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https://github.com/mihakralj/QuanTAlib.git
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Miha Kralj
86fe32a682
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com> Co-authored-by: aider (openrouter/anthropic/claude-sonnet-4) <aider@aider.chat> Co-authored-by: Warp <agent@warp.dev>
48 lines
1.4 KiB
Plaintext
48 lines
1.4 KiB
Plaintext
// The MIT License (MIT)
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// © mihakralj
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//@version=6
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indicator("Elder's Force Index (EFI)", "EFI", overlay=false)
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//@function Calculates Elder's Force Index (EFI), measuring buying and selling pressure through price change and volume
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//@doc https://github.com/mihakralj/pinescript/blob/main/indicators/volume/efi.md
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//@param len Lookback period for EMA smoothing (default: 13)
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//@param src Source price for calculation (default: built-in close)
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//@param src_vol The volume (default: built-in volume)
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//@returns float The smoothed Force Index value
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efi(len = 13, src = close, src_vol = volume) =>
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if len < 1
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runtime.error("Length must be >= 1")
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var float prev_src = src
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float raw_force = (nz(src) - nz(prev_src)) * nz(src_vol)
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prev_src := src
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float a = 2.0 / (len + 1.0)
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float beta = 1.0 - a
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var float ema = na
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var float result = na
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var float e = 1.0
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var bool warmup = true
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if na(ema)
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ema := 0
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result := raw_force
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else
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ema := a * (raw_force - ema) + ema
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if warmup
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e *= beta
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float c = 1.0 / (1.0 - e)
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result := c * ema
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if e <= 1e-10
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warmup := false
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else
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result := ema
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result
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// ---------- Inputs ----------
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i_length = input.int(13, "Length", minval=1)
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// ---------- Calculations ----------
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efi_val = efi(i_length)
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// ---------- Plotting ----------
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plot(efi_val, "EFI", color=color.yellow, linewidth=2)
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