I made a playground if anyone wants to play with it and figure out how to test their ideas.
https://go.dev/play/p/h1nqHJAdVG8 On Sunday, September 10, 2023 at 12:24:54 AM UTC+1 Jason E. Aten wrote: > Like how, specifically? > > func (m *Matrix[float64]) NanToZero() { > for i := 0; i < m.Nrow; i++ { > for j := 0; j < m.Ncol; j++ { > v := m.At(i, j).(float64) > if math.IsNaN(v) { > m.Set(i, j, 0) > } > } > } > } > gives > ./slurp1.go:944:9: invalid operation: cannot use type assertion on type > parameter value m.At(i, j) (value of type float64 constrained by Addable) > > On Sunday, September 10, 2023 at 12:04:53 AM UTC+1 Dan Kortschak wrote: > >> 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. >> >> -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/4f7e642b-ef44-4564-93e7-b2f7c10ffb6dn%40googlegroups.com.
