# -*- tcl -*-
# Tests for special functions in math library  -*- tcl -*-
#
# This file contains a collection of tests for one or more of the Tcllib
# procedures.  Sourcing this file into Tcl runs the tests and
# generates output for errors.  No output means no errors were found.
#
# $Id: special.test,v 1.13 2007/08/21 17:33:00 andreas_kupries Exp $
#
# Copyright (c) 2004 by Arjen Markus
# All rights reserved.
#

# -------------------------------------------------------------------------

source [file join \
	[file dirname [file dirname [file join [pwd] [info script]]]] \
	devtools testutilities.tcl]

testsNeedTcl     8.4;# statistics,linalg!
testsNeedTcltest 2.1

support {
    useLocal math.tcl        math
    useLocal constants.tcl   math::constants
    useLocal linalg.tcl      math::linearalgebra
    useLocal statistics.tcl  math::statistics
    useLocal polynomials.tcl math::polynomials
}
testing {
    useLocal special.tcl math::special
}

# -------------------------------------------------------------------------

#
# Expect an accuracy of at least four decimals
#
proc matchNumbers {expected actual} {
    set match 1
    foreach a $actual e $expected {
        if {abs($a-$e) > 1.0e-4} {
            set match 0
            break
        }
    }
    return $match
}

#
# Expect an accuracy of some three decimals (Fresnel)
#
proc matchFresnel {expected actual} {
    set match 1
    foreach a $actual e $expected {
        if {abs($a-$e) > 2.0e-3} {
            set match 0
            break
        }
    }
    return $match
}

customMatch numbers         matchNumbers
customMatch numbers-fresnel matchFresnel

test "Erf-1.0" "Values of the error function" \
    -match numbers -body {
    set result {}
    foreach x {0.0 0.1 0.2 0.5 1.0 2.0 -0.1 -0.2 -0.5 -1.0 -2.0} {
        lappend result [::math::special::erf $x]
    }
    set result
} -result {0.0  0.1124629  0.2227026  0.5204999  0.8427008  0.9953227
               -0.1124629 -0.2227026 -0.5204999 -0.8427008 -0.9953227}

proc make_erfc {erf_values} {
    set result {}
    foreach v $erf_values {
        lappend result [expr {1.0-$v}]
    }
    return $result
}

test "Erf-1.1" "Values of the complementary error function" \
    -match numbers -body {
    set result {}
    foreach x {0.0 0.1 0.2 0.5 1.0 2.0 -0.1 -0.2 -0.5 -1.0 -2.0} {
        lappend result [::math::special::erfc $x]
    }
    set result
} -result [make_erfc {0.0  0.1124629  0.2227026  0.5204999  0.8427008 0.9953227
                          -0.1124629 -0.2227026 -0.5204999 -0.8427008 -0.9953227}]


test "Fresnel-1.0" "Values of the Fresnel C intergral" \
   -match numbers-fresnel -body {
   set result {}
   foreach x {0.0 0.1 0.2 0.5 1.0 1.5 2.0 3.0 4.0 5.0} {
      lappend result [::math::special::fresnel_C $x]
   }
   set result
} -result {0.0  0.09999 0.19992 0.49234 0.77989 0.44526
           0.48825 0.60572 0.49842 0.56363}

test "Fresnel-1.1" "Values of the Fresnel S intergral" \
   -match numbers-fresnel -body {
   set result {}
   foreach x {0.0 0.1 0.2 0.5 1.0 1.5 2.0 3.0 4.0 5.0} {
      lappend result [::math::special::fresnel_S $x]
   }
   set result
} -result {0.0  0.00052 0.00419 0.06473 0.43826 0.69750
           0.34342 0.49631 0.42052 0.49919}

# No tests for sinc yet

# End of test cases
testsuiteCleanup