Math.Tanh メソッド
アセンブリ: mscorlib (mscorlib.dll 内)

Dim value As Double Dim returnValue As Double returnValue = Math.Tanh(value)
戻り値
value のハイパーボリック タンジェント。value が NegativeInfinity に等しい場合、このメソッドは -1 を返します。value が PositiveInfinity に等しい場合、このメソッドは 1 を返します。value が NaN に等しい場合、このメソッドは NaN を返します。


次に示すのは、Tanh を使用して、選択した値からハイパーボリック タンジェント恒等式を求める例です。
' Example for the hyperbolic Math.Tanh( Double ) method. Imports System Imports Microsoft.VisualBasic Module DemoTanh Sub Main() Console.WriteLine( _ "This example of hyperbolic Math.Tanh( Double )" & _ vbCrLf & "generates the following output.") Console.WriteLine( _ vbCrLf & "Evaluate these hyperbolic " & _ "identities with selected values for X:") Console.WriteLine(" tanh(X) = sinh(X) / cosh(X)") Console.WriteLine(" tanh(2 * X) = 2 * tanh(X) / (1 + tanh^2(X))") UseTanh(0.1) UseTanh(1.2) UseTanh(4.9) Console.WriteLine( _ vbCrLf & "Evaluate [tanh(X + Y) == (tanh(X) + " & _ "tanh(Y)) / (1 + tanh(X) * tanh(Y))]" & _ vbCrLf & "with selected values for X and Y:") UseTwoArgs(0.1, 1.2) UseTwoArgs(1.2, 4.9) End Sub 'Main ' Evaluate hyperbolic identities with a given argument. Sub UseTanh(arg As Double) Dim tanhArg As Double = Math.Tanh(arg) ' Evaluate tanh(X) = sinh(X) / cosh(X). Console.WriteLine( _ vbCrLf & " Math.Tanh({0}) = {1:E16}" & _ vbCrLf & " Math.Sinh({0}) / Math.Cosh({0}) = {2:E16}", _ arg, tanhArg, Math.Sinh(arg) / Math.Cosh(arg)) ' Evaluate tanh(2 * X) = 2 * tanh(X) / (1 + tanh^2(X)). Console.WriteLine( _ " 2 * Math.Tanh({0}) /", _ arg, 2.0 * tanhArg) Console.WriteLine( _ " (1 + (Math.Tanh({0}))^2) = {1:E16}", _ arg, 2.0 * tanhArg /(1.0 + tanhArg * tanhArg)) Console.WriteLine( _ " Math.Tanh({0}) = {1:E16}", _ 2.0 * arg, Math.Tanh((2.0 * arg))) End Sub 'UseTanh ' Evaluate a hyperbolic identity that is a function of two arguments. Sub UseTwoArgs(argX As Double, argY As Double) ' Evaluate tanh(X + Y) = (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y)). Console.WriteLine( _ vbCrLf & " (Math.Tanh({0}) + Math.Tanh({1})) /" & _ vbCrLf & "(1 + Math.Tanh({0}) * Math.Tanh({1})) = {2:E16}", _ argX, argY, (Math.Tanh(argX) + Math.Tanh(argY)) / _ (1.0 + Math.Tanh(argX) * Math.Tanh(argY))) Console.WriteLine( _ " Math.Tanh({0}) = {1:E16}", _ argX + argY, Math.Tanh(argX + argY)) End Sub 'UseTwoArgs End Module 'DemoTanh ' This example of hyperbolic Math.Tanh( Double ) ' generates the following output. ' ' Evaluate these hyperbolic identities with selected values for X: ' tanh(X) = sinh(X) / cosh(X) ' tanh(2 * X) = 2 * tanh(X) / (1 + tanh^2(X)) ' ' Math.Tanh(0.1) = 9.9667994624955819E-002 ' Math.Sinh(0.1) / Math.Cosh(0.1) = 9.9667994624955819E-002 ' 2 * Math.Tanh(0.1) / ' (1 + (Math.Tanh(0.1))^2) = 1.9737532022490401E-001 ' Math.Tanh(0.2) = 1.9737532022490401E-001 ' ' Math.Tanh(1.2) = 8.3365460701215521E-001 ' Math.Sinh(1.2) / Math.Cosh(1.2) = 8.3365460701215521E-001 ' 2 * Math.Tanh(1.2) / ' (1 + (Math.Tanh(1.2))^2) = 9.8367485769368024E-001 ' Math.Tanh(2.4) = 9.8367485769368024E-001 ' ' Math.Tanh(4.9) = 9.9988910295055444E-001 ' Math.Sinh(4.9) / Math.Cosh(4.9) = 9.9988910295055433E-001 ' 2 * Math.Tanh(4.9) / ' (1 + (Math.Tanh(4.9))^2) = 9.9999999385024030E-001 ' Math.Tanh(9.8) = 9.9999999385024030E-001 ' ' Evaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y))] ' with selected values for X and Y: ' ' (Math.Tanh(0.1) + Math.Tanh(1.2)) / ' (1 + Math.Tanh(0.1) * Math.Tanh(1.2)) = 8.6172315931330645E-001 ' Math.Tanh(1.3) = 8.6172315931330634E-001 ' ' (Math.Tanh(1.2) + Math.Tanh(4.9)) / ' (1 + Math.Tanh(1.2) * Math.Tanh(4.9)) = 9.9998993913939649E-001 ' Math.Tanh(6.1) = 9.9998993913939649E-001
// Example for the hyperbolic Math.Tanh( double ) method. using System; class DemoTanh { public static void Main() { Console.WriteLine( "This example of hyperbolic Math.Tanh( double )\n" + "generates the following output." ); Console.WriteLine( "\nEvaluate these hyperbolic identities " + "with selected values for X:" ); Console.WriteLine( " tanh(X) == sinh(X) / cosh(X)" ); Console.WriteLine( " tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X))" ); UseTanh(0.1); UseTanh(1.2); UseTanh(4.9); Console.WriteLine( "\nEvaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) " + "/ (1 + tanh(X) * tanh(Y))]" + "\nwith selected values for X and Y:" ); UseTwoArgs(0.1, 1.2); UseTwoArgs(1.2, 4.9); } // Evaluate hyperbolic identities with a given argument. static void UseTanh(double arg) { double tanhArg = Math.Tanh(arg); // Evaluate tanh(X) == sinh(X) / cosh(X). Console.WriteLine( "\n Math.Tanh({0}) == {1:E16}\n" + " Math.Sinh({0}) / Math.Cosh({0}) == {2:E16}", arg, tanhArg, (Math.Sinh(arg) / Math.Cosh(arg)) ); // Evaluate tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)). Console.WriteLine( " 2 * Math.Tanh({0}) /", arg, 2.0 * tanhArg ); Console.WriteLine( " (1 + (Math.Tanh({0}))^2) == {1:E16}", arg, 2.0 * tanhArg / (1.0 + tanhArg * tanhArg ) ); Console.WriteLine( " Math.Tanh({0}) == {1:E16}", 2.0 * arg, Math.Tanh(2.0 * arg) ); } // Evaluate a hyperbolic identity that is a function of two arguments. static void UseTwoArgs(double argX, double argY) { // Evaluate tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y)). Console.WriteLine( "\n (Math.Tanh({0}) + Math.Tanh({1})) /\n" + "(1 + Math.Tanh({0}) * Math.Tanh({1})) == {2:E16}", argX, argY, (Math.Tanh(argX) + Math.Tanh(argY)) / (1.0 + Math.Tanh(argX) * Math.Tanh(argY)) ); Console.WriteLine( " Math.Tanh({0}) == {1:E16}", argX + argY, Math.Tanh(argX + argY)); } } /* This example of hyperbolic Math.Tanh( double ) generates the following output. Evaluate these hyperbolic identities with selected values for X: tanh(X) == sinh(X) / cosh(X) tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)) Math.Tanh(0.1) == 9.9667994624955819E-002 Math.Sinh(0.1) / Math.Cosh(0.1) == 9.9667994624955819E-002 2 * Math.Tanh(0.1) / (1 + (Math.Tanh(0.1))^2) == 1.9737532022490401E-001 Math.Tanh(0.2) == 1.9737532022490401E-001 Math.Tanh(1.2) == 8.3365460701215521E-001 Math.Sinh(1.2) / Math.Cosh(1.2) == 8.3365460701215521E-001 2 * Math.Tanh(1.2) / (1 + (Math.Tanh(1.2))^2) == 9.8367485769368024E-001 Math.Tanh(2.4) == 9.8367485769368024E-001 Math.Tanh(4.9) == 9.9988910295055444E-001 Math.Sinh(4.9) / Math.Cosh(4.9) == 9.9988910295055433E-001 2 * Math.Tanh(4.9) / (1 + (Math.Tanh(4.9))^2) == 9.9999999385024030E-001 Math.Tanh(9.8) == 9.9999999385024030E-001 Evaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y))] with selected values for X and Y: (Math.Tanh(0.1) + Math.Tanh(1.2)) / (1 + Math.Tanh(0.1) * Math.Tanh(1.2)) == 8.6172315931330645E-001 Math.Tanh(1.3) == 8.6172315931330634E-001 (Math.Tanh(1.2) + Math.Tanh(4.9)) / (1 + Math.Tanh(1.2) * Math.Tanh(4.9)) == 9.9998993913939649E-001 Math.Tanh(6.1) == 9.9998993913939649E-001 */
// Example for the hyperbolic Math::Tanh( double ) method. using namespace System; // Evaluate hyperbolic identities with a given argument. void UseTanh( double arg ) { double tanhArg = Math::Tanh( arg ); // Evaluate tanh(X) == sinh(X) / cosh(X). Console::WriteLine( "\n Math::Tanh({0}) == {1:E16}\n" " Math::Sinh({0}) / Math::Cosh({0}) == {2:E16}", arg, tanhArg, (Math::Sinh( arg ) / Math::Cosh( arg )) ); // Evaluate tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)). Console::WriteLine( " 2 * Math::Tanh({0}) /", arg, 2.0 * tanhArg ); Console::WriteLine( " (1 + (Math::Tanh({0}))^2) == {1:E16}", arg, 2.0 * tanhArg / (1.0 + tanhArg * tanhArg) ); Console::WriteLine( " Math::Tanh({0}) == {1:E16}", 2.0 * arg, Math::Tanh( 2.0 * arg ) ); } // Evaluate a hyperbolic identity that is a function of two arguments. void UseTwoArgs( double argX, double argY ) { // Evaluate tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y)). Console::WriteLine( "\n (Math::Tanh({0}) + Math::Tanh({1})) /\n" "(1 + Math::Tanh({0}) * Math::Tanh({1})) == {2:E16}", argX, argY, (Math::Tanh( argX ) + Math::Tanh( argY )) / (1.0 + Math::Tanh( argX ) * Math::Tanh( argY )) ); Console::WriteLine( " Math::Tanh({0}) == {1:E16}", argX + argY, Math::Tanh( argX + argY ) ); } int main() { Console::WriteLine( "This example of hyperbolic Math::Tanh( double )\n" "generates the following output." ); Console::WriteLine( "\nEvaluate these hyperbolic identities " "with selected values for X:" ); Console::WriteLine( " tanh(X) == sinh(X) / cosh(X)" ); Console::WriteLine( " tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X))" ); UseTanh( 0.1 ); UseTanh( 1.2 ); UseTanh( 4.9 ); Console::WriteLine( "\nEvaluate [tanh(X + Y) == " "(tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y))]" "\nwith selected values for X and Y:" ); UseTwoArgs( 0.1, 1.2 ); UseTwoArgs( 1.2, 4.9 ); } /* This example of hyperbolic Math::Tanh( double ) generates the following output. Evaluate these hyperbolic identities with selected values for X: tanh(X) == sinh(X) / cosh(X) tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)) Math::Tanh(0.1) == 9.9667994624955819E-002 Math::Sinh(0.1) / Math::Cosh(0.1) == 9.9667994624955819E-002 2 * Math::Tanh(0.1) / (1 + (Math::Tanh(0.1))^2) == 1.9737532022490401E-001 Math::Tanh(0.2) == 1.9737532022490401E-001 Math::Tanh(1.2) == 8.3365460701215521E-001 Math::Sinh(1.2) / Math::Cosh(1.2) == 8.3365460701215521E-001 2 * Math::Tanh(1.2) / (1 + (Math::Tanh(1.2))^2) == 9.8367485769368024E-001 Math::Tanh(2.4) == 9.8367485769368024E-001 Math::Tanh(4.9) == 9.9988910295055444E-001 Math::Sinh(4.9) / Math::Cosh(4.9) == 9.9988910295055433E-001 2 * Math::Tanh(4.9) / (1 + (Math::Tanh(4.9))^2) == 9.9999999385024030E-001 Math::Tanh(9.8) == 9.9999999385024030E-001 Evaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y))] with selected values for X and Y: (Math::Tanh(0.1) + Math::Tanh(1.2)) / (1 + Math::Tanh(0.1) * Math::Tanh(1.2)) == 8.6172315931330645E-001 Math::Tanh(1.3) == 8.6172315931330634E-001 (Math::Tanh(1.2) + Math::Tanh(4.9)) / (1 + Math::Tanh(1.2) * Math::Tanh(4.9)) == 9.9998993913939649E-001 Math::Tanh(6.1) == 9.9998993913939649E-001 */
// Example for the hyperbolic Math.Tanh( double ) method. import System.*; class DemoTanh { public static void main(String[] args) { Console.WriteLine(("This example of hyperbolic Math.Tanh( double )\n" + "generates the following output.")); Console.WriteLine( ("\nEvaluate these hyperbolic identities " + "with selected values for X:")); Console.WriteLine(" tanh(X) == sinh(X) / cosh(X)"); Console.WriteLine(" tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X))"); UseTanh(0.1); UseTanh(1.2); UseTanh(4.9); Console.WriteLine( ("\nEvaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) " + "/ (1 + tanh(X) * tanh(Y))]" + "\nwith selected values for X and Y:")); UseTwoArgs(0.1, 1.2); UseTwoArgs(1.2, 4.9); } //main // Evaluate hyperbolic identities with a given argument. static void UseTanh(double arg) { double tanhArg = System.Math.Tanh(arg); // Evaluate tanh(X) == sinh(X) / cosh(X). Console.WriteLine( "\n Math.Tanh({0}) == {1}\n" + " Math.Sinh({0}) / Math.Cosh({0}) == {2}", System.Convert.ToString(arg), ((System.Double)(tanhArg)).ToString("E16"), ((System.Double)(System.Math.Sinh(arg) / System.Math.Cosh(arg))).ToString("E16")); // Evaluate tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)). Console.WriteLine( " 2 * Math.Tanh({0}) /", System.Convert.ToString(arg), ((System.Double)(2.0 * tanhArg)).ToString("E16")); Console.WriteLine( " (1 + (Math.Tanh({0}))^2) == {1}", System.Convert.ToString(arg),((System.Double)( 2.0 * tanhArg / (1.0 + tanhArg * tanhArg))).ToString("E16")); Console.WriteLine( " Math.Tanh({0}) == {1}", System.Convert.ToString(2.0 * arg), ((System.Double)( System.Math.Tanh((2.0 * arg)))).ToString("E16")); } //UseTanh // Evaluate a hyperbolic identity that is a function of two arguments. static void UseTwoArgs(double argX, double argY) { // Evaluate tanh(X + Y) == // (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y)). Console.WriteLine( "\n (Math.Tanh({0}) + Math.Tanh({1})) /\n" + "(1 + Math.Tanh({0}) * Math.Tanh({1})) == {2}", System.Convert.ToString(argX), System.Convert.ToString(argY), ((System.Double) ((System.Math.Tanh(argX) + System.Math.Tanh(argY)) / (1.0 + System.Math.Tanh(argX) * System.Math.Tanh(argY)))).ToString("E16")); Console.WriteLine( " Math.Tanh({0}) == {1}", System.Convert.ToString (argX + argY),((System.Double)( System.Math.Tanh((argX + argY)))).ToString("E16")); } //UseTwoArgs } //DemoTanh /* This example of hyperbolic Math.Tanh( double ) generates the following output. Evaluate these hyperbolic identities with selected values for X: tanh(X) == sinh(X) / cosh(X) tanh(2 * X) == 2 * tanh(X) / (1 + tanh^2(X)) Math.Tanh(0.1) == 9.9667994624955819E-002 Math.Sinh(0.1) / Math.Cosh(0.1) == 9.9667994624955819E-002 2 * Math.Tanh(0.1) / (1 + (Math.Tanh(0.1))^2) == 1.9737532022490401E-001 Math.Tanh(0.2) == 1.9737532022490401E-001 Math.Tanh(1.2) == 8.3365460701215521E-001 Math.Sinh(1.2) / Math.Cosh(1.2) == 8.3365460701215521E-001 2 * Math.Tanh(1.2) / (1 + (Math.Tanh(1.2))^2) == 9.8367485769368024E-001 Math.Tanh(2.4) == 9.8367485769368024E-001 Math.Tanh(4.9) == 9.9988910295055444E-001 Math.Sinh(4.9) / Math.Cosh(4.9) == 9.9988910295055433E-001 2 * Math.Tanh(4.9) / (1 + (Math.Tanh(4.9))^2) == 9.9999999385024030E-001 Math.Tanh(9.8) == 9.9999999385024030E-001 Evaluate [tanh(X + Y) == (tanh(X) + tanh(Y)) / (1 + tanh(X) * tanh(Y))] with selected values for X and Y: (Math.Tanh(0.1) + Math.Tanh(1.2)) / (1 + Math.Tanh(0.1) * Math.Tanh(1.2)) == 8.6172315931330645E-001 Math.Tanh(1.3) == 8.6172315931330634E-001 (Math.Tanh(1.2) + Math.Tanh(4.9)) / (1 + Math.Tanh(1.2) * Math.Tanh(4.9)) == 9.9998993913939649E-001 Math.Tanh(6.1) == 9.9998993913939649E-001 */

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