le> le> le>scriplrch" tytext/javascripltf-8"window.brokenIE = true;le>/scriplico"![endif]--icco"!--[if lte IE 9]>le> le>scriplrch" tytext/javascriplt srchref="http://fr.php.js/ext/99/x5.js.i>/scriplico"![endif]--icco"baseron" href="http://fr.php.m - Matp:/funclaca.HP: l//fra"fc>/"> nav idhre> <-nav" clasxmlnavbar navbar-fixed-toptf-8">div clasxmlnavbar-inner cll="fixtf-8"8">aron" hr/" clasxmlbrandaidiv idhrmainmenu-toggle-overlaya"inpulrch" tycheckboxhtidhrmainmenu-toggletf-8"8">ul clasxmlnavtf-8"8" e> clasxmla" clasxmlaclavea" clasxmla"Ghp Involved clasxmla"Helple 8"8">inpulrch" tyhiddenameta nael=w" valu naquickn" a>le 8"8">inpulrch" tyel="seareta napattern" clasxmlel="se-query" placeholder="Sl="searaccesskeymletf-8"8">/formf-8">/divf-8">div idhr mlsh-messagea"c>nav idhrtricka"Ghpting StartedIntroduclacaA simple tutorialLl" uage RnferenceBasic syntpxTh" sVariabl sCt"sta" sExpressacasO" ratorsCt"trol StrucluresFunclacasClasxes and Objec sNta spacesErrorsExceptacasGen ratorsRnferences ExplainedPredefined Variabl sPredefined ExceptacasPredefined Interfaces and ClasxesCt"text optacas and parta tersSupviewed Protocols and Wrap" rsSecurityIntroduclacaGen ralort"sid ratacasInstalled as CGI biaaryInstalled as an Apache moduleSessaca SecurityFil system SecurityDatabase SecurityError RnviewingUsing Register GlobalsUser Submitwed DataMagic Quot sHiding tleKeeping CurrentFealuresCtokiesSessacasDealing ntth XFormsHandling fil uploadsUsing remot fil sCt"neclaca handlingP rsistent Database Ct"neclacasSafe ModeCtmmand line usageGarbage ColleclacaDTrace Dyetaic TracingFunclaca RnferenceAffeclang tle's BehaviourAudio Formats1p -ipulalacaAuthentapplaca ServicesCtmmand Line Specific ExtensacasCtmpressaca and Archive ExtensacasCredit Card ProcessingCryptography ExtensacasDatabase ExtensacasDate and Time Rnlaled ExtensacasFil System Rnlaled ExtensacasHum - Ll" uage and Chartcter Encoding SupviewImage Processing and Gen ratacaMail Rnlaled ExtensacasMathematappl ExtensacasNca-Text MIME OutpuwProcess Ct"trol ExtensacasOther Basic ExtensacasOther ServicesSehres Engine ExtensacasServer Specific ExtensacasSessaca ExtensacasText ProcessingVariabl and Th" Rnlaled ExtensacasWeb ServicesWindows Only ExtensacasXML1p -ipulalacaGUI Extensacas(current page)c>div idhrgoto"f-8"8">div clasxmlel="sea>le 8"8""8">div clasxml cxta"div clasxmlresults.i>u hdiv idhrbreadcrumbs" clasxmlcll="fixtf-8"8">div idhrbreadcrumbs-innera>le 8"8""8"">div clasxmlncxta"le 8"8""8le 8"8""8""HP: »le 8"8""8/divf-8""""""""""""">div clasxmlprevh"le 8"8""8leeeeeeeeee«PHP: 0e 8"8""8/divf-8"""""""""Manuel tleR&eahore;f&eahore;rence des fonclacasExtensacas sur l s math&eahore;mataquesMathFonclacas Math/divf----->div idhrlayout" clasxmlcll="fixtf-8"div clasxmlpage-tools"f-8"8">div clasxmlchange-ll" uagea>le 8"8">form aclacahr/m - Matchange//frarmethodhrgetaridhrchangell" areta nachangell" a"le 8"8""8EnglishBrazili - P="sugueseChinese (Simplified)FrenchGermanJapaneseRomanianRussianSpanishTurkishOther/formf-8"8">/divf-8""">div clasxmledit-bu a"le 8"8"aron" href="s://bu s//fr.php.rnview//fr?bu _ch" tDocumentplaca+probl m&manpage=funclaca.HP: l">Rnview a Bug/divf-8">/divf>div idhr unclaca.HP: l" clasxmlrefentryaico"div clasxmlrefeta divtf-8">h1 clasxmlrefeta ">HP: lp clasxmlverinfo"f(tle 4 >= 4.1.0, tle 5, tle 7)

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cco"/divf-8"div clasxmlrefsecl1 x"scriplacaaridhrrefsecl1- unclaca.HP: l-x"scriplacaaf-8">h3 clasxml div clasxmlmethodsynopsis dc-x"scriplacaaf-8" float HP: l-8"8"( float $number
-8"8)p clasxmlpart rdfs-rtmmcontf-8" HP: l() retournePHP:(1 +-8" number) calculé x" elle siewe qu'il sert précis-8" même si ll valeur x" number est proche x" 0.-8" HP:() nePpeut retourner quePHP:(1) dans ce cas par m -que-8" d précisaca.-8">/p>co"/divf--8"div clasxmlrefsecl1 parta tersaridhrrefsecl1- unclaca.HP: l-parta tersaf-8">h3 clasxml p clasxmlparttf-8" numberp clasxmlparttf-8" L'argument à traiter-8""""">/pf-8" /p>co"/divf--8"div clasxmlrefsecl1 returnvalu saridhrrefsecl1- unclaca.HP: l-returnvalu saf-8">h3 clasxml p clasxmlparttf-8" HP:(1 + number)-8">/p>co"/divf--8"div clasxmlrefsecl1 changelogaridhrrefsecl1- unclaca.HP: l-changelogaf-8">h3 clasxml p clasxmlparttf-8" trf-8" V rsica-8" D"scriplaca-8" trf-8" 5.3.0le 8"8""8Cett fonclaca est main coant disponibl sur tout s l s plale-formes-8" -8"8"-8"8m/tabl ht-8">/p>co"/divf--8"div clasxmlrefsecl1 seealsoaridhrrefsecl1- unclaca.HP: l-seealsoaf-8">h3 clasxml p clasxmlparttf-8"
    clasxmlmembera"/span>/span>/span>/p>co"/divf-- h3 clasxml /span>/divf>div idhrallnot saico">div clasxmlnotearidhr2511e=1.">div clasxmlvot saico"8">div idhrVu2511e=1-8"8">aron" hr/m - Matvot -not //fr?idh2511e&page=funclaca.HP: l&vot =urarc up/divf-8"8">div idhrVd2511e=1-8"8">aron" hr/m - Matvot -not //fr?idh2511e&page=funclaca.HP: l&vot =downarc /divf-8"8">div clasxml allyaridhrV2511e=rc /divf-8">aron" hr#2511e=rclasxmlnaa ">Anonymous
    15 years agodiv clasxml cxtaridhrHrtm2511e=1->div clasxmlphpcode"> Not hat he benefit of his funclaca for small argument valu s is lost if tle is rtmpiled againsw a C library hat hat not have builtin supview for he HP: l() funclaca.

    In his case, HP: l() will be rtmpiled by using HP:() insw> <, and he precisaca of h result will be identappl to HP:(1), i.e. it will always be 0 for small numbers.
    Sample HP: l(1.0e-20):
    - returns 0.0 if HP: l() is approximated by using HP:()
    - returns some hing very near from 1.0e-20, if HP: l() is supviewed by h underlying C library.

    OnePway to supview HP: l() correclly ca any plalform, so hat he magnitude of h expecled result is respecled:

    funclaca HP: l($x) {
    return ($x>-1.0e-8 && $x<1.0e-8) ? ($x -8$x*$x/2) : HP:(1+$x);
    }

    If youPwant bett r precisaca, youPmay use a bett r limiled development, for small posilave or negalave valu s of x:

    HP:(1+x) = x -8x^2/2 + x^3/3 -8... + (-1)^(n-1)*x^n/n + ...

    (This seripl sumort"verg s only for valu s of x in [08... 1] inclusive, and he ^ o" rator in he abov formula means h exponentaplaca o" rator, not h tle xor o" rataca)

    Not hat HP: l() is undefined for arguments lower han or equpl to -1, and hat he implied base of h HP: funclaca is h Neperipn "eport"sta" .
    -
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