On Sat, 2023-09-09 at 15:39 -0700, Jason E. Aten wrote:
> New to generics... how can I write a method for a Matrix[float64]
> that uses a math function that expects a float64? I get:
>
> ./slurp1.go:936:18: cannot use m.At(i, j) (value of type float64
> constrained by Addable) as float64 value in argument to math.IsNaN
>
> Casting it to float64() does not change this error(!)
>
> here is the essentials:
>
> type Addable interface {
> ~complex128 | ~complex64 | ~float64 | ~float32 |
> ~byte | ~uint16 | ~uint32 | ~uint64 |
> ~int8 | ~int16 | ~int32 | ~int64 | ~int
> }
>
> type Matrix[T Addable] struct {
> Nrow int
> Ncol int
> Dat []T
> }
> ...
> func (m *Matrix[float64]) NanToZero() {
> for i := 0; i < m.Nrow; i++ {
> for j := 0; j < m.Ncol; j++ {
>
> if math.IsNaN(m.At(i, j)) { // line 936, where the error
> is; ./slurp1.go:936:18: cannot use m.At(i, j) (value of type float64
> constrained by Addable) as float64 value in argument to math.IsNaN
>
> m.Set(i, j, 0)
> }
> }
> }
> }
>
> go version go1.20.6 linux/amd64
You will probably need to type assert.
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