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How to count the number of true elements in a NumPy bool array
...type=bool)
>>> np.sum(boolarr)
5
Of course, that is a bool-specific answer. More generally, you can use numpy.count_nonzero.
>>> np.count_nonzero(boolarr)
5
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Determine direct shared object dependencies of a Linux binary?
...
If you want to find dependencies recursively (including dependencies of dependencies, dependencies of dependencies of dependencies and so on)…
You may use ldd command.
ldd - print shared library dependencies
...
How to exit from the application and show the home screen?
...d according to that call finish(), in the onCreate() of the root activity
if (getIntent().getBooleanExtra("EXIT", false)) {
finish();
}
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What is causing this error - “Fatal error: Unable to find local grunt”
...runt plugin
gruntfile: A Gruntfile (grunt.js)
3 .grunt init:jquery (if you want to create a jQuery related project.).
It should work.
Solution for v1.4:
1. npm install -g grunt-cli
2. npm init
fill all details and it will create a package.json file.
3. npm install grunt (for grunt depe...
Cross-platform way of getting temp directory in Python
...iable.
The directory named by the TMP environment variable.
A platform-specific location:
On RiscOS, the directory named by the Wimp$ScrapDir environment variable.
On Windows, the directories C:\TEMP, C:\TMP, \TEMP, and \TMP, in that order.
On all other platforms, the directories /tmp, /var/tmp, a...
How to monitor the memory usage of Node.js?
...ay of 10M elements consumers approximately 80MB (take a look at heapUsed).
If you look at V8's source code (Array::New, Heap::AllocateRawFixedArray, FixedArray::SizeFor), then you'll see that the memory used by an array is a fixed value plus the length multiplied by the size of a pointer. The latter...
Sharing src/test classes between modules in a multi-module maven project
...gin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.2</version>
<executions>
<execution>
<goals>
<goal>test-jar</goal>
</goals>
</execut...
Select first 4 rows of a data.frame in R
...
Use head:
dnow <- data.frame(x=rnorm(100), y=runif(100))
head(dnow,4) ## default is 6
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Scala how can I count the number of occurrences in a list
...-> 3, apple -> 3)
The question asks how to find the count of a specific item. With this approach, the solution would require mapping the desired element to its count value as follows:
s.groupBy(identity).mapValues(_.size)("apple")
...
How to disable admin-style browsable interface of django-rest-framework?
...
'rest_framework.permissions.IsAuthenticatedOrReadOnly',
)
}
If you would like to completely hide the API unless the user is logged in, you could also use IsAuthenticated.
FYI: This will also remove the form from the HTML browseable API as it responds to permissions. When an authentic...