simplifying | lightweight library containing multiple utility functions | Game Engine library
kandi X-RAY | simplifying Summary
kandi X-RAY | simplifying Summary
A lightweight library containing multiple utility functions to make your life easier when dealing with arrays and objects.
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QUESTION
Suppose I have the following simple formula
...ANSWER
Answered 2021-Jun-12 at 19:57Something like this?
QUESTION
Why does calling fake.Provide() wipe out fakes already configured with A.CallTo()? Is this a bug?
I'm trying to understand a problem I've run into with Autofac.Extras.FakeItEasy (aka AutoFake). I have a partial solution, but I don't understand why my original code doesn't work. The original code is complicated, so I've spent some time simplifying it for the purposes of this question.
Why does this test fail? (working DotNetFiddle)
...ANSWER
Answered 2021-Jun-12 at 02:41It isn't that the Fake's configuration is being changed. In the first test, Resolve is returning different Fakes each time it's called. (Check them for reference equality; I did.)
Provide creates a new scope and pushes it on a stack. The topmost scope is used by Resolve when it finds an object to return. I think this is why you're getting different Fakes in ACallTo_before_Provide.
Is this a bug? Or is this the expected behavior? If this is the expected behavior, can someone explain why it works like this?
It's not clear to me. I'm not an Autofac user, and don't understand why an additional scope is introduced by Provide. The stacked scope behaviour was introduced in PR 18. Perhaps the author can explain why.
In the meantime, if possible, I'd Provide all you need to before Resolveing, if you can manage it.
QUESTION
I'm currently having a bit of trouble with CGAL's Polyline Simplification.
More specifically, for the following example, PS::simplify(ct, Cost(), Stop(0.2)) results in a self-intersecting polyline. In the image below, the blue polyline is the input polyline into PS::simplify() while the green polyline is the resulting (output) polyline. The red arrow points to the self-intersection in the resulting polyline.
Further below, I have copied and pasted my code from 2 files simplify_test.cpp and CMakeLists.txt. With the required libraries installed, to run this example, you may place them in the same directory, cd to that directory, and run the following in your terminal:
ANSWER
Answered 2021-Jun-09 at 00:32In the C++ code below, I essentially replaced Polyline with Polygon_with_holes_2. For all values of stop, I now get topologically valid simplified polygons. I edited your output function. You can copy and paste the output from the new function print_coords_for_geogebra() directly into Geogebra.
Here is the edited version of simplify_test.cpp. You can compile it with the same CMakeLists.txt that you included in your original post.
QUESTION
I have a class:
...ANSWER
Answered 2021-Jun-07 at 12:48For starters, you can't use x => x.Age && x.Country && x.Name -- Age is an int and Name is a string, and you can't combine those with &&, so you'll get a compiler error. But we can use + instead as string concatentation, or return a new { x.Name, x.Age, x.Country } or new object[] { x.Name, x.Age, x.Country }.
Either way, the easiest way to do this is to use an ExpressionVisitor to find all MemberAccess expressions which access a property on our input Student, wherever they're buried in the expression:
QUESTION
Although my question is related to a specific problem, I would like to approach it in more general terms. I would like to simplify a fractional complex expression obtained by multiplying symbolic matrices using the sympy package. What I get is a fraction with real parameters and many complex exponential terms (phase terms) like exp(-jd), exp(-2jd) and also exp(-4j*d). I get the correct result, but when I try to calculate the ||**2, which is a real expression, sympy.simplify() is not able to manage the phase terms and I obtain a huge expression I have to reduce by hand. My test procedure, being T, M, M_inv, F and T, 2x2 symbolic matrices is:
...ANSWER
Answered 2021-Jun-01 at 13:59A few points:
Don't mix up numpy and sympy like this unless you know exactly what you are doing. There is no need to use numpy at all here so use e.g.
sym.eye(2)andsym.conjugate(val)Don't use floats unless you have a good reason - use
sym.Iinstead of1j. Using numpy can potentially introduce floats so don't do that unless you know what you are doing.Although
eigenvalsreturns a dict in this case you only care about the values of the dict so you can just dolist(M.eigenvals()).Although you declare all symbols as real you are using
sqrt(u)which is real only ifuis positive. Unless you intend forsqrt(u)to be potentially imaginary thenushould be declared as positive.
With the above changes your code looks like this:
QUESTION
Codesandbox: https://codesandbox.io/s/condescending-wiles-funk0?file=/src/App.js
Problem: When I update the state of my store the components are not re-rendered. In the above example you can see from the console that the data is correctly fetched, but the component is not re-rendered and keep rendering just Loading....
Expected behavior: When I update the state, the components are re-rendered.
I found a workaround by using useState in the component and subscribing to store changes like:
...ANSWER
Answered 2021-Mar-26 at 00:41From the useStore docs, it states that the hook shouldn't be used in an app because it doesn't cause the component to re-render:
// EXAMPLE ONLY! Do not do this in a real app.
// The component will not automatically update if the store state changes
Instead, you should be using useSelector instead.
On that note, how you have your codesandbox example would cause an infinite re-render since dispatch(fetchData()); is called every time the redux state is updated. Instead, you'll want to place it within React.useEffect.
For example, using useSelector with useEffect:
QUESTION
I'm trying to set up openstack compute nodes that mimics a real node, however never actually sets up the VMs on a physical host.
In the openstack tests, there are usages of fake drivers (defined in nova/virt/fake.py) through a complex system of testing classes.
I wish to get such a node up and running not within a test (meaning, I don't want to use these classes to spawn the compute node), but on an actual VM/container, however, I cannot figure out how to get a compute process to run with this fake hypervisor (or more specifically, one that will be defined by me).
How do I inject this fake driver instead of the real driver in a compute node?
(also, I'm installing OS using devstack (latest))
For more clarification, my goal is to do stress testing of OS, running multiple fake compute nodes, not in all-in-one configuration. The usage of devstack to setup the controller node is for simplifying the process, but the system should be:
- A controller node, running the core services (Nova, Glance, Keystone etc.).
- Multiple compute nodes, using fake hypervisors on different machines.
ANSWER
Answered 2021-May-25 at 14:07When installing a new compute node, there is a configuration file nova-compute.conf that is being created automatically.
It seems that in /etc/nova/nova-compute.conf there is an option:
QUESTION
I am using kable and kableExtra and want to display a table with columns of percentages (in format "95%"). I would also like to do conditional formatting of the cell backgrounds based on the percent value (with multiple colors and cut points). In addition, there are a few NAs mixed in.
I have tried some of the methods in this post, but don't like the cell_spec background shading that does not shade the full cell, so would prefer to use column_spec within kable. However all the options I have found to display the percent convert the percent to a character variable, which then limits my ability to do the conditional formatting.
As I was simplifying my example code to post here (after several hours of errors), I did finally get it working using startWith (which is an OK solution in this case because my cutpoints are at 80% and 90%, but not ideal for all cases).
...ANSWER
Answered 2021-May-15 at 05:06Create a separate column for labels and use case_when to compare with numbers.
QUESTION
We currently have VM environment setup with an internal network and a DMZ network. Historically we had no open ports between these environments, but needs arose for communication between the internet and services/APIs running on our internal servers.
We decided to use our DMZ network as a proxy/gateway, where we specifically use Kong Gateway, exposing ports 80/443 to the internet, and then proxying/forwarding requests through a different port opened up between the DMZ server and the specific internal server that needs to handle this communication. A random, non-standard, high port is being used for all requests between the DMZ server and our internal network, and we then use a reverse proxy on our internal server to route specific request via hostnames to specific APIs/services on the internal server.
Now, we're in the process of converting our internal environment to a k8s cluster, and I'm interested in knowing if there'd be any "real" difference to security, if we were to forego the DMZ proxy, and exposing ports 80/443 directly from the internet to our internal k8s cluster, and handle all the security/authentication/authorization through the ingress controller on our cluster.
It would simplify our infrastructure a decent bit, to not have this DMZ proxy running.
From my understanding the purpose of the DMZ proxy was that if a breach were to happen in the chain, it would be much harder to further penetrate our internal network, if the breach was only on the DMZ server. But my networking and security knowledge is not good enough to say if this is actually true, and it just provides a false sense of extra security, in which case, we'd have the exact same level of security with exposing those same ports directly on our internal k8s cluster, while simplifying the overall infrastructure.
...ANSWER
Answered 2021-May-06 at 20:38if there'd be any "real" difference to security, if we were to forego the DMZ proxy, and exposing ports 80/443 directly from the internet to our internal k8s cluster, and handle all the security/authentication/authorization through the ingress controller on our cluster.
It would simplify our infrastructure a decent bit, to not have this DMZ proxy running.
You probably want a "Gateway" outside the cluster, with a static IP-address. The nodes in the cluster are more dynamic, you want to throw away the old and create new when upgrading e.g. the linux kernel.
From my understanding the purpose of the DMZ proxy was that if a breach were to happen in the chain, it would be much harder to further penetrate our internal network, if the breach was only on the DMZ server.
The book Zero Trust Networks is good about this. Things has changed, the older way of using "DMZ" to protect internal networks, called "perimeter security" is now replaced with a "Zero Trust Networking" model. Now every host (or Pod) should be responsible for its security, on Kubernetes, to get this hardened, you can use a "Service Mesh" to implement mutual TLS between all services, see e.g. istio.
QUESTION
Playground link:
...ANSWER
Answered 2021-May-03 at 03:04You don't need to write out the full type if you replace <(&Bound,&Bound,i32)>::from with Into::into in the map call.
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