Contents of articles
The cause of the problem is solved
problem
Run the following code to prompt for an error
rowsum = np.array([1,2,3])
r_inv = np.power(rowsum, -1)
ValueError: Integers to negative integer powers are not allowed.
reason
The data type of rowsum is integer, not floating-point number. Only floating-point number can perform power operation
solve
rowsum = np.array([1,2,3], dtype=np.float32)
r_inv = np.power(rowsum, -1)
Yesterday, we encountered a problem. CentOS 7 reported an error using the yum installation command
yum install unzip zip
yum install unzip zip
Error reporting
Baidu error reporting is probably due to the image problem. To use the alicloud image
modification command, first backup CentOS- Base.repo , rename it
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
Then download the image
centos7:
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
And then you see, there’s a new CentOS- Base.repo
Just clear the yum cache and regenerate it
yum clera
yum makecache
When the cache is regenerated, it will run for a while. When the cache is generated and no error is reported, you can download it using yum
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preface
Regarding the site management of Django, the login site admin encountered A server error “A Server error occurred. Please contact the Administrator.”
why
Localization, letter case didn’t pay attention to, the right is LANGUAGE_CODE = 'useful - Hans and TIME_ZONE =' Asia/Shanghai , then analysis is setting up the contents of the file is changed after cannot be interpreter identification, so later met the same problem can according to this train of thought analysis (then if new create a project to try again, or if the original error, before the project could be open). Without the model migration, the project's data tables will not be generated, and the login site is a data table operation. Without the migration, how can you log into the site if there are no tables?
The article directories
Solution to the problem cause
The problem
Compiled using latex paper, appear the following Error
y.t ex. 75: Package inputenc Error: Unicode character, (U + FF Ø C) (inputenc) not set
the up for use with L aTeX. See the inputenc Package documentation for explanation.
why
Press the prompt to position to line 75. One comma that I found particularly odd was a Chinese-style comma.
The solution
Remove the Chinese comma and replace it with an English one