如何从多项式表达式中得出系数? [英] how to get the coefficients out of the polynomal expression?

问题描述

在输入处，我得到一个多项式作为字符串， 我想获取变量中的系数，但我不知道该怎么做. 例如:7x^4+3x^3-6x^2+x-8.最大度未知，系数是整数. 我将非常感谢您的帮助.

At the input I get a polynomial as a string, I want to get its coefficients in variables, but i have no idea gow do this. example:7x^4+3x^3-6x^2+x-8.Maximum degree is not known, coefficients are integers. I will be very grateful for any help.

推荐答案

用加号和减号(例如，用 re.split )，将结果中的符号保留下来.然后，对于每个子字符串，用"x"除以得到前导系数(+1和-1是特殊情况)，并记下x的次幂(即系数0).

Split by plus and minus (e.g. with re.split), preserving the signs in the results. Then for each substring, split by "x" to get the leading coefficient (+1 and -1 are special cases), and take note of missing powers of x (i.e. coefficient 0).

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