kandi X-RAY | simi Summary
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QUESTION
I am using a ListView.Builder to display my data to the screen which is working very fine, then I implemented the Dismiss and onDismiss function which seem to be working fine but it I try to dismiss item-A it will dismiss it from the screen but on the showSnackBar its displaying that Item-Z was deleted, if I deleted item-B it still gives me the name of of item-Z on the showSnackBar, I added more items to the data List which made item-Z now item-X but if I swipe its still shows me that the new item-Z has been deleted, then I tried deleting the Last Item which is the item-Z and it gave me an error
[. Exception caught by animation library ═════════════════════════════════ The following RangeError was thrown while notifying listeners for AnimationController: RangeError (index): Invalid value: Not in inclusive range 0..3: 4
When the exception was thrown, this was the stack #0 List.[] (dart:core-patch/growable_array.dart:177:60) #1 _ListsState.build.. package:another_test/list_widget.dart:81. ]
this is the code down bellow
...ANSWER
Answered 2021-Apr-18 at 03:32Snackbar is trying to get the name, but the item is already deleted by that time. The solution would be to get the title name before the item is deleted from the list.
Change onDismissed to this:
QUESTION
I'm trying to write a loop to measure pairwise similarity between any two rows from a matrix of values where each row contain 4 responses from an individual's evaluation for 5 persons (including himself/herself):
...ANSWER
Answered 2021-Apr-21 at 17:14If you need a list of lists, then you need to create exactly that:
Check below:
QUESTION
I am new to flutter so I was trying to build a scrollable listtile objects. So after building it I tried to make the iconbutton change color when onpressed which works but when I press a single button it changes the colors of all the items. I guess it has to do with assigning a unique id/key to each of the items but am not sure if thats the issue or even how to do that. The code is below:
...ANSWER
Answered 2021-Apr-14 at 19:30That's because you only have one color variable assigned to all the items in your list; if that variable changes, all items changes too.
There are diffrent ways how to solve this; one possible solution would be to add another property to your 'itemlists' object:
QUESTION
I created 3 list items to display using ListView.builder... but after coding the listView is displaying 1 item 3 times, then i added more items to the list making it a total of 5 items, then i discovered it started displaying each item 5 times before displaying the next item and i also noticed it is not scrollable
bellow is the code
...ANSWER
Answered 2021-Apr-15 at 19:20You were using map function to make multiple ListView.builders, this is the solution:
QUESTION
For my short paper, I need to make a network analysis of terrorism. To perform this analysis I have to first form existing data to a more pleasant look.
Task is to perform aggregation on gname, gname2, gname3
with sum of nkill
and count of identical attacks per year in the column of n_attacks
. so if two events are in the same year by the same group twice the n_attacks
would be 2.
INPUT DATA
...ANSWER
Answered 2021-Jan-08 at 23:10Modified answer, based on the updated question
Ok, based on the updated example with sample data, I finally figured out what the OP wanted: a 2-permutation of all 3 gname
columns.
QUESTION
I need a small clarification of how to approach it. I have a list 'm', and i'm iterating through to find an integer above a certain limit, say '90'. I want to stop iterating once this limit is achieved and post the item(that is meeting the condition). For example, if 98.877 is the item, i have to append it to a new list(see below snippet).
Problem
My challenge is that I get to extend only the item the comes before the item that meets the condition. I'd appreciate your help.
...ANSWER
Answered 2020-Sep-18 at 09:57Technically, that's a generator expression, not a list-comprehension.
Regardless, it seems like you just want to find- and append the first item that satisfies a condition, so you'd just use next
:
QUESTION
I have the object contain two arrays of how I match the id from these two arrays using or condition.
e.g
...ANSWER
Answered 2020-Sep-16 at 07:02You can use $filter
to filter using _id
.
QUESTION
I have an array like this
...ANSWER
Answered 2020-Sep-05 at 19:52Try this:
QUESTION
I have the following entries with the type Observable:
...ANSWER
Answered 2020-Jul-28 at 07:57In order to achieve groupby functionality you have to implement your own groupby function.
The function has no difference between using with observables and simple arrays due to the pipe(map()) combination
In order to achive this question is quite similar to this question The algorithm listed there results in an object where the keys of the object is the groupped property and the values are the occurancies in the list.
Example code
private testUser:Observable
QUESTION
Input:
...ANSWER
Answered 2020-Jun-08 at 09:54Inside the for
loop, an index that is out of range for the list of tokens is created as a consequence of the tokens[i + 1]
operation. You could do something like this instead:
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