52 lines
755 B
Go
52 lines
755 B
Go
package clusters
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import (
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"encoding/json"
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"os"
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)
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type jsonImporter struct {
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}
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func JsonImporter() Importer {
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return &jsonImporter{}
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}
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func (i *jsonImporter) Import(file string, start, end int) ([][]float64, error) {
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if start < 0 || end < 0 || start > end {
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return [][]float64{}, errInvalidRange
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}
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f, err := os.ReadFile(file)
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if err != nil {
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return [][]float64{}, err
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}
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var (
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d = make([][]float64, 0)
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s = end - start + 1
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g = make([]float64, 0, s)
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c int
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)
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err = json.Unmarshal(f, &d)
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if err != nil {
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return [][]float64{}, err
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}
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for i := range d {
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c = 0
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for j := start; j <= end; j++ {
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g[c] = d[i][j]
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c++
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}
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d[i] = make([]float64, 0, s)
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for j := 0; j < s; j++ {
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d[i][j] = g[j]
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}
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}
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return d, nil
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}
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