svn-gvsig-desktop / trunk / org.gvsig.desktop / org.gvsig.desktop.library / org.gvsig.expressionevaluator / org.gvsig.expressionevaluator.lib / org.gvsig.expressionevaluator.lib.impl / src / main / java / org / gvsig / expressionevaluator / impl / function / numeric / ATanFunction.java @ 43983
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1 | 43512 | jjdelcerro | package org.gvsig.expressionevaluator.impl.function.numeric; |
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2 | |||
3 | import org.apache.commons.lang3.Range; |
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4 | 43521 | jjdelcerro | import org.gvsig.expressionevaluator.Interpreter; |
5 | 43512 | jjdelcerro | import org.gvsig.expressionevaluator.spi.AbstractFunction; |
6 | |||
7 | public class ATanFunction extends AbstractFunction { |
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8 | |||
9 | public ATanFunction() {
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10 | 43983 | jjdelcerro | super("Numeric", "ATAN", Range.is(1), |
11 | "Returns the arc tangent of a value; the returned angle is in the range -pi/2 through pi/2. Special cases:\n" +
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12 | "- If the argument is NaN, then the result is NaN.\n" +
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13 | "- If the argument is zero, then the result is a zero with the same sign as the argument.\n" +
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14 | "The computed result must be within 1 ulp of the exact result. Results must be semi-monotonic.\n",
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15 | "ATAN({{a}})",
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16 | new String[]{ |
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17 | "a - the value whose arc tangent is to be returned."
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18 | }, |
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19 | "Double"
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20 | ); |
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21 | 43512 | jjdelcerro | } |
22 | |||
23 | @Override
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24 | 43521 | jjdelcerro | public Object call(Interpreter interpreter, Object[] args) { |
25 | 43512 | jjdelcerro | double r = Math.atan(getDouble(args, 0)); |
26 | return r;
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27 | } |
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28 | |||
29 | } |