在PsychoPy v1.85.1中,我正在配置'多边形'刺激对象。我试图通过csv条件文件设置height属性。我收到一条错误消息“无效参数。不接受单个号码”
Windows上的PsychoPy v1.85.1。
在多边形的弹出式UI'尺寸'框中输入: $ height
在csv文件中,我有一个'height'列。每行都有如下值: (1.5,0)
PsychoPy给出错误信息:
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy \visual\basevisual.py", line 1312, in pos
self.__dict__['pos'] = val2array(value, False, False)
File "C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy\tools\arraytools.py", line 176, in val2array
raise ValueError(msg % str(length))
ValueError: Invalid parameter. Single numbers are not accepted. Should be tuple/list/array of length 2
我转到arraytools.py文件并找到相关的代码段。我将它粘贴到Python笔记本中(尽管它是python 3.3)并添加一些打印行以进行调试:
# Copied code snippet from
# C:\Program Files (x86)\PsychoPy2\lib\site-packages\psychopy\tools\arraytools.py
import numpy
def val2array(value, withNone=True, withScalar=True, length=2):
"""Helper function: converts different input to a numpy array.
Raises informative error messages if input is invalid.
withNone: True/False. should 'None' be passed?
withScalar: True/False. is a scalar an accepted input?
Will be converted to array of this scalar
length: False / 2 / 3. Number of elements input should have or be
converted to. Might be False (do not accept arrays or convert to such)
"""
if value is None:
if withNone:
return None
else:
raise ValueError('Invalid parameter. None is not accepted as '
'value.')
value = numpy.array(value, float)
print ("value:", value) #I ADDED
print ("value.shape:", value.shape) #I ADDED
print ("numpy.product(value.shape):", numpy.product(value.shape)) #I ADDED
if numpy.product(value.shape) == 1: #MY COMMENT: WHY DOES THIS EVALUTE TRUE?
if withScalar:
# e.g. 5 becomes array([5.0, 5.0, 5.0]) for length=3
return numpy.repeat(value, length)
else:
msg = ('Invalid parameter. Single numbers are not accepted. '
'Should be tuple/list/array of length %s')
raise ValueError(msg % str(length))
elif value.shape[-1] == length:
return numpy.array(value, float)
else:
msg = 'Invalid parameter. Should be length %s but got length %s.'
raise ValueError(msg % (str(length), str(len(value))))
我通过输入值来测试它,然后运行该函数。
# Run the function
value = (1.5,0.0)
val2array(value, False, False, length =2)
以下结果。似乎工作正常:
value: [ 1.5 0. ]
value.shape: (2,)
numpy.product(value.shape): 2
Out: array([ 1.5, 0. ])
print "position: ", position
print "type(position): ", type(position)
print "numpy.array(position, float): ", np.array(position, float)
#Results:
position: (0, 0.5)
type(position): <type 'unicode'>
numpy.array(position, float):
Traceback (most recent call last):
File "C:\Users\nikla\Documents\PsychoPy\test2.py", line 127, in <module>
print "numpy.array(position, float): ", np.array(position, float)
ValueError: could not convert string to float: (0, 0.5)
知道我做错了吗?
答案 0 :(得分:1)
通过使用方括号输入属性值(在GUI弹出窗口中)修复了问题:
[1.5,0]
答案 1 :(得分:0)
错误与position属性有关,而不是高度。你将这个位置设置为标量吗?它必须是一个坐标。尝试将您的csv文件中的位置写为(1.5, 0.0)
,然后在Builder中输入$eval(position)
(或称为位置列的任何内容)。