CAST | Software for Exploratory Space-Time Analytics | Machine Learning library
kandi X-RAY | CAST Summary
kandi X-RAY | CAST Summary
CAST is a free and open-source, cross-platform program (Windows, Mac OSX and Linux) designed "to detect spatial patterns and trends in space-time data.". It is developed using Python (based on wxPython and PySAL) and C++ (to accelerate some core functionalities e.g. kernel density maps and Local Indicators of Spatial Autocorrelation or LISA maps). Like its sister software GeoDa, CAST provides a user-friendly and graphical interface to methods of exploratory spatial data analysis (ESDA), in this case for space-time data. CAST makes it easy to represent different dimensions of space-time data (like crime types or neighborhood characteristics) in views such as maps, graphs, and calendars that can be animated over time. All of these views are linked to allow analysts to identify how selected subsets of the data are characterized across these dimensions. Using statistical significance tests, CAST includes several cluster maps and trend graphs to detect where concentrations of crimes are higher or lower than expected.
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CAST Examples and Code Snippets
Community Discussions
Trending Discussions on CAST
QUESTION
I want to Edit data, so for that, I should display it in a form.
In my table in the database, I have a primary key named id_casting
So I have he following code :
My script :
...ANSWER
Answered 2021-Jun-15 at 22:38By default laravel thinks that id is the primary key in your table. To fix this you would have to a primary key variable in your model
QUESTION
Hey guys given the example below in C when operating on a 64bit system as i understand, a pointer is 8 byte. Wouldn't the calloc here allocate too little memory as it takes the sizeof(int) which is 4 bytes? Thing is, this still works. Does it overwrite the memory? Would love some clarity on this.
Bonus question: if i remove the type casting (int*) i sometimes get a warning "invalid conversion from 'void*' to 'int*', does this mean it still works considering the warning?
...ANSWER
Answered 2021-Jun-15 at 21:19calloc
is allocating the amount of memory you asked for on the heap. The pointer is allocated by your compiler either in registers or on the stack. In this case, calloc
is actually allocating enough memory for 4 int
s on the heap (which on most systems is going to be 16 bytes, but for the arduino uno it would be 8 because the sizeof(int)
is 2), then storing the pointer to that allocated memory in your register/stack location.
For the bonus question: Arduino uses C++ instead of C, and that means that it uses C++'s stronger type system. void *
and int *
are different types, so it's complaining. You should cast the return value of malloc
when using C++.
QUESTION
I am trying to write the following C code in Metal Shading Language inside of a kernel void
function:
ANSWER
Answered 2021-Jun-15 at 21:02Don't know about metal
specifically, but in ordinary C, you'd want to put f
and byteArray
inside a union
Here's some sample code:
QUESTION
In C++20, we got the capability to sleep on atomic variables, waiting for their value to change.
We do so by using the std::atomic::wait
method.
Unfortunately, while wait
has been standardized, wait_for
and wait_until
are not. Meaning that we cannot sleep on an atomic variable with a timeout.
Sleeping on an atomic variable is anyway implemented behind the scenes with WaitOnAddress on Windows and the futex system call on Linux.
Working around the above problem (no way to sleep on an atomic variable with a timeout), I could pass the memory address of an std::atomic
to WaitOnAddress
on Windows and it will (kinda) work with no UB, as the function gets void*
as a parameter, and it's valid to cast std::atomic
to void*
On Linux, it is unclear whether it's ok to mix std::atomic
with futex
. futex
gets either a uint32_t*
or a int32_t*
(depending which manual you read), and casting std::atomic
to u/int*
is UB. On the other hand, the manual says
The uaddr argument points to the futex word. On all platforms, futexes are four-byte integers that must be aligned on a four- byte boundary. The operation to perform on the futex is specified in the futex_op argument; val is a value whose meaning and purpose depends on futex_op.
Hinting that alignas(4) std::atomic
should work, and it doesn't matter which integer type is it is as long as the type has the size of 4 bytes and the alignment of 4.
Also, I have seen many places where this trick of combining atomics and futexes is implemented, including boost and TBB.
So what is the best way to sleep on an atomic variable with a timeout in a non UB way? Do we have to implement our own atomic class with OS primitives to achieve it correctly?
(Solutions like mixing atomics and condition variables exist, but sub-optimal)
...ANSWER
Answered 2021-Jun-15 at 20:48You shouldn't necessarily have to implement a full custom atomic
API, it should actually be safe to simply pull out a pointer to the underlying data from the atomic
and pass it to the system.
Since std::atomic
does not offer some equivalent of native_handle
like other synchronization primitives offer, you're going to be stuck doing some implementation-specific hacks to try to get it to interface with the native API.
For the most part, it's reasonably safe to assume that first member of these types in implementations will be the same as the T
type -- at least for integral values [1]. This is an assurance that will make it possible to extract out this value.
... and casting
std::atomic
tou/int*
is UB
This isn't actually the case.
std::atomic
is guaranteed by the standard to be Standard-Layout Type. One helpful but often esoteric properties of standard layout types is that it is safe to reinterpret_cast
a T
to a value or reference of the first sub-object (e.g. the first member of the std::atomic
).
As long as we can guarantee that the std::atomic
contains only the u/int
as a member (or at least, as its first member), then it's completely safe to extract out the type in this manner:
QUESTION
I have the following two interfaces, one which allows a nullable vin
, the other that doesn't:
ANSWER
Answered 2021-Jun-15 at 18:49You can use a type predicate to define a user-defined type guard like this:
QUESTION
I have a Spring Boot app with a Kafka Listener implementing the BatchAcknowledgingMessageListener interface. When I receive what should be a single message from the topic, it's actually one message for each line in the original message, and I can't cast the message to a ConsumerRecord.
The code producing the record looks like this:
...ANSWER
Answered 2021-Jun-15 at 17:48You are missing the listener type configuration so the default conversion service sees you want a list and splits the string by commas.
QUESTION
How do I get the object type so I can directly cast to it? This is the ideal method I would like to execute:
...ANSWER
Answered 2021-Jun-15 at 17:41All controls derive from Control
. Therefore, instead of using the type Object
use Control
. Control
has most of the members of these controls like a Click
event.
QUESTION
I have 2 tables like below :
...ANSWER
Answered 2021-Jun-15 at 15:40Use outer apply
:
QUESTION
I wish to move a large set of files from an AWS S3 bucket in one AWS account (source), having systematic filenames following this pattern:
...ANSWER
Answered 2021-Jun-15 at 15:28You can use sort -V
command to consider the proper versioning of files and then invoke copy command on each file one by one or a list of files at a time.
ls | sort -V
If you're on a GNU system, you can also use ls -v
. This won't work in MacOS.
QUESTION
I am aware that floating-point numbers are tricky. But today I encountered a case that I cannot explain (and cannot reproduce using a standalone C++ code).
The code within a large project looks like this:
...ANSWER
Answered 2021-Jun-15 at 09:57Barring the undefined behavior which can be easily be fixed, you're seeing the effect of denormal numbers. They're extremely slow (see Why does changing 0.1f to 0 slow down performance by 10x?) so in modern FPUs there are usually denormals-are-zero (DAZ) and flush-to-zero (FTZ) flags to control the denormal behavior. When DAZ is set the denormals will compare equal to zero which is what you observed
Currently you'll need platform-specific code to disable it. Here's how it's done in x86:
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