lissa | A web audio app | Audio Utils library

I am doing the following code but I cannot get the correct percentage as output

I have the following setup: a UICollectionView with a custom cell, where the user can select multiple cells and then perform some heavy image operation. Now I try to update the selected cells which the user selected with the result of that operation, which will be produced by a function of the subclassed custom cell. For all visible cells, the function is called on button press by the user and for all other cells, this happens via cellForItemAt in order to be most efficient.

However, I face the problem now, that the visible cells are all updated but then after scrolling the cells right behind or before the visible cells do not get updated via cellForItemAt but only when scrolling forth and back. Please see the attached video.

For demonstration purposes I just show a green UIView for the image operation. Because that operation is resource heavy, I cannot use any of the UICollectionView reloadData or similar, as they would deselect the selected cells, and manual re-selection will cause flickering.

ViewController

I have a dataframe with millions of rows, and about 100k unique ID numbers. I want to perform operations per unique ID. For now I generate a subset per unique ID and perform some operations accordingly. This loops works. But how do I efficiently combine the subsets into one dataframe?

Maybe there is a more efficient way to perform operations per subset of unique IDs.

Thanks

I am following a tutorial in r-graph-gallery for circular barchart customization adjusted with my data because I want to see the 5 highest costs per topic. This is my data structure:

i need to load customer city, according to customer name. i am using below code to do it.

I have created 2 input texts, one is ID and the other is Name. If I type an ID in the 1st input text then press tab or click the 2nd input text (using onfocusout in HTML), the 2nd input text will automatically filled with name assigned to that ID. Example, typing ID '001' will display 'Elnora'. Likewise, typing 'Soo' in the 2nd input text (and press tab) will display '010' in the 1st input text. Basically it is a one-to-one mapping based on index number. This works flawlessly as you can see in my Jsfiddle.