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Implement math stats precompile #7
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adambalogh
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,28 @@ | ||
| package precompiles | ||
|
|
||
| import ( | ||
| "math" | ||
| "math/big" | ||
|
|
||
| "gonum.org/v1/gonum/stat" | ||
| ) | ||
|
|
||
| // ArbMathStats provides methods for computing statistics | ||
| type ArbMathStats struct { | ||
| Address addr // 0x11b | ||
| } | ||
|
|
||
| func (con *ArbMathStats) StdDev(c ctx, input []int32, decimals uint8) (huge, error) { | ||
| floatInput := make([]float64, len(input)) | ||
| for i, num := range input { | ||
| floatInput[i] = float64(num) | ||
| } | ||
|
|
||
| stdev := big.NewFloat(stat.StdDev(floatInput, nil)) | ||
| stdev.Mul(stdev, big.NewFloat(math.Pow10(int(decimals)))) | ||
|
|
||
| truncatedStdev := new(big.Int) | ||
| stdev.Int(truncatedStdev) | ||
|
|
||
| return truncatedStdev, nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,35 @@ | ||
| package precompiles | ||
|
|
||
| import ( | ||
| "math/big" | ||
| "testing" | ||
| ) | ||
|
|
||
| func TestArbMathStatsStandardDeviationIdenticalElements(t *testing.T) { | ||
| mathStats := ArbMathStats{} | ||
|
|
||
| data := []int32{1, 1, 1, 1, 1, 1} | ||
| stdev, _ := mathStats.StdDev(nil, data, 0) | ||
|
|
||
| if stdev.Cmp(big.NewInt(0)) != 0 { | ||
| t.Errorf("Expected stdev of 0 for identical elements, got: %s", stdev) | ||
| } | ||
| } | ||
|
|
||
| func TestArbMathStatsStandardDeviation(t *testing.T) { | ||
| mathStats := ArbMathStats{} | ||
|
|
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| data := []int32{1, 5, 10, 100} | ||
|
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| stdev, _ := mathStats.StdDev(nil, data, 4) | ||
| expected := big.NewInt(474763) | ||
| if stdev.Cmp(expected) != 0 { | ||
| t.Errorf("Incorrect stddev, expected %s, got %s", expected, stdev) | ||
| } | ||
|
|
||
| stdev, _ = mathStats.StdDev(nil, data, 2) | ||
| expected = big.NewInt(4747) | ||
| if stdev.Cmp(expected) != 0 { | ||
| t.Errorf("Incorrect stddev, expected %s, got %s", expected, stdev) | ||
| } | ||
| } |
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will need to revert these once contracts PR is merged