> > >I think you want the `matrix-ref` function. > While this does give me the value, I am unable to set it.
Calling (define M (matrix ([1 2 3] [4 5 6]))) (set! (matrix-ref M 0 2) 5) Leads to the error: ; .../Example.rkt:228:6: set!: not an identifier ----------------- And array-set! for changing the value of an entry. What would be the syntax for that? I noticed that a requirement for using array-set! is that the array passed in needs to be a settable array, and that the matrices in math/matrix are not such a type of array. I get this error: array-set!: contract violation ; expected: Settable-Array? ; given: (array #[#[1 2 3]]) ; in: the 1st argument of ; (-> ; (struct/c ; Settable-Array ; (vectorof Index) -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
