用Octave计算不定式极限（4）
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其他不定式（1） \(0\cdot \infty \)型
计算\( \displaystyle\lim_{x \to -\infty } x \cdot \left ( { \rm arctan} x+ \frac{\pi}{2} \right ) \)
程序代码如下
function [text_result, numeric_result] = func10(x_value)
    pkg load symbolic;
    x = sym('x');
    unit_1 = atan(x);
    unit_2 = pi/2;
    question = x * (unit_1 + unit_2);
    lim = limit(question, x, x_value);
    text_result = ["\n", disp(lim)];
    numeric_result = eval(lim);
endfunction
令\(x \to -\infty \)，计算结果如下
>> [text_result, numeric_result] = func10(-inf)
warning: passing floating-point values to sym is dangerous, see "help sym"
warning: called from
    double_to_sym_heuristic at line 50 column 7
    sym at line 384 column 13
    plus at line 53 column 5
    func10 at line 6 column 14

text_result =
    -1

numeric_result = -1
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