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QUESTION
I have a working flappy bird code but I was told to use canvas instead. I've tried to read other flappy bird codes but they were very different than mine so every time I tried to apply their codes it didn't work. How can I change my code so the js will contain the build of the canvas and then I can call the game on canvas in the html?
Here is my code snippet:
...ANSWER
Answered 2021-May-30 at 01:13QUESTION
Sorry for my english I'm French.
I develop in Flutter (dart) and I experience a strange behavior in my code using Cubit (Bloc) when I want to redirect to a page after a form submission (with "Reactive forms" package, but also with classic form) and the step of the Cubit loaded state: I see 2 calls to the page (2 builds) which gives a sort of "flapping" effect which means that the final user sees the interface charging twice.
It's my first application in Flutter.
I created an application containing a login form: when the form is submitted I print another form.
At the beginning of my application I was using "auto_route" package and I obtained a refresh of the page each time I clicked inside the text field after the login process. So I was not able to write anything inside the text field.
I was thinking that the problem came from the "Reactive forms" package so I opened an issue to the github repository of this package: issue opened
But as I didn't see where was the problem I came back to a much more basic development for my application and also a more basic method for managing the pages routing in order to explain my problem to the maintainer of the "Reactive forms" package, a really nice guy which really tried to help me.
But even the maintainer does not understand why I have this problem.
Now I reduced my more simple code in one page.
For the moment I don't have the problem when I clicked inside the text field but I see that interface is built twice and the Cubit loaded state which maybe explains why I had the initial problem.
So now I try to understand why the interface is built twice before debugging my original code.
I think my main problem is that the Cubit loaded state is waiting a synchronous widget return but when I try to redirect to a another page it needs an asynchronous action (with "auto_route" package or more simply using "Navigator.push()" action).
But I don't know how to call a Future inside a Cubit loaded state which wait a classic Widget.
I tried this:
...ANSWER
Answered 2021-May-28 at 20:52I believe that I have solved your problem. This problem lies within your BlocConsumer
widget.
The builder
method of the BlocConsumer
widget is called multiple times whenever the state of your AuthCubit
changes. This results in myAuthBuildLoaded()
pushing the page twice. That is what is causing the flickering effect. To avoid this, see the example below. The listener
method of the BlocConsumer
widget is only called once on every state change. That should revolve your problem.
QUESTION
I wanted to write a flappy bird game in javascript but it doesn't seem to work when I open it in my browser. the css works. lines 147, 154, 31 and 160 in js all seem to be errors, but I do not understand how to fix them.
this is my html:
...ANSWER
Answered 2021-May-28 at 12:22One way to solve the problem is to move the event listeners into load
and call load
in your script:
QUESTION
I'm working on an Machine Learning Assignment where I go over the bug database, do a multi-class classification and then insert a new column with the classified text. As part of debug , when i run that particular cell again, it says column already exists. i was just wondering if there is a way to get over it (other than the usual Exception handling).
The piece of code that i have written is as follows:
...ANSWER
Answered 2021-May-18 at 20:01It's not working because you already have a column with that name. If you are ok with having duplicate columns then, you can pass allow_duplicates=True.
df.insert(len(df.columns),"Trigger_Type", cat_1, allow_duplicates=True)
Otherwise, you will have to rename the column to something else.
If you want to completely replace the column, you can also use:
df['Trigger_Type'] = cat1
QUESTION
I am trying to increase the speed of an aerodynamics function in Python.
Function Set: ...ANSWER
Answered 2021-Mar-23 at 03:51First of all, Numba can perform parallel computations resulting in a faster code if you manually request it using mainly parallel=True
and prange
. This is useful for big arrays (but not for small ones).
Moreover, your computation is mainly memory bound. Thus, you should avoid creating big arrays when they are not reused multiple times, or more generally when they cannot be recomputed on the fly (in a relatively cheap way). This is the case for r_0
for example.
In addition, memory access pattern matters: vectorization is more efficient when accesses are contiguous in memory and the cache/RAM is use more efficiently. Consequently, arr[0, :, :] = 0
should be faster then arr[:, :, 0] = 0
. Similarly, arr[:, :, 0] = arr[:, :, 1] = 0
should be mush slower than arr[:, :, 0:2] = 0
since the former performs to noncontinuous memory passes while the latter performs only one more contiguous memory pass. Sometimes, it can be beneficial to transpose your data so that the following calculations are much faster.
Moreover, Numpy tends to create many temporary arrays that are costly to allocate. This is a huge problem when the input arrays are small. The Numba jit can avoid that in most cases.
Finally, regarding your computation, it may be a good idea to use GPUs for big arrays (definitively not for small ones). You can give a look to cupy or clpy to do that quite easily.
Here is an optimized implementation working on the CPU:
QUESTION
I'm processing a stream of events coming from IOT devices.
These events have a first level of timestamp, set by the network. They're also packing together several measures taken at different points in time. For instance:
- network time 9:08
- measure M1 taken at 8:52
- measure M2 taken at 9:07
The measures are to be aggregated hourly, in this case M1 should go in an 8:00-9:00 window, and M2 in a 9:00-10:00 window.
I wonder what is the proper way to design my flink app, manage those timestamps, and the related watermarks. From my understanding so far:
- I should probably put all the processing related to network time (9:08) in a separate Flink app.
- Have a Flink app processing the measures after they are unpacked (flap-mapped). Then assign the timestamp with
assignTimestampsAndWatermarks()
, correct ? What strategy should I use, given the 15mn spread there is between measures coming simultaneously ?
--
PS: nope, I can't change the IOT device
PPS: I plan to use EMR, so flink 1.11, if it has any impact on design.
...ANSWER
Answered 2021-Apr-19 at 18:12Typically, with an out-of-order event stream, you want to use the bounded-of-order watermark strategy with a duration large enough to cover the expected out-of-orderness. So at least 15 minutes, in this case.
If you are aggregating hourly windows, this should be pretty workable -- assuming you can tolerate waiting until 15 minutes after the hour ends to see any results. If you can do incremental aggregation of the window results (via reduce
or aggregate
) that will be much more efficient.
QUESTION
I have three fields I want to filter my query by. I want to query even if 1 or 2 of the fields are empty (passing an empty string). I can figure out 1 field, but once I add the other two, I do not get any results. Curly brackets are my form fields that get passed to the query.
...ANSWER
Answered 2021-Apr-13 at 16:14I'm not exactly clear on what your data structure is and the curly braces are throwing me off a bit, but maybe something like this might work for you. You could change your filter conditions to use an OR
with a CASE
to force a match in those cases when the values are blank. Again, I'm not sure of your structure and the below is just following your example, but hopefully this might get you in the right direction.
QUESTION
I’ve got a “flag” animation going and as the cloth material flaps in the wind and sorta folds unto itself I want it display shadows on itself - check out the fiddle to see what I mean:
https://jsfiddle.net/gilomer88/zfa9eLbo/38/
I've set both of my lights to castShadows as follows:
...ANSWER
Answered 2021-Apr-10 at 19:17I checked your fiddle and it seems that on your light variables (light1, light2) you wrote:
QUESTION
ANSWER
Answered 2021-Mar-28 at 21:06You can't access url
in the class definition. That's what the error is telling you about. You should initialize it in the initState()
. That's what this method is for.
QUESTION
I am trying to publish a Python package to PyPI, from a Github workflow, but the authentication fails for "Test PyPI". I successfully published to Test PyPI from the command line, so my API token must be correct. I also checked for leading and trailing spaces in the secret value (i.e., on GitHub).
As the last commits show, I tried a few things without success.
I first tried to inline simple bash commands into the workflow as follows, but I have not been able to get my secrets into environment variables. Nothing showed up in the logs when I printed these variables.
...ANSWER
Answered 2021-Mar-08 at 08:15I eventually figured it out. My mistake was that I defined my secrets within an environment and, by default, workflows do not run in any specific environment. For this to happen, I have to explicitly name the environment in the job description as follows:
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