48 lines
842 B
Go
48 lines
842 B
Go
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package alg
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import (
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"sync"
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"zhimolostnova_anna_lab_6/util"
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)
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func DeterminantParallel(matrix [][]float64, workers int) float64 {
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size := len(matrix)
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if size == 1 {
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return matrix[0][0]
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}
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if size == 2 {
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return matrix[0][0]*matrix[1][1] - matrix[0][1]*matrix[1][0]
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}
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det := 0.0
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wg := sync.WaitGroup{}
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mu := sync.Mutex{}
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chunks := size / workers
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if chunks == 0 {
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chunks = 1
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}
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for j := 0; j < size; j += chunks {
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wg.Add(1)
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go func(jStart int) {
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defer wg.Done()
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localDet := 0.0
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for jj := jStart; jj < jStart+chunks && jj < size; jj++ {
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subMatrix := util.GetMinor(matrix, jj)
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sign := 1
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if jj%2 != 0 {
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sign = -1
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}
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localDet += float64(sign) * matrix[0][jj] * DeterminantParallel(subMatrix, workers)
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}
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mu.Lock()
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det += localDet
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mu.Unlock()
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}(j)
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}
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wg.Wait()
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return det
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}
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