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58 lines
1.4 KiB
58 lines
1.4 KiB
3 years ago
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#!/usr/bin/python
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import operator
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def new_rap(x, func: str="0", der: str="0", iter=0):
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y_exper = func.replace("x", str(x))
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der_exper = der.replace("x", str(x))
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y = eval(y_exper)
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der = eval(der_exper)
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print(f"new_x = {x} - {y}/{der} [{iter}]")
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new_x = x - (y / der)
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return new_x
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# def new_rap(x, func=nullfunc, dx=0.1):
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# new_x = None
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# try:
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# while x != new_x:
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# y = func(x)
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# der = derive(x, func, dx)
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# new_x = x - y/der
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# if new_x == x:
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# return new_x
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# else:
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# x = new_x
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# return x
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# except ZeroDivisionError as error:
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# print(f"{y=} {der=} {new_x=}")
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# print(error)
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def eval_func( func: str, x: float ):
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y_exper = func.replace("x", str(x))
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return eval(y_exper)
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def new_rap_method(x, funcstr: str="0", derstr: str="0", per=10):
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new_x = None
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i = 0
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while True:
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y = eval_func(funcstr, x)
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der = eval_func(derstr, x)
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print(f"new_x = {x} - {y}/{der} [{i}]")
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new_x = x - (y / der)
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i += 1
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if round(eval_func(funcstr, new_x), per) == 0:
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return round(new_x, per)
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else:
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x = new_x
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if __name__ == "__main__":
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func = input("f(x) = ")
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der = input("f'(x) = ")
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randx = float(input("x = "))
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print("Doing newton-raphsons method to get root...")
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x = new_rap_method(randx, func, der)
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print(f"{x=}")
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