1. /home/cxd/.conda/envs/python36/lib/python3.6/site-packages/ipykernel_launcher.py:1: RuntimeWarning: invalid value encountered in sqrt """Entry point for launching an IPython kernel. array([ 2.77686781, nan, nan, nan, 2.075821 , nan, 2.0710921 ]) 1. 2. 3. 4. 5. 6. 7. 8. ...
C:\Users\Administrator\Desktop\learn.py:6: RuntimeWarning: invalid value encountered in arcsin print(np.arcsin(a)) [[ 1.57079633 nan nan] [ nan nan nan]] 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 当矩阵中的元素不在定义域范围内,会产生RuntimeWarning,结果为nan(not a...
[0.52359878 0.64350111 0.7753975 0.92729522] [1.11976951 1.57079633 nan nan]] /Applications/anaconda3/lib/python3.6/site-packages/ipykernel_launcher.py:2: RuntimeWarning: invalid value encountered in arcsin # 判断矩阵元素中是否含有np.nan值 print(np.isnan(arr)) [[False False False] [False False ...
{'divide': 'warn', 'over': 'warn', 'under': 'ignore', 'invalid': 'warn'} 修改后的错误行为: {'divide': 'warn', 'over': 'warn', 'under': 'ignore', 'invalid': 'warn'} RuntimeWarning: divide by zero encountered in log RuntimeWarning: invalid value encountered in log 计算结果...
py:6: RuntimeWarning: invalid value encountered in arcsin print(np.arcsin(a)) [[ 1.57079633 nan nan] [ nan nan nan]] 当矩阵中的元素不在定义域范围内,会产生RuntimeWarning,结果为nan(not a number)。 矩阵乘法(点乘) 矩阵乘法必须满足矩阵乘法的条件,即第一个矩阵的列数等于第二个矩阵的行数。
log10([-1, 0.01, 0.1, 1, 2, 5, 10, 100, 1000, 10000]) ## <string>:1: RuntimeWarning: invalid value encountered in log10 ## array([ nan, -2. , -1. , 0. , 0.30103, 0.69897, ## 1. , 2. , 3. , 4. ]) Take note of the warning and the not-a-number (NaN) ...
numpy是Python的一种开源的数值计算扩展库。这种库可用来存储和处理大型numpy数组,比Python自身的嵌套列表结构要高效的多(该结构也可以用来表示numpy数组)。 numpy库有两个作用: 区别于list列表,提供了数组操作、数组运算、以及统计分布和简单的数学模型 计算速度快,甚至要由于python内置的简单运算,使得其成为pandas、sk...
arccos(-1.2) print(a) 1 2 3 打印nan值,并且有错误信息 RuntimeWarning: invalid value encountered in arccos 在图像处理中,出现nan会影响矩阵操作,如何判断该值为nan呢? 方法一:通过numpy包中的API判断,np.isnan(变量名) 返回值为True和False import numpy as np a = float('nan') print(np.isnan(...
out_arraywitharccos: [-1. -0.84125353 -0.41541501 0.14231484 0.65486073 0.95949297 0.95949297 0.65486073 0.14231484 -0.41541501 -0.84125353 -1. ] RuntimeWarning: invalid value encountered inarccosout_array1 = np.sin(in_array) 参考文献: https://docs.scipy.org/doc/numpy-dev/reference/generated/numpy...
np.arccos(arr) 对numpy数组arr中每个元素取反余弦,arccos(x)arccos(x) np.arctan(arr) 对numpy数组arr中每个元素取反正切,arctan(x)arctan(x) np.exp(arr) 对numpy数组arr中每个元素取指数函数,exex np.sqrt(arr) 对numpy数组arr中每个元素开根号x−−√x 一元函数:abs, sqrt, exp, log, ceil,...