Python 巨蟒:“;使用a.any()或a.all();在穿越一个小村庄的时候
在像这样的Python 巨蟒:“;使用a.any()或a.all();在穿越一个小村庄的时候,python,numpy,for-loop,ambiguity,Python,Numpy,For Loop,Ambiguity,在像这样的numpy.ndarray中: myarray= array([[ 0.47174344, 0.45314669, 0.46395022, 0.47440382, 0.50709627, 0.53350065, 0.5233444 , 0.49974663, 0.48721607, 0.46239652, 0.4693633 , 0.47263569, 0.47591957, 0.436558 , 0.43335574,
numpy.ndarray
中:
myarray=
array([[ 0.47174344, 0.45314669, 0.46395022, 0.47440382, 0.50709627,
0.53350065, 0.5233444 , 0.49974663, 0.48721607, 0.46239652,
0.4693633 , 0.47263569, 0.47591957, 0.436558 , 0.43335574,
0.44053621, 0.42814804, 0.43201894, 0.43973886, 0.44125302,
0.41176999],
[ 0.46509004, 0.46221505, 0.48824086, 0.50088744, 0.53040384,
0.53592231, 0.49710228, 0.49821022, 0.47720381, 0.49096272,
0.50438366, 0.47173162, 0.48813669, 0.45032002, 0.44776794,
0.43910269, 0.43326132, 0.42064458, 0.43472954, 0.45577299,
0.43604956]])
我想计算超过给定值的单元格数量,比如说0.5
,并将不超过该值的单元格设置为0.0
。我就是这么做的:
count=0
value=0.5
for i in range(myarray.shape[0]):
for j in range(myarray.shape[1]):
if myarray[i][j]<value:
myarray[i][j]=0
elif myarray[i][j]>=value:
count=count+1
percentage=round(100*count/(myarray.shape[0]*myarray.shape[1]),2)
count=0
值=0.5
对于范围内的i(myarray.shape[0]):
对于范围内的j(myarray.shape[1]):
如果myarray[i][j]=值:
计数=计数+1
百分比=整数(100*count/(myarray.shape[0]*myarray.shape[1]),2)
但是,我得到了这个错误:
ValueError:包含多个元素的数组的真值是不明确的。使用a.any()或a.all()
,指向我检查的行,如果myarray[I][j]正常情况下,您可以比较两个数字以获得真值。例如:
elem = 5
if elem < 6:
# do something
elem = [5,7]
if elem < 6:
# this doesn't make sense
elem = np.array([5,7])
if np.any(elem<6):
# this is true, because 5 < 6
if np.all(elem<6):
# this isn't true, because 7 > 6
但是,不能将数组与值进行比较。例如:
elem = 5
if elem < 6:
# do something
elem = [5,7]
if elem < 6:
# this doesn't make sense
elem = np.array([5,7])
if np.any(elem<6):
# this is true, because 5 < 6
if np.all(elem<6):
# this isn't true, because 7 > 6
是的,我认为你的numpy.array有一个额外的括号,或者它包含了另一个数组
已尝试手动将数组设置为
myarray=np.array([[ 0.47174344, 0.45314669, 0.46395022, 0.47440382, 0.50709627,0.53350065, 0.5233444 , 0.49974663, 0.48721607, 0.46239652, 0.4693633 , 0.47263569, 0.47591957, 0.436558 , 0.43335574,0.44053621, 0.42814804, 0.43201894, 0.43973886, 0.44125302, 0.41176999],[ 0.46509004, 0.46221505, 0.48824086, 0.50088744, 0.53040384,0.53592231, 0.49710228, 0.49821022, 0.47720381, 0.49096272,0.50438366, 0.47173162, 0.48813669, 0.45032002, 0.44776794,0.43910269, 0.43326132, 0.42064458, 0.43472954, 0.45577299,0.43604956]])
而且代码是有效的
但背景:
myarray=np.array([[[ 0.47174344, 0.45314669, 0.46395022, 0.47440382, 0.50709627,0.53350065, 0.5233444 , 0.49974663, 0.48721607, 0.46239652, 0.4693633 , 0.47263569, 0.47591957, 0.436558 , 0.43335574,0.44053621, 0.42814804, 0.43201894, 0.43973886, 0.44125302, 0.41176999],[ 0.46509004, 0.46221505, 0.48824086, 0.50088744, 0.53040384,0.53592231, 0.49710228, 0.49821022, 0.47720381, 0.49096272,0.50438366, 0.47173162, 0.48813669, 0.45032002, 0.44776794,0.43910269, 0.43326132, 0.42064458, 0.43472954, 0.45577299,0.43604956]]])
产生了类似的错误无论您可以简单地执行以下操作:
myarray[myarray<value]=0
np.count_nonzero(myarray)
myarray[myarraySounds就像你的数组不是你想象的那样。我可以运行上面的代码片段,没有任何错误。与你的脚本相同。百分比值为16。