change a content/variable at a later time in rails? - ruby-on-rails

i tried looking at capture, yield, content_for don't think any of these is the solution.
i'm trying to create a reports, calculating and looping column by column, row by row.
But i need to display an average for each of the column, but i will not be able to calculate the average not until i have the totals for each of my rows.
by the time I have finished showing all the totals, the HTML table has been rendered. now without using Javascript, is there anything i can do like a "placeholder" that i can put in the table that i can reference and at a later stage?

Sounds like you are trying to do these calculations in the view. I would suggest doing it in the controller looping through your data. Try keeping out heavy calculations from views.

Related

I'm looking for a Google Sheet array function to add specific increments in each row

Here's how it looks.
Hi. I'll try to be as specific as possible about this :)
I'm making a Google Sheet page similarly to a game character progression, that will automatically fill up based on data from other sheets: specifically, these "EXP" bars fill up with values based on the hidden cell A5.
For instance, the cells from D5 to BA5 represent LV1.
As the function shows, every time the value in A5 reaches an even number (for LV1, it's all even numbers from 2 to 100), one of the slots will fill up with a number, that with conditional formatting, will change the color of the cell and make it look like an actual exp bar filling up.
I'm using the function =COUNTIF(A5,">=2") and manually changing it to ">=4", ">=6" etc until ">=100" for the first bar. The second bar will have its 50 cells with all even numbers from ">=102" to ">=200".
So, to get to the question: is there an array formula that facilitates the process of filling a great amount of these bars with functions, without changing them all manually? Even automating *some *of this process would be great. Besides it being tedious, it leaves a lot of room for human error.
Thank you in advance to whoever's got an answer.
P
I haven't tried much as at the moment I am very confused by the vast amount of options array formulas provide. I have 48h of experience in the matter.
I suggest you to use the values of columns and rows here as helpers to do calculations. If you know that every column adds 2 and every row adds 100 you can set a formula like this for the whole range (select the whole range and add just one rule of conditional formatting):
=$A$5>((Column(D5)-3)*2+(Row(D5)-5)*100))
You use $symbol to make A5 steady and D5 value will "move" to each cell for conditional formatting, so you don't have to make an ARRAYFORMULA for this

Google Sheets: How to make a stacked/aggregate chart

I have made a bar chart which aggregates my data, but is there any way I can split each bar based on the data it is aggregating - similar to how a stacked bar chart would look?
Here is a bad artists impression (thick blue lines mine). The idea is that it's important to know from looking at the graph if I sold 5 at £1, or 1 at £5.
Ideally this would work even if the price for each item is variable, but that is not essential (eg: if there is a 'hack' with hardcoding Apple = 3, I can live with that.)
I'm also fine inputting helper columns etc, within reason, but I would want to be able to easily continue to add things to the list on the left without having to add new helper columns each time (calculated ones are fine, of course.)
Thanks in advance.
UPDATE: With thanks to Kin Siang below, I ended up implementing a slightly modified version of their solution, which I am posting here for completeness.
I added a very large (but finite) number of helper columns to the right, with a formula in each cell which would look for the nth occurrence of the item in the main list (wrapped in an iferror to make the unused cells blank).
=iferror(index(FILTER($A:$B,$A:$A=$D2),E$1,2))
Theoretically it could run out of space one day, but I have made it suitably large that this should not be an issue. It has the advantage over the other solution that I do not need to sort or otherwise manipulate the input range and can continue trickling in data to the main list and have the chart automatically update.
Yes, it is possible to display the chart in your case, however need some data transpose in order to do so, let me show you the example with dataset
Assuming this is your original data:
First sort the data by alphabet, and enter this formula in new column
=if(G39="",1,if(G40=G39,I39+1,if(G40<>G39,1)))
Next add new column for categorical purpose, by using concatenate function
="Price"&I40
In the transform data for chart purpose, enter this formula to split all price into different row, different column for different product
=sumifs($H$40:$H$47,$G$40:$G$47,$A41,$J$40:$J$47,B$40)
After that i select stack bar chart and ensure the price in under series, in case in 23 will have some problem to set price at series correctly, you can use 33 data create stack bar chart and update the data range again, it will work also
Here is the cute chart you expected, accept if help :)
*When certain fruit has less price record, it is advised to fill in 0, as the data table need in same column (see the orange price 3), although I didnot test if blank

Is it possible to create a scrollable table in Google Sheets without freezing?

I would like to know if it is possible to have a sheet in Google Sheets with like 35 rows and have a table with much more rows of data with a scroll in it.
You can use a Table Chart.
Insert Chart
Select Table for the chart type
Set data range (for the one below B120:B300,C120:C300,E120:E300,F120:F300)
You'll have to have the data on a sheet somewhere and add each column separately as a data range. However it seems poorly supported. Last I checked it doesn't work very well on mobile. Also you can't format colors or font. It does allow sorting by column and alternating row color.
There is no way of doing exactly that. A good alternative is to freeze the rows that you always would like to see. This makes the scrolling not apply to them.

sumif function in excel to display percentage based on text

I am attempting to display a progress percentage in a single cell based on the choice of "completion" from a data validation list that spans multiple columns and cells.
I have attached a screen grab that will hopefully better explain. I would like the "Overall status cell (B3) to display the percentage of "Completes" that will track overall progress of requirements.
I have narrowed to a "sumif" function based on research and former templates but cannot achieve the desired result. Any help would be excellent. Thank you in advance.
You would want to do a =(COUNTIF(C5:C100, "Completed")/COUNTA(C5:C100)).
Obviously, you might want to change the range.
E2A: =SUMIF adds numbers together. Because you're looking at Text, you'll want to do a =COUNTIF and =COUNTA.

Is adding dynamic rows to a table in dart slow?

I'm adding 300 rows to a table dynamically and it's taking about 1.75 seconds to add the rows and at least another 1 to 1.5 seconds to render. I know this might sound like I am being picky but overall it's a 3+ second delay to show the table when this happens and the calcs behind that table execute really quickly.
I'm using a simple TableRowElement row = tBody.addRow();
and then row.addCell() for about ten columns of data. The data is coming from a List of Map objects.
If this is normal, then is there a way I can get the rows to render as they are created to sort of "speed up" the process from the user's point of view?
Thanks!

Resources