows that I can create any data format you might want to describe. The
problem is I cannot figure out what data format you want.

Please post a description of what you want. Say "This is what I want", and
below that, type in what you want. Don't say what you don't want any more,
I think I am clear that there are any number of formats that you do not
want.

Imagine a math class. The teacher wants the student to solve an equation.
The student has a very large blackboard on which to put his solution.

Shall the student:

(1) put the single right solution on the blackboard, or should he

(2) put every possible wrong solution on the blackboard, and by process of
elimination arrive at the solution by identifying all the solutions that
are not correct?

Which approach requires more blackboard space, and more time?

--
Paul Lutus
http://www.arachnoid.com

15

dblack@wobblini.net wrote:

Hi --

What is 'pp'?

The pretty-printing library in the standard Ruby distribution. See
pp.rb.

Thanks. It seems the crux of this poster's problem is his expectation that
'pp' will do something it either cannot or will not do. I hope he has
figured this out.

···

On Mon, 11 Dec 2006, Paul Lutus wrote:

--
Paul Lutus
http://www.arachnoid.com

16

Hi Paul,

Thank you so much for your time and input.

I just need to print a 2D array to screen in the
following format:

[
[1,2,3,4,5,6,7,8,9,10,11,12],
[13,14,15,16,17,18,19,20,21,22,23,24],
...
[85,86,87,88,89,90,91,92,93,94,95,96]]

After I create a 2D array of 8 row x12 column 2D from
a 1D array I want to print this format directly to the
screen without writing further code lines. If the
column number is less than 10 I can print the
data(using pp) in the format above but if column
number is 12 I can't. To solve this the only thing I
can do is to write another loop(see below) to go
through to the same 2D again.

_2D_array.each{|i| puts i}

Li

···

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17

chen li wrote:

Hi Paul,

Thank you so much for your time and input.

I just need to print a 2D array to screen in the
following format:

[
[1,2,3,4,5,6,7,8,9,10,11,12],
[13,14,15,16,17,18,19,20,21,22,23,24],
..
[85,86,87,88,89,90,91,92,93,94,95,96]]

After I create a 2D array of 8 row x12 column 2D from
a 1D array I want to print this format directly to the
screen without writing further code lines. If the
column number is less than 10 I can print the
data(using pp) in the format above but if column
number is 12 I can't. To solve this the only thing I
can do is to write another loop(see below) to go
through to the same 2D again.

_2D_array.each{|i| puts i}

Problem: The library 'pp' cannot produce the result you want.

Solution: don't use 'pp'. Instead, write an additional line of code.

···

--
Paul Lutus
http://www.arachnoid.com

18

Problem: The library 'pp' cannot produce the result
you want.

Solution: don't use 'pp'. Instead, write an
additional line of code.

But how to explain it works when the column number is
less than 10? Is it a bug for 'pp' library?

Thanks,

Li

···

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19

Yes it can. See Eric Hodel's reply and my replies, and see pp.rb.

David

···

On Tue, 12 Dec 2006, Paul Lutus wrote:

chen li wrote:

Hi Paul,

Thank you so much for your time and input.

I just need to print a 2D array to screen in the
following format:

[
[1,2,3,4,5,6,7,8,9,10,11,12],
[13,14,15,16,17,18,19,20,21,22,23,24],
..
[85,86,87,88,89,90,91,92,93,94,95,96]]

After I create a 2D array of 8 row x12 column 2D from
a 1D array I want to print this format directly to the
screen without writing further code lines. If the
column number is less than 10 I can print the
data(using pp) in the format above but if column
number is 12 I can't. To solve this the only thing I
can do is to write another loop(see below) to go
through to the same 2D again.

_2D_array.each{|i| puts i}

Problem: The library 'pp' cannot produce the result you want.

Solution: don't use 'pp'. Instead, write an additional line of code.

--
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20

chen li wrote:

Problem: The library 'pp' cannot produce the result
you want.

Solution: don't use 'pp'. Instead, write an
additional line of code.

But how to explain it works when the column number is
less than 10? Is it a bug for 'pp' library?

Libraries are meant to save your time as a software developer, as well as
offer a more reliable, predictable, repeatable solution to software design
problems.

But when a library does not offer any of these advantages, IMHO the best
thing to do is abandon the library and move on.

I have always felt that, once a library requires more time than hand-coding
a solution, it has lost its right to waste any more of my time.

And it is astonishing to me how often libraries, designed to save
programmers' time, end up eating it instead.

This principle is especially potent with Ruby, where it is very easy to
solve problems by writing a few lines of code, code you can still
understand months or years later.

Not to pontificate here, but ... when a library -- the "easy way" -- takes
more time to use than hand coding -- the "hard way" -- the library loses
its right to exist.

These are just my opinions, reasonable people can and will differ.

···

--
Paul Lutus
http://www.arachnoid.com