PL0 | class experiments and course design
kandi X-RAY | PL0 Summary
kandi X-RAY | PL0 Summary
In-class experiments and course design (including reports) for the GDUT Compilation Principles course
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QUESTION
I'm scraping this website and get an error message is tibble columns must have compatible sizes.
What should I do in this case?
ANSWER
Answered 2020-Aug-23 at 04:33The problem is due to every restaurant not having a complete record. In this example the 13th item on the list did not include the price, thus the price vector had 14 items while the place vector had 15 items.
One way to solve this problem is to find the common parent node and then parse those nodes with the html_node()
function. html_node()
will always return a value even if it is NA.
QUESTION
I'm trying to scrape a page like this one
What they do is to load all information from their server and store it in a javascript function, so that depending on which button you click, it loads one part or another. I was trying to just request the page, and get all the data from the script function, being the structure of the page something like this
...ANSWER
Answered 2020-Jul-03 at 15:04The page looks to be updated by a script after loading.
You can bypass this by using use Selenium instead of requests:
QUESTION
I have two data frames. One of it has codes (1 or -1) for different IDs.
...ANSWER
Answered 2020-Jun-18 at 23:50You can split the qt values by row and insert a 1 as the first value, split the estimates by variable and then multiply and sum:
QUESTION
I am using a jQuery validation plugin and it's partially working. No issue with validating the email field (it shows both wrong emails when entered) but the phone number field is not getting validated.
It shows the message "Please enter the mobile number" but not the "Please enter valid mobile number".
...ANSWER
Answered 2020-Mar-25 at 02:30It shows the message "Please enter the mobile number" but not the "Please enter valid mobile number".
Well, that's because you're over-riding everything here...
QUESTION
We have recently updated our data.table
from version 1.12.0
to 1.12.8
and R from 3.5.3
to 3.6.3
. The example is on Windows OS.
We have a data.table
where we are looping over a Category column and creating a splinefun
object to use later on. We store this splinefun
function outputs in to a list
, within a data.table
column. It worked as expected on our old specs, producing a splinefun
unique for each category level based on the segmented data. However, now it looks like its just keeping the value for the final category and parsing it in to all the entries.
Setup Data
create some fake data for showing the issue
...ANSWER
Answered 2020-Mar-11 at 16:45As I've answered in https://github.com/Rdatatable/data.table/issues/4298#issuecomment-597737776 , adding copy()
on x
and y
variables will solve this issue.
The reason is that splinefun()
would try to store the values of x
and y
. However, the internal object of data.table
is always passed by reference (for the speed)... On this case, you may have to explicitly copy()
the variable in order to have expected answers.
In short, changing
QUESTION
Following asking a previous question, I've tried to use batch transactions with Py2Neo to speed things up. I've adapted my code quite a bit, but seem unable to build and execute a batch of transactions. The matching works fine, it's only the transaction piece at the bottom which I'm having issues with - I thought I would include my entire code, just in case though. The current error I'm getting is as follows:
...ANSWER
Answered 2020-Feb-11 at 06:31The error comes from attempting to "run" Node and Relationship objects. The tx.run
method takes a Cypher string as its first argument, so lines like tx.run(a)
don't make semantic sense.
QUESTION
I have an issue where my script will skip over restaurants if not all elements are present. I want my script to scrape everything and leave "N/A" for any elements not present.
Entire code: https://pastebin.com/af577pCM
...ANSWER
Answered 2019-Aug-10 at 10:28There's a better way to make this more concise overall but the idea is just try catching the errors in their own try
blocks instead of creating a big one. The reason the restos are getting skipped is because once a single element errors out, it goes to continue
right away. A somewhat better way is to rewrite your entire loop like follows:
QUESTION
I have some JQuery that controls the open and close of tabs. It works great - until I have multiple sets of tabs. On click functionality impacts all the sets of tabs. I want to be able to isolate the functionality to the set of tabs that are being interacted with. How do I do this efficiently?
Each tab has a unique ID associated with it
data-tab="tab-{{ blockID }}{{ tabCounter }}">
...ANSWER
Answered 2019-Apr-17 at 05:08The problem is that your code is mostly iterating over the whole document looking for matches. I would recommend finding the tab container (ul.tabs
) of the clicked element, then scoping all of your subsequent operations to that container. For instance, rather than searching for all li
elements inside of a tab container and removing the .active
class, like you have at line six of your JS:
QUESTION
I'm trying to implement a recovery mode on a board powered by OpenWRT. I have a button connected to some GPIO: GPIO_PL4.
I cast the gpio name to a number representation using the next expression:
...ANSWER
Answered 2019-Apr-16 at 10:43I've found a solution. There were two problems:
- U-boot (2018.11) for sunxi-8 devices, at least, doesn't use the above expression to cast a gpio name to a number representation (it's possible to type a gpio name for u-boot
gpio
command:gpio input pl4
). - Port L, by default is unclocked / unpowered on sunxi-8 cpus, at least sun8i-h2-plus-orangepi-zero board, so it has to be clocked/powered by
prcm_apb0_enable
. Look at https://forum.armbian.com/topic/10111-orange-pi-zero-u-boot-gpio-access/?tab=comments#comment-76996
QUESTION
ANSWER
Answered 2017-Apr-27 at 11:06You are always adding active
class and directly after checking if element has this class.
First check, only than add/remove
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