python - Possible bug in Sympy library working with imaginary numbers when there are not any -


I tried to do the regula falsi method in Python using the Simpi library, though I There are some functions found that an issue is telling me that I am working with fictitious numbers.

This is my code: 

  DIF reagla falsa (Fx, P, P1, millennium, Iteracy Maxima): Fx = S (Fx) I = 2 q0 = Fx (X, p0) q1 = fx.subs (x, p1) while i & lt; = IteracionesMaximas: p = p1 - q1 * (p1-p0) / (q1-q0) if full (p-p1) & lt; Tolerance: Return p q = fx.subs (x, p) if (q ** q1) & lt; 0: p0 = p q0 = q other: p1 = p q1 = qi + = 1 return p

I called it with the following arguments:

Fx = 3 * x + sin (x) -2.71828182846 ** x, pO = 0.0, p1 = 2.0, millennium = .0001, iTreasinemaximus = 15

and

< P> fx = 2 * x ** 2 + x-1, po = 0.0, p1 = 1.0, tolerancia = .0001, iteracionesMaximas = 15

Sin ( X) As argument, I get NaN on some variables

I am using the following traceback: 

  Traceback (Most recent call final): File "../Prakcticas/python/ReglaFalsa.py", type Finance 16, & lt; Module & gt; Print json.dumps (reglafalsa (y, a, b, tolerancia, iteraciones maximas), indent = 1) file "/home/diegoaguilar/Copy/buap/Métodos/Prakcticas/python/reglafalsa.py", line 45, in Regal Falsa if (Q ** q1) & lt; 0: file "/usr/local/lib/python2.7/dist-packages/sympy/core/decorators.py", in line 77, __sympifyit_wrapper return func (A, B) file "/ usr / local / lib / python2 Type__rty__ (Comparative comparison of "complex% s"% dif) TypeError: Compared 0.0114119631147945 - 0.179219618952309 * Invalid comparison compared to .7 / dist-packages / sympy / core / expr.py ", line 248, / change exponentiation (leading to complex results)  
  q  
  
 
 
 
 to multiply 
 
  q * q1 & lt; 0:  
 
 Or find another way to compare signals, for example, is the signbite function.

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