使用优化模块的Scipy错误.无法将数组转换为fortran [英] Scipy error using optimization module. Failure converting array to fortran
问题描述
尝试使用scipy的优化模块来查找使用slsqp的功能的最小值,而我遇到了一些问题.调用该函数的实际代码如下所示:
Trying to use scipy's optimize module to find the minimum of a function using slsqp and I'm running into some issues. The actual code calling the function is shown below:
def minimizeWebEnergyLost(x, parameters):
"""values = [theta, velocity]"""
firstTerm = lambda values: (x * values[1]**2 / 2.0)
sqrtTerm = lambda values: np.sqrt((parameters.gravity**2 * x**2) / (4 * values[1]**4 * np.cos(values[0])**4) + 1)
secondTerm = lambda values: (values[1]**4 * np.cos(values[0])**2) / parameters.gravity
arcsinhTerm = lambda values: np.arcsinh((parameters.gravity * x) / (2 * values[1]**2 * np.cos(values[0])**2))
costFunction = lambda values: firstTerm(values)*sqrtTerm(values)+secondTerm(values)*arcsinhTerm(values)
bounds = ((-math.pi/2,math.pi/2),(0,parameters.maxSlingSpeed))
minimum = minimize(costFunction, (pi/4, 20), method="SLSQP", bounds=bounds)
return minimum
由于某种原因,我得到的错误如下:
For some reason the error I'm getting is as follows:
_slsqp.error: failed in converting 8th argument `g' of _slsqp.slsqp to C/Fortran array
不太确定这里发生了什么,但是我可以提出更多可能有用的代码.
Not quite sure what's going on hre, but I can put up any more code that might be useful if it helps.
推荐答案
当用户指定的目标函数未返回标量时,将发生此错误.现在, b-carter
This cryptic error occurs when the user specified objective function does not returning a scalar. A clear error message is now returned in a patch by b-carter,
"Objective function must return a scalar"
并且文档已更新,请参见此线程进行讨论.
and the documentation is updated, see this thread for discussion.
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