mathfp.html

除了支持一般的小数运算

<HR>

<A NAME="mul(int, int)"><!-- --></A><H3>
mul</H3>
<PRE>
public static int <B>mul</B>(int&nbsp;n,
                      int&nbsp;m)</PRE>
<DL>
<DD>Multiplies two fixed-point integers. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to be multiplied.<DD><CODE>m</CODE> - the fixed-point integer multiplier<DT><B>Returns:</B><DD>an new fixed point integer representing n multiplied by m.<DT><B>Throws:</B><DD><CODE>Nothing</CODE> - but sets err_no flag<DT><B>Since: </B><DD>MathFP 1.0.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="div(int, int)"><!-- --></A><H3>
div</H3>
<PRE>
public static int <B>div</B>(int&nbsp;n,
                      int&nbsp;m)</PRE>
<DL>
<DD>Divides two fixed-point integers. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the dividend fixed-point integer.<DD><CODE>m</CODE> - the divider fixed-point integer.<DT><B>Returns:</B><DD>an new fixed point integer representing n divided by m.<DT><B>Since: </B><DD>MathFP 1.0.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="add(int, int)"><!-- --></A><H3>
add</H3>
<PRE>
public static int <B>add</B>(int&nbsp;n,
                      int&nbsp;m)</PRE>
<DL>
<DD>Adds two fixed-point integers. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to add to.<DD><CODE>m</CODE> - the fixed-point integer to be added.<DT><B>Returns:</B><DD>an new fixed point integer representing the addition of n and m.<DT><B>Since: </B><DD>MathFP 1.0.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="sub(int, int)"><!-- --></A><H3>
sub</H3>
<PRE>
public static int <B>sub</B>(int&nbsp;n,
                      int&nbsp;m)</PRE>
<DL>
<DD>Subtracts two fixed-point integers. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to subtract from.<DD><CODE>m</CODE> - the fixed-point integer to be subtracted.<DT><B>Returns:</B><DD>an new fixed point integer representing the subtraction of n and m.<DT><B>Since: </B><DD>MathFP 1.0.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="abs(int)"><!-- --></A><H3>
abs</H3>
<PRE>
public static int <B>abs</B>(int&nbsp;n)</PRE>
<DL>
<DD>Returns the absolute value of the fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to get the absolute value of.<DT><B>Returns:</B><DD>an new fixed point integer representing the absolute value of n.<DT><B>Since: </B><DD>KVM-DR4.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="sqrt(int, int)"><!-- --></A><H3>
sqrt</H3>
<PRE>
public static int <B>sqrt</B>(int&nbsp;n,
                       int&nbsp;r)</PRE>
<DL>
<DD>Returns the square root of the the fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.
 However the value for r would normally not have to be bigger then 16.
 <p>
 This method uses the Newton method to extract the root.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to extract the root from.<DD><CODE>r</CODE> - an integer that specifies the number of iterations.<DT><B>Returns:</B><DD>the fixed-point integer sqrt of n.<DT><B>Throws:</B><DD><CODE>Nothing</CODE> - but sets err_no flag<DT><B>Since: </B><DD>MathFP 1.1.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="sqrt(int)"><!-- --></A><H3>
sqrt</H3>
<PRE>
public static int <B>sqrt</B>(int&nbsp;n)</PRE>
<DL>
<DD>Returns the square root of the the fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>n</CODE> - the fixed-point integer to extract the root from.<DT><B>Returns:</B><DD>the fixed-point integer sqrt of n.<DT><B>Throws:</B><DD><CODE>Nothing</CODE> - but sets err_no flag<DT><B>Since: </B><DD>MathFP 1.0.1</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="sin(int)"><!-- --></A><H3>
sin</H3>
<PRE>
public static int <B>sin</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the sine of the radian fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>r</CODE> - the radian fixed-point integer to get the sine value of.<DT><B>Returns:</B><DD>the sine for the radian n as a fixed-point integer.<DT><B>Since: </B><DD>MathFP 1.0.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="asin(int)"><!-- --></A><H3>
asin</H3>
<PRE>
public static int <B>asin</B>(int&nbsp;x)</PRE>
<DL>
<DD>Returns the arc sine of the fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - a fixed-point integer to get the arc sine of.<DT><B>Returns:</B><DD>the arc sine of the fixed-point integer s.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the input is < -1 and > 1.<DT><B>Since: </B><DD>MathFP 1.0.3</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="cos(int)"><!-- --></A><H3>
cos</H3>
<PRE>
public static int <B>cos</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the cosine of the radian fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>r</CODE> - the radian fixed-point integer to get the cosine value of.<DT><B>Returns:</B><DD>the cosine for the radian r as a fixed-point integer.<DT><B>Since: </B><DD>MathFP 1.0.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="acos(int)"><!-- --></A><H3>
acos</H3>
<PRE>
public static int <B>acos</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the arc cosine of the fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - a fixed-point integer to get the arc sine of.<DT><B>Returns:</B><DD>the arc sine of the fixed-point integer s.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the input is < -1 and > 1.<DT><B>Since: </B><DD>MathFP 1.0.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="tan(int)"><!-- --></A><H3>
tan</H3>
<PRE>
public static int <B>tan</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the tangent of the radian fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>r</CODE> - the radian fixed-point integer to get the tangent value of.<DT><B>Returns:</B><DD>the tangent of the radian r as a fixed-point integer.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the input is PI/2 or any multplication of it.<DT><B>Since: </B><DD>MathFP 1.0.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="cot(int)"><!-- --></A><H3>
cot</H3>
<PRE>
public static int <B>cot</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the cotangent of the radian fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>r</CODE> - the radian fixed-point integer to get the tangent value of.<DT><B>Returns:</B><DD>the cotangent of the radian r as a fixed-point integer.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the input is 0, PI or any multplication of it.<DT><B>Since: </B><DD>MathFP 1.1.2</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="atan(int)"><!-- --></A><H3>
atan</H3>
<PRE>
public static int <B>atan</B>(int&nbsp;r)</PRE>
<DL>
<DD>Returns the arc tangent of the radian fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>r</CODE> - the radian fixed-point integer to get the tangent value of.<DT><B>Returns:</B><DD>the arc tangent of the radian r as a fixed-point integer.<DT><B>Throws:</B><DD><CODE>ArithmeticException.</CODE> - &nbsp;<DT><B>Since: </B><DD>MathFP 2.0.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="exp(int)"><!-- --></A><H3>
exp</H3>
<PRE>
public static int <B>exp</B>(int&nbsp;x)</PRE>
<DL>
<DD>The natural number raised to the power of a fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>x</CODE> - the fixed-point integer exponent.<DT><B>Returns:</B><DD>the natural number e raised to the power of x.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the function overflows<DT><B>Since: </B><DD>MathFP 1.2.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="log(int)"><!-- --></A><H3>
log</H3>
<PRE>
public static int <B>log</B>(int&nbsp;s)</PRE>
<DL>
<DD>Returns the natural logarithm of a fixed-point integer. 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>s</CODE> - the fixed-point integer to get the logarithm of.<DT><B>Returns:</B><DD>the logarithm of s.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the input is <= 0.<DT><B>Since: </B><DD>MathFP 1.2.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="pow(int, int)"><!-- --></A><H3>
pow</H3>
<PRE>
public static int <B>pow</B>(int&nbsp;b,
                      int&nbsp;e)</PRE>
<DL>
<DD>Returns a fixed-point integer raised to a fixed-point integer 
 <p>
 See net.jscience.math.MathFP for more details.<DD><DL>
<DT><B>Parameters:</B><DD><CODE>b</CODE> - the fixed-point integer base.<DD><CODE>e</CODE> - the fixed-point integer exponent.<DT><B>Returns:</B><DD>the natural number s raised to the power of e.<DT><B>Throws:</B><DD><CODE>ArithmeticException</CODE> - if the function overflows.<DT><B>Since: </B><DD>MathFP 1.2.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="stat()"><!-- --></A><H3>
stat</H3>
<PRE>
public static int <B>stat</B>()</PRE>
<DL>
<DD>Returns the internal overflow value if any 
 <p>
 An err_no equal to 0 means no bad input or overflow.
 A value of 1 means bad input argument
 A value of 2 means overflow detected<DD><DL>
<DT><B>Returns:</B><DD>the internal overflow or bad input detector.<DT><B>Since: </B><DD>MathFP 1.2.0</DD>
</DL>
</DD>
</DL>
<HR>

<A NAME="atan2(int, int)"><!-- --></A><H3>
atan2</H3>
<PRE>
public static int <B>atan2</B>(int&nbsp;y,
                        int&nbsp;x)</PRE>
<DL>
<DD>Returns the pricipal value of the arc tangent of y/x
 <p>
 Compute the principal value of the arc tangent of y/x, using the signs of both parameters
 to determine the quadrant of the return value
 or inother words computes elementwise the angle in radian between the positive part of
 the x-axis and the line with origin in (0,0) which contains the point (x, y).<DD><DL>
<DT><B>Parameters:</B><DD><CODE>y</CODE> - the fixed-point integer<DD><CODE>x</CODE> - the fixed-point integer<DT><B>Returns:</B><DD>the pricipal value of the arctangent y/x<DT><B>Since: </B><DD>MathFP2.0.5</DD>
</DL>
</DD>
</DL>
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