Premik tinininh zapiskov, izgradnja g1smo, index update

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Jurij Podgoršek 2024-04-30 19:36:58 +02:00
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<!-- 2024-04-30 tor 19:34 -->
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Kompotov programerski bralni krožek #1: SICP</title>
@ -198,7 +198,7 @@
<body>
<div id="content" class="content">
<h1 class="title">Kompotov programerski bralni krožek #1: SICP</h1>
<div class="footer" id="orgc68e38d">
<div class="footer" id="org1d8372a">
<p>
Izvorna koda se nahaja na <a href="https://git.kompot.si/programerski-bralni-krozek/sicp">git.kompot.si</a>.
</p>
@ -214,18 +214,18 @@ Za bralni krožek se dogovarjamo prek (javne) mailing liste, na katero se lahko
</p>
<div id="org4347591" class="figure">
<div id="org38f7e3a" class="figure">
<p><img src="./tb.jpg" alt="tb.jpg" />
</p>
</div>
<div id="outline-container-org56c0caa" class="outline-2">
<h2 id="org56c0caa">Srečanja</h2>
<div class="outline-text-2" id="text-org56c0caa">
<div id="outline-container-org18750df" class="outline-2">
<h2 id="org18750df">Srečanja</h2>
<div class="outline-text-2" id="text-org18750df">
</div>
<div id="outline-container-orge0aad10" class="outline-3">
<h3 id="orge0aad10">#2: torek, 30. 4. 2024 18.45 v CTK</h3>
<div class="outline-text-3" id="text-orge0aad10">
<div id="outline-container-orga4d4882" class="outline-3">
<h3 id="orga4d4882">#2: torek, 30. 4. 2024 18.45 v CTK</h3>
<div class="outline-text-3" id="text-orga4d4882">
<p>
Dogodek je <a href="https://dogodki.kompot.si/events/8435c26d-4dbd-4e28-94c2-a237c837865d">tukaj</a>.
</p>
@ -234,11 +234,21 @@ Dogodek je <a href="https://dogodki.kompot.si/events/8435c26d-4dbd-4e28-94c2-a23
Nadaljujemo z branjem poglavja 1.2, Procedures and the processes they generate.
</p>
</div>
<div id="outline-container-org7896879" class="outline-4">
<h4 id="org7896879">zapiski</h4>
<div class="outline-text-4" id="text-org7896879">
<ul class="org-ul">
<li><a href="zapiski/sicp_1_2_tina.md">tina</a> (<a href="zapiski/sicp_1_2_tina.scm">vaje</a>)</li>
<li><a href="zapiski/2_g1smo.html">g1smo</a></li>
</ul>
</div>
</div>
</div>
<div id="outline-container-org83a5c4d" class="outline-3">
<h3 id="org83a5c4d">#1: sreda, 17. 4. 2024 18.45 v CTK</h3>
<div class="outline-text-3" id="text-org83a5c4d">
<div id="outline-container-orgde14da4" class="outline-3">
<h3 id="orgde14da4">#1: sreda, 17. 4. 2024 18.45 v CTK</h3>
<div class="outline-text-3" id="text-orgde14da4">
<p>
Beremo uvod in do poglavja 1.2, približno 30 strani.
</p>
@ -248,9 +258,9 @@ Link do <a href="https://dogodki.kompot.si/events/76672075-1c6f-48f1-bc37-05dde9
</p>
</div>
<div id="outline-container-orge8fa148" class="outline-4">
<h4 id="orge8fa148">zapiski</h4>
<div class="outline-text-4" id="text-orge8fa148">
<div id="outline-container-org45a1c19" class="outline-4">
<h4 id="org45a1c19">zapiski</h4>
<div class="outline-text-4" id="text-org45a1c19">
<ul class="org-ul">
<li><a href="zapiski/1_g1smo.html">g1smo</a></li>
</ul>

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@ -19,6 +19,10 @@ Dogodek je [[https://dogodki.kompot.si/events/8435c26d-4dbd-4e28-94c2-a237c83786
Nadaljujemo z branjem poglavja 1.2, Procedures and the processes they generate.
*** zapiski
- [[file:zapiski/sicp_1_2_tina.md][tina]] ([[file:zapiski/sicp_1_2_tina.scm][vaje]])
- [[file:zapiski/2_g1smo.org][g1smo]]
** #1: sreda, 17. 4. 2024 18.45 v CTK
Beremo uvod in do poglavja 1.2, približno 30 strani.

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<h1 class="title">Zapiski #2 srečanja programerskega bralnega krožka SICP</h1>
<div id="outline-container-org140b667" class="outline-2">
<h2 id="org140b667">Teme</h2>
<div class="outline-text-2" id="text-org140b667">
</div>
<div id="outline-container-org9a1775f" class="outline-3">
<h3 id="org9a1775f">Rekurzivni procesi in rekurzivne procedure (postopki?)</h3>
<div class="outline-text-3" id="text-org9a1775f">
<p>
Rekurzivne procedure lahko opišejo iterativne procese.
Pri iterativnih procesih je stanje popolnoma ujeto s tremi spremenljivkami stanja (v danem primeru knjige). Pri rekurzivnih procesih mora interpreter imeti sklad klicev, zato z vsakim klicom raste poraba spomina. Repno-rekurzivne implementacije omogočajo definiranje iterativnih procesov z rekurzivnimi procedurami.
</p>
</div>
</div>
<div id="outline-container-orgabb9953" class="outline-3">
<h3 id="orgabb9953">Drevesne rekurzije</h3>
</div>
<div id="outline-container-org4cf370b" class="outline-3">
<h3 id="org4cf370b">(velikostni) redi rasti</h3>
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</div>
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<h2 id="org9b0e233">Vaje</h2>
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</div>
<div id="outline-container-orga2a1e2b" class="outline-3">
<h3 id="orga2a1e2b">1.9 TODO</h3>
<div class="outline-text-3" id="text-orga2a1e2b">
<p>
Procesa sta rekurzivna?
</p>
</div>
</div>
<div id="outline-container-org383fe47" class="outline-3">
<h3 id="org383fe47">1.10 TODO</h3>
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<h3 id="orga8d925d">1.11 TODO</h3>
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<h3 id="org9c0dd0c">1.12 TODO</h3>
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<h3 id="org2f7ffcd">1.13 TODO</h3>
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<h3 id="org3d0968f">1.14 TODO</h3>
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<h3 id="orgce0ddf0">1.15 TODO</h3>
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<div id="outline-container-org401fb73" class="outline-3">
<h3 id="org401fb73">1.16 TODO</h3>
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<div id="outline-container-orgb06d6bf" class="outline-3">
<h3 id="orgb06d6bf">1.17 TODO</h3>
</div>
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</div>
<div id="postamble" class="status">
<p class="author">Author: Jurij</p>
<p class="date">Created: 2024-04-30 tor 19:36</p>
<p class="validation"><a href="https://validator.w3.org/check?uri=referer">Validate</a></p>
</div>
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<div id="content" class="content">
<div id="table-of-contents" role="doc-toc">
<h2>Table of Contents</h2>
<div id="text-table-of-contents" role="doc-toc">
<ul>
<li><a href="#org93aaa17">1. rekurzivna procedura v Lisp-u odraža princip, da se pri klicanju procedure sklicuje na samo proceduro</a></li>
<li><a href="#orgd5912a3">2. rekurziven proces opisuje obliko evolucije računskega postopka</a></li>
<li><a href="#orgec1b0cf">3. procedura kliče samo sebe, dokler ni dosežen robni pogoj (aplikativni red)</a></li>
<li><a href="#org76383d3">4. pri tem mora interpreter v spominu ohranjati zapis o potrebnih izvedbah procedure &#x2013;&gt; zaradi tega prostorska zahtevnost O(n)</a></li>
<li><a href="#orgcb17a6f">5. to se imenuje veriga preloženih operacij (? chain of deferred operations)</a></li>
<li><a href="#orgc80a02e">6. ko se funkcija kliče na vhodu, ki ustreza robnim pogojem, se nato v nasprotnem vrstnem redu funkcija aplicira na vhodno vrednost in izvede &#x2013;&gt; časovna zahtevnost O(n)</a></li>
<li><a href="#org6b69e77">7. klasičen primer: fakulteta \[n!\]; rekurzivna definicija: \[n! = n(n-1)!\]</a></li>
<li><a href="#org74a8e18">8. stanje procedure je enolično opisano na vsakem koraku: spremenljivke stanja</a></li>
<li><a href="#org47384f6">9. poleg tega obstaja enoličen predpis za pripisovanje novih (posodobljenih) vrednosti spremenljivkam stanja po vsaki izvedbi procedure</a></li>
<li><a href="#org549d0ea">10. prostorska zahtevnost je tako O(1) - stanje je vsakič shranjeno v istem številu spremenljivk</a></li>
<li><a href="#orgf0a4623">11. časovna zahtevnost je O(n)</a></li>
<li><a href="#orgd43928a">12. tudi pri iterativnih procesih procedura kliče sama sebe, vendar je razlika v postopku izvajanja; medtem ko se mora rekurzivni proces zaradi pomnenja verige preloženih operacij izvesti v celoti, lahko iterativni proces na katerikoli točki prekinemo in nato nadaljujemo na podlagi vrednosti spremenljivk stanja ob prekinitvi</a></li>
<li><a href="#orgb04cf1f">13. v tem primeru govorimo o repni rekurziji (slovarček); zanke (while, for, &#x2026;) v ostalih jezikih so tako samo posebne sintaktične oblike repne rekurzije</a></li>
<li><a href="#org657a8b3">14. pri linearni rekurziji vsak korak vsebuje en klic procedure</a></li>
<li><a href="#orgaf71f97">15. če se na posameznem koraku procedura kliče večkrat (korak je odvisen od večih prejšnjih vrednosti), je struktura procesa drevesna</a></li>
<li><a href="#org55b55eb">16. eksponentna časovna zahtevnost: O(exp(n))</a></li>
<li><a href="#orga834ed4">17. linearna prostorska zahtevnost: O(n) - v spominu moramo na vsakem koraku ohraniti samo vrednosti v vozliščih na prejšnjem nivoju globine drevesa</a></li>
<li><a href="#orgf8bf024">18. klasični primer: Fibonaccijeva števila; \[Fib(n) = Fib(n-1) + Fib(n-2)\]</a></li>
</ul>
</div>
</div>
<p>
## Vzorci evolucije procesov
</p>
<p>
procedura: vzorec lokalne evolucije računalniškega procesa
</p>
<p>
Kaj pa lahko rečemo o globalnih vzorcih?
</p>
<p>
### 1.2.1 Linearna rekurzija in iteracija
</p>
<p>
razlika med rekurzivno proceduro in rekurzivnim procesom:
</p>
<div id="outline-container-org93aaa17" class="outline-2">
<h2 id="org93aaa17"><span class="section-number-2">1.</span> rekurzivna procedura v Lisp-u odraža princip, da se pri klicanju procedure sklicuje na samo proceduro</h2>
</div>
<div id="outline-container-orgd5912a3" class="outline-2">
<h2 id="orgd5912a3"><span class="section-number-2">2.</span> rekurziven proces opisuje obliko evolucije računskega postopka</h2>
<div class="outline-text-2" id="text-2">
<p>
Rekurzivni procesi:
</p>
</div>
</div>
<div id="outline-container-orgec1b0cf" class="outline-2">
<h2 id="orgec1b0cf"><span class="section-number-2">3.</span> procedura kliče samo sebe, dokler ni dosežen robni pogoj (aplikativni red)</h2>
</div>
<div id="outline-container-org76383d3" class="outline-2">
<h2 id="org76383d3"><span class="section-number-2">4.</span> pri tem mora interpreter v spominu ohranjati zapis o potrebnih izvedbah procedure &#x2013;&gt; zaradi tega prostorska zahtevnost O(n)</h2>
</div>
<div id="outline-container-orgcb17a6f" class="outline-2">
<h2 id="orgcb17a6f"><span class="section-number-2">5.</span> to se imenuje veriga preloženih operacij (? chain of deferred operations)</h2>
</div>
<div id="outline-container-orgc80a02e" class="outline-2">
<h2 id="orgc80a02e"><span class="section-number-2">6.</span> ko se funkcija kliče na vhodu, ki ustreza robnim pogojem, se nato v nasprotnem vrstnem redu funkcija aplicira na vhodno vrednost in izvede &#x2013;&gt; časovna zahtevnost O(n)</h2>
</div>
<div id="outline-container-org6b69e77" class="outline-2">
<h2 id="org6b69e77"><span class="section-number-2">7.</span> klasičen primer: fakulteta \[n!\]; rekurzivna definicija: \[n! = n(n-1)!\]</h2>
<div class="outline-text-2" id="text-7">
<p>
Iterativni procesi:
</p>
</div>
</div>
<div id="outline-container-org74a8e18" class="outline-2">
<h2 id="org74a8e18"><span class="section-number-2">8.</span> stanje procedure je enolično opisano na vsakem koraku: spremenljivke stanja</h2>
</div>
<div id="outline-container-org47384f6" class="outline-2">
<h2 id="org47384f6"><span class="section-number-2">9.</span> poleg tega obstaja enoličen predpis za pripisovanje novih (posodobljenih) vrednosti spremenljivkam stanja po vsaki izvedbi procedure</h2>
</div>
<div id="outline-container-org549d0ea" class="outline-2">
<h2 id="org549d0ea"><span class="section-number-2">10.</span> prostorska zahtevnost je tako O(1) - stanje je vsakič shranjeno v istem številu spremenljivk</h2>
</div>
<div id="outline-container-orgf0a4623" class="outline-2">
<h2 id="orgf0a4623"><span class="section-number-2">11.</span> časovna zahtevnost je O(n)</h2>
<div class="outline-text-2" id="text-11">
<p>
Razlike:
</p>
</div>
</div>
<div id="outline-container-orgd43928a" class="outline-2">
<h2 id="orgd43928a"><span class="section-number-2">12.</span> tudi pri iterativnih procesih procedura kliče sama sebe, vendar je razlika v postopku izvajanja; medtem ko se mora rekurzivni proces zaradi pomnenja verige preloženih operacij izvesti v celoti, lahko iterativni proces na katerikoli točki prekinemo in nato nadaljujemo na podlagi vrednosti spremenljivk stanja ob prekinitvi</h2>
</div>
<div id="outline-container-orgb04cf1f" class="outline-2">
<h2 id="orgb04cf1f"><span class="section-number-2">13.</span> v tem primeru govorimo o repni rekurziji (slovarček); zanke (while, for, &#x2026;) v ostalih jezikih so tako samo posebne sintaktične oblike repne rekurzije</h2>
<div class="outline-text-2" id="text-13">
<p>
### 1.2.2 Drevesna rekurzija
</p>
</div>
</div>
<div id="outline-container-org657a8b3" class="outline-2">
<h2 id="org657a8b3"><span class="section-number-2">14.</span> pri linearni rekurziji vsak korak vsebuje en klic procedure</h2>
</div>
<div id="outline-container-orgaf71f97" class="outline-2">
<h2 id="orgaf71f97"><span class="section-number-2">15.</span> če se na posameznem koraku procedura kliče večkrat (korak je odvisen od večih prejšnjih vrednosti), je struktura procesa drevesna</h2>
</div>
<div id="outline-container-org55b55eb" class="outline-2">
<h2 id="org55b55eb"><span class="section-number-2">16.</span> eksponentna časovna zahtevnost: O(exp(n))</h2>
</div>
<div id="outline-container-orga834ed4" class="outline-2">
<h2 id="orga834ed4"><span class="section-number-2">17.</span> linearna prostorska zahtevnost: O(n) - v spominu moramo na vsakem koraku ohraniti samo vrednosti v vozliščih na prejšnjem nivoju globine drevesa</h2>
</div>
<div id="outline-container-orgf8bf024" class="outline-2">
<h2 id="orgf8bf024"><span class="section-number-2">18.</span> klasični primer: Fibonaccijeva števila; \[Fib(n) = Fib(n-1) + Fib(n-2)\]</h2>
</div>
</div>
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