64 lines
2.2 KiB
Go
64 lines
2.2 KiB
Go
// Mgmt
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// Copyright (C) 2013-2024+ James Shubin and the project contributors
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// Written by James Shubin <james@shubin.ca> and the project contributors
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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//
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// Additional permission under GNU GPL version 3 section 7
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//
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// If you modify this program, or any covered work, by linking or combining it
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// with embedded mcl code and modules (and that the embedded mcl code and
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// modules which link with this program, contain a copy of their source code in
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// the authoritative form) containing parts covered by the terms of any other
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// license, the licensors of this program grant you additional permission to
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// convey the resulting work. Furthermore, the licensors of this program grant
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// the original author, James Shubin, additional permission to update this
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// additional permission if he deems it necessary to achieve the goals of this
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// additional permission.
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package coremath
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import (
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"fmt"
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"math"
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"github.com/purpleidea/mgmt/lang/funcs/simple"
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"github.com/purpleidea/mgmt/lang/types"
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)
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func init() {
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simple.ModuleRegister(ModuleName, "sqrt", &types.FuncValue{
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T: types.NewType("func(x float) float"),
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V: Sqrt,
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})
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}
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// Sqrt returns sqrt(x), the square root of x.
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func Sqrt(input []types.Value) (types.Value, error) {
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x := input[0].Float()
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y := math.Sqrt(x)
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if math.IsNaN(y) {
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return nil, fmt.Errorf("result is not a number")
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}
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if math.IsInf(y, 1) {
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return nil, fmt.Errorf("result is positive infinity")
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}
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if math.IsInf(y, -1) {
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return nil, fmt.Errorf("result is negative infinity")
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}
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return &types.FloatValue{
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V: y,
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}, nil
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}
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