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FAQ: f_resolution() #44

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Sep 2, 2019
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FAQ: f_resolution() #44

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33 changes: 33 additions & 0 deletions faq_and_code/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -417,6 +417,39 @@ resFromMinutes = f_resFromMinutes(resInMinutes)
f_print("f_resInMinutes() = " + tostring(resInMinutes) +"\nf_resFromMinutes(_minutes) = " + resFromMinutes)
```

### How can I get the resolution in milliseconds from a string in the `input.resolution` or `timeframe.period` format?
This code presents two ways to go about it. The second method should be preferred, as it is more reliable than the first, which breaks when intervals between bars are irregular, which can happen for many reasons.
```
//@version=4
study("f_resolution()", "", true, scale = scale.none)
minutes = 60 * 1000
higherRes = input("1D", "Interval used for security() calls", type = input.resolution)
f_print(_txt) => var _lbl = label(na), label.delete(_lbl), _lbl := label.new(time + (time-time[1])*3, high, _txt, xloc.bar_time, yloc.price, size = size.large)

// ————— Method 1 (subject to irregularities).
// Use "security()" to fetch delta in ms between bars.
f_resolution(_resolution) => security(syminfo.tickerid, _resolution, change(time))
higherResInMinutes = f_resolution(higherRes) / minutes
currentResInMinutes = f_resolution(timeframe.period) / minutes
plot(higherResInMinutes, "higherResInMinutes", color.blue, linewidth = 10)
plot(currentResInMinutes, "currentResInMinutes", color.aqua, linewidth = 10)

// ————— Method 2 (more secure).
// Get higher interval in ms, using only the smallest values retrieved,
// since occasional situations generate higher than normal intervals.
higherResInMs = 10e20
higherResInMs := min(security(syminfo.tickerid, higherRes, change(time)), nz(higherResInMs[1], 10e20))
// Get current interval in ms using same technique.
currentResInMs = 10e20
currentResInMs := min(change(time), nz(currentResInMs[1], 10e20))
plot(higherResInMs / minutes, "higherTfInt / minutes", color.orange, linewidth = 3)
plot(currentResInMs / minutes, "currentTfInt / minutes", color.yellow, linewidth = 3)

// ————— Plot label.
f_print("METHOD 1\nHigher Resolution = " + tostring(higherResInMinutes) + "\nCurrent resolution = " + tostring(currentResInMinutes) +
"\n⭐METHOD 2⭐\nHigher Resolution = " + tostring(higherResInMs / minutes) + "\nCurrent resolution = " + tostring(currentResInMs / minutes))
```

### Is it possible to use `security()` on lower intervals than the chart's current interval?
Yes, except that seconds resolutions do not work. So you can call `security()` at 1m from a 15m chart, but not 30sec.

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