multidimensional array insert syntax
in [Ruby]
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From: Dave Castellano on 27 Jul 2010 22:02 Hi, Can anyone help me with the correct syntax to insert into a multidimensional array... answer_choices = [ [incorrect_ans_2, incorrect_anno_2], [incorrect_ans_3, incorrect_anno_3], [incorrect_ans_4, incorrect_anno_4], [incorrect_ans_5, incorrect_anno_5] ] # Randomly insert correct answer. x = rand(4) answer_choices.insert???????? correct_ans_1 answer_choices.insert???????? correct_anno_1 I want to insert correct_ans_1 into position [x,0] and correct_anno_1 into position [x,0]. Thanks, DC -- Posted via http://www.ruby-forum.com/.
From: Jesús Gabriel y Galán on 28 Jul 2010 05:02 On Wed, Jul 28, 2010 at 4:02 AM, Dave Castellano <dcastellano1(a)wideopenwest.com> wrote: > Hi, > > Can anyone help me with the correct syntax to insert into a > multidimensional array... > > answer_choices = [ > [incorrect_ans_2, incorrect_anno_2], > [incorrect_ans_3, incorrect_anno_3], > [incorrect_ans_4, incorrect_anno_4], > [incorrect_ans_5, incorrect_anno_5] > ] > > > # Randomly insert correct answer. > x = rand(4) > answer_choices.insert???????? correct_ans_1 > answer_choices.insert???????? correct_anno_1 > > > I want to insert correct_ans_1 into position [x,0] and correct_anno_1 > into position [x,0]. You nearly had it in that sentence: answer_choices[x][0] = correct_ans_1 answer_choices[x][1] = correct_ano_1 (I assume you wanted to insert the correct_anno_1 in position 1 of the array). Jesus.
From: Dave Castellano on 28 Jul 2010 06:56 Jesús Gabriel y Galán wrote: > On Wed, Jul 28, 2010 at 4:02 AM, Dave Castellano > <dcastellano1(a)wideopenwest.com> wrote: >> � ] >> >> >> # Randomly insert correct answer. >> �x = rand(4) >> �answer_choices.insert???????? �correct_ans_1 >> �answer_choices.insert???????? �correct_anno_1 >> >> >> I want to insert correct_ans_1 into position [x,0] and correct_anno_1 >> into position [x,0]. > > You nearly had it in that sentence: > > answer_choices[x][0] = correct_ans_1 > answer_choices[x][1] = correct_ano_1 > > (I assume you wanted to insert the correct_anno_1 in position 1 of the > array). > > Jesus. I actually want to insert rather than replace. Is there a way to do that?? Thanks! DC -- Posted via http://www.ruby-forum.com/.
From: Robert Klemme on 28 Jul 2010 07:08 On 28.07.2010 12:56, Dave Castellano wrote: > Jesús Gabriel y Galán wrote: >> On Wed, Jul 28, 2010 at 4:02 AM, Dave Castellano >> <dcastellano1(a)wideopenwest.com> wrote: >>> � ] >>> >>> >>> # Randomly insert correct answer. >>> �x = rand(4) >>> �answer_choices.insert???????? �correct_ans_1 >>> �answer_choices.insert???????? �correct_anno_1 >>> >>> >>> I want to insert correct_ans_1 into position [x,0] and correct_anno_1 >>> into position [x,0]. >> >> You nearly had it in that sentence: >> >> answer_choices[x][0] = correct_ans_1 >> answer_choices[x][1] = correct_ano_1 >> >> (I assume you wanted to insert the correct_anno_1 in position 1 of the >> array). >> >> Jesus. > > I actually want to insert rather than replace. Is there a way to do > that?? Use Array#insert. robert -- remember.guy do |as, often| as.you_can - without end http://blog.rubybestpractices.com/
From: Jesús Gabriel y Galán on 28 Jul 2010 07:09
On Wed, Jul 28, 2010 at 12:56 PM, Dave Castellano <dcastellano1(a)wideopenwest.com> wrote: > Jesús Gabriel y Galán wrote: >> On Wed, Jul 28, 2010 at 4:02 AM, Dave Castellano >> <dcastellano1(a)wideopenwest.com> wrote: >>> � ] >>> >>> >>> # Randomly insert correct answer. >>> �x = rand(4) >>> �answer_choices.insert???????? �correct_ans_1 >>> �answer_choices.insert???????? �correct_anno_1 >>> >>> >>> I want to insert correct_ans_1 into position [x,0] and correct_anno_1 >>> into position [x,0]. >> >> You nearly had it in that sentence: >> >> answer_choices[x][0] = correct_ans_1 >> answer_choices[x][1] = correct_ano_1 >> >> (I assume you wanted to insert the correct_anno_1 in position 1 of the >> array). >> >> Jesus. > > I actually want to insert rather than replace. Is there a way to do > that?? http://ruby-doc.org/core/classes/Array.src/M002161.html irb(main):001:0> a = [1,2,3,4] => [1, 2, 3, 4] irb(main):002:0> a[2,0] = 55 => 55 irb(main):003:0> a => [1, 2, 55, 3, 4] irb(main):004:0> a[2,0] = *[100,200,300] => [100, 200, 300] irb(main):005:0> a => [1, 2, 100, 200, 300, 55, 3, 4] and for multidimensional: irb(main):006:0> a = [[1,2,3],[4,5,6]] => [[1, 2, 3], [4, 5, 6]] irb(main):007:0> a[0][1,0] = 55 => 55 irb(main):008:0> a => [[1, 55, 2, 3], [4, 5, 6]] Take into account that in Ruby arrays are not really "multidimensional". They are just arrays that contain other arrays. It's not ensures that each array of a "dimension" has the same length, for example. When you do a[0] in the above, you get an array, on which you call the []= method. Jesus. |