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    Min. z value of some points

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    • thomthomT Offline
      thomthom
      last edited by

      Haven't checked if it is faster, but BoundingBox might help:

      <span class="syntaxdefault">bb </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> Geom</span><span class="syntaxkeyword">;;</span><span class="syntaxdefault">BoundingBox</span><span class="syntaxkeyword">.new<br /></span><span class="syntaxdefault">bb</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">add</span><span class="syntaxkeyword">(</span><span class="syntaxdefault"> points </span><span class="syntaxkeyword">)<br /></span><span class="syntaxdefault">min </span><span class="syntaxkeyword">=</span><span class="syntaxdefault"> bb</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">min</span><span class="syntaxkeyword">.</span><span class="syntaxdefault">z</span>
      

      Since it's SU's native code doing the handling of the points, it might yield faster calculations.

      Thomas Thomassen — SketchUp Monkey & Coding addict
      List of my plugins and link to the CookieWare fund

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      • N Offline
        niccah
        last edited by

        oh thank you very much!

        I saw the function "inject", but I ignored them because I thought, that's not interesting for me.

        Just for the sake of completeness: One have to add a "Geom::" in the front of "BoundingBox.new"

        Thanks a lot again for your help!

        br

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        • thomthomT Offline
          thomthom
          last edited by

          @niccah said:

          Just for the sake of completeness: One have to add a "Geom::" in the front of "BoundingBox.new"

          👍 Good catch! Updated the example.

          Thomas Thomassen — SketchUp Monkey & Coding addict
          List of my plugins and link to the CookieWare fund

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          • fredo6F Offline
            fredo6
            last edited by

            to be absolutely accurate, I guess the inject statement should be

            min = points.inject(points[0].z) { |m,pt| ( pt.z < m ) ? pt.z : m }

            Fredo

            PS: Did not know this method, as it is not documented in the Pragmatic Programmer's guide. Seems useful and elegant

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            • Dan RathbunD Offline
              Dan Rathbun
              last edited by

              @unknownuser said:

              PS: Did not know this method, as it is not documented in the Pragmatic Programmer's guide. Seems useful and elegant

              Do not use the object reference from that OLD guide, which was written in the Ruby v 1.6.x timeframe. (The tutorial text is still relevant and recommended, however.)

              Instead use the v 1.8.6 CHM here

              or access on-line http://www.ruby-doc.org/core-1.8.6/index.html.

              Note that these methods come from the mixin module Enumerable which is mixed into Array, Hash, IO (and subclasses, such as File,) Range, String, Struct, ... etc.

              I'm not here much anymore.

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              • Dan RathbunD Offline
                Dan Rathbun
                last edited by

                @unknownuser said:

                to be absolutely accurate, I guess the inject statement should be

                min = points.inject(points[0].z) { |m,pt| ( pt.z < m ) ? pt.z : m }

                At, one time, in another thread, we were comparing various methods of getting min and max, speedwise.

                There is also:

                min_z = points.min {|a,b| a.z <=> b.z }

                Can't remember which was the faster.

                P.S.: Because min and max are method names in Enumerable, and that they are mixed into quite a few classes, .. it is recommended to not use them as var names.
                Difference them. It seems that the API's tradition is to add an "_" and then a descriptor: min_x, min_y, min_z, min_height, min_width, min_size, etc.

                I'm not here much anymore.

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                • N Offline
                  niccah
                  last edited by

                  This forum is amazing!

                  I learn a lot from you! Thanks a lot for all these information!

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                  • D Offline
                    david.
                    last edited by

                    This is how I would do it:

                    minZ = points.collect { |pt| pt.z }.min
                    
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                    • Dan RathbunD Offline
                      Dan Rathbun
                      last edited by

                      @david: Your example should be slower, as it must iterate 2 arrays, and also create a temporary array.

                      Why ?? (I suspect you like the "readability" of your version.)

                      I'm not here much anymore.

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                      • D Offline
                        david.
                        last edited by

                        Yes, readability. If it was operating on large quantities of data, I would definitely use your suggested method.

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