LazStats: Add tests.

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@7925 8e941d3f-bd1b-0410-a28a-d453659cc2b4

applications/lazstats/tests/gammaln_test/Project1.lpi

@@ -0,0 +1,72 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="12"/>
+    <PathDelim Value="\"/>
+    <General>
+      <Flags>
+        <MainUnitHasCreateFormStatements Value="False"/>
+        <MainUnitHasTitleStatement Value="False"/>
+        <MainUnitHasScaledStatement Value="False"/>
+      </Flags>
+      <SessionStorage Value="InProjectDir"/>
+      <Title Value="Project1"/>
+      <UseAppBundle Value="False"/>
+      <ResourceType Value="res"/>
+    </General>
+    <BuildModes>
+      <Item Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <UseFileFilters Value="True"/>
+    </PublishOptions>
+    <RunParams>
+      <FormatVersion Value="2"/>
+    </RunParams>
+    <RequiredPackages>
+      <Item>
+        <PackageName Value="TAChartLazarusPkg"/>
+      </Item>
+      <Item>
+        <PackageName Value="LMath"/>
+      </Item>
+    </RequiredPackages>
+    <Units>
+      <Unit>
+        <Filename Value="Project1.pas"/>
+        <IsPartOfProject Value="True"/>
+      </Unit>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <PathDelim Value="\"/>
+    <Target>
+      <Filename Value="Project1"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <OtherUnitFiles Value="..\..\source\units"/>
+      <UnitOutputDirectory Value="lib\$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Debugging>
+        <DebugInfoType Value="dsDwarf2Set"/>
+      </Debugging>
+    </Linking>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions>
+      <Item>
+        <Name Value="EAbort"/>
+      </Item>
+      <Item>
+        <Name Value="ECodetoolError"/>
+      </Item>
+      <Item>
+        <Name Value="EFOpenError"/>
+      </Item>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

applications/lazstats/tests/gammaln_test/Project1.pas

@@ -0,0 +1,64 @@
+program Project1;
+
+uses
+  SysUtils,
+  spe,
+  MathUnit;
+
+// Numerical recipes
+function GammaLn(x: double): Double;
+{ gibt den Log der vollständigen Gamma-Funktion zurück (x>0).
+     Gamma(x) = integral ( t^(x-1) * exp(-t) dt ) (von 0 bis Unendlich)
+  (Log, um Floating Point Underflow zu vermeiden). }
+const
+  stp  = 2.50662827465;
+var
+  xx,tmp,ser : extended;
+begin
+  if x<=0 then
+    raise Exception.Create('Argument für GammaLn ist negativ.');
+  if (x > 1) then begin
+    xx  := x  - 1.0;
+    tmp := xx + 5.5;
+    tmp := (xx+0.5) * ln(tmp) - tmp;
+    ser := 1.0 + 76.18009173    /(xx+1.0) - 86.50532033/(xx+2.0)
+               + 24.01409822    /(xx+3.0) - 1.231739516/(xx+4.0)
+               +  0.120858003E-2/(xx+5.0) - 0.536382E-5/(xx+6.0);
+    result := tmp + ln(stp*ser);
+  end else
+  if (x < 1) then
+    result := GammaLn(x+1.0) - ln(x)
+  else
+  if (x=1) then
+    result := 0.0;
+end;
+
+const
+  xmin = 1e-3;
+  xmax = 5.0;
+
+procedure Test;
+var
+  i: Integer;
+  x, y_lazStats, y_numlib, y_numrecip: Double;
+begin
+  WriteLn('x':20, 'y(lazstats)':20, 'y(numlib)':20, 'y(Num.Recipies)':20);
+  x := xmin;
+  while (x <= xmax) do begin
+    y_numlib := 1.0 - spelga(x);
+    y_lazstats := MathUnit.gammaln(x);
+    y_numrecip := gammaln(x);
+
+    WriteLn(x:20:6, y_lazstats:20:5, y_numlib:20:5, y_numrecip:20:5);
+    x := x*1.25
+//    x := x + dx;
+  end;
+end;
+
+begin
+  WriteLn('GammaLn function');
+  WriteLn;
+  Test;
+  ReadLn;
+end.
+