1 | ### arccosh =====================================================================
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2 |
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3 | Tags
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4 | ----
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5 | scripting, JS, internal, treenode, general concept
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6 |
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7 | Parameters
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8 | ----------
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9 | x
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10 |
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11 | General description
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12 | -------------------
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13 | Returns the inverse hyperbolic cosine of x.
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14 |
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15 | ###
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16 |
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17 | Eval_arccosh = ->
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18 | push(cadr(p1))
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19 | Eval()
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20 | arccosh()
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21 |
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22 | arccosh = ->
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23 | d = 0.0
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24 | save()
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25 | p1 = pop()
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26 | if (car(p1) == symbol(COSH))
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27 | push(cadr(p1))
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28 | restore()
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29 | return
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30 |
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31 | if (isdouble(p1))
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32 | d = p1.d
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33 | if (d < 1.0)
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34 | stop("arccosh function argument is less than 1.0")
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35 | d = Math.log(d + Math.sqrt(d * d - 1.0))
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36 | push_double(d)
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37 | restore()
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38 | return
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39 |
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40 | if (isplusone(p1))
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41 | push(zero)
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42 | restore()
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43 | return
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44 |
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45 | push_symbol(ARCCOSH)
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46 | push(p1)
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47 | list(2)
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48 | restore()
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49 |
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50 |
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