Create array for x axis with known min, max and step - vega-lite

Question

I am trying to create values for x axis for each y data point and I can't create a formula.
This is what I am trying to achieve:
Here is my code:
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"data":{
"values":[
{
"days": {
"min" : 0,
"max" : 10,
"step" : 2,
"count" : [0.2,0.6,0.4,0.3,0.1]
}}
]},
"transform": [
{"calculate": "datum.days.count", "as": "y"},
{"flatten": ["y"]},
{"calculate": "datum.max/datum.step", "as": "x"}
],
"mark": "line",
"encoding": {
"x": { "scale": {"type": "linear", "domain":[0,10], "exponent": 2},"field": "x",
"type": "quantitative"
},
"y": {
"field": "y",
"type": "quantitative"
}
}}
Where count is on y axis and I need generate x axis values for each y point using "min","max" and "step" data (something like "x":[1,2,3,4,5]).
I tried scale function but it didn't work.
I need the x axis to have labels 0,2,4,6,8,10 - because my data max is 10 and step is 2 (10/2).

Answer 1

I'm not sure I fully understand what you're trying to achieve but does the following help?
{
"$schema": "https://vega.github.io/schema/vega-lite/v5.json",
"data": {
"values": [
{
"days": {
"min": 0,
"max": 10,
"step": 2,
"count": [0.2, 0.6, 0.4, 0.3, 0.1]
}
}
]
},
"transform": [
{"calculate": "datum.days.count", "as": "y"},
{"flatten": ["y"]},
{
"window": [{"op": "count", "field": "count", "as": "i"}],
"frame": [null, 0]
},
{"calculate": "(datum.i-1)*2", "as": "x"}
],
"mark": "line",
"encoding": {
"x": {
"scale": {"type": "linear", "domain": [0, 10], "exponent": 2},
"field": "x",
"type": "quantitative"
},
"y": {"field": "y", "type": "quantitative"}
}
}