动态预分配数组变量大小的有效方法是什么，它似乎在Matlab的每次循环迭代中改变了它的大小？可以使用zeros()矩阵对其进行初始化，但有时候非常棘手（例如：确定上限和下限）。
答案 0 :(得分：1)
这是我用于动态大小的2D数组的解决方案。假设我的数组的最大限制是2000x2000，那么我只是预先分配1-D矢量模拟的零（一个2000 ^ 2x1矢量）并在代码结束后摆脱零（或者只是在数据发生时忽略它们）如果需要，在代码结束后，一个直方图）和C:/Ruby200/lib/ruby/gems/2.0.0/gems/activerecord-4.2.3/lib/active_record/dynamic_matchers.rb:26:in `method_missing': undefined method `partia
iveRecord::Base:Class (NoMethodError)
from C:/Users/ryzal_000/Sites/dotforge/config/environment.rb:7:in `<top (required)>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `block in require'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:240:in `load_dependency'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/activesupport-4.2.3/lib/active_support/dependencies.rb:274:in `require'
from C:/Users/ryzal_000/Sites/dotforge/config.ru:3:in `block in <main>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `instance_eval'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:55:in `initialize'
from C:/Users/ryzal_000/Sites/dotforge/config.ru:in `new'
from C:/Users/ryzal_000/Sites/dotforge/config.ru:in `<main>'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `eval'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:49:in `new_from_string'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/builder.rb:40:in `parse_file'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:299:in `build_app_and_options_from_config'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:208:in `app'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:61:in `app'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/rack-1.6.4/lib/rack/server.rb:336:in `wrapped_app'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:139:in `log_to_stdout'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/server.rb:78:in `start'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:80:in `block in server'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `tap'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:75:in `server'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
from C:/Ruby200/lib/ruby/gems/2.0.0/gems/railties-4.2.3/lib/rails/commands.rb:17:in `<top (required)>'
from bin/rails:4:in `require'
from bin/rails:4:in `<main>'
......
例如：
reshape