show me the golang code for matrix ops

Sure, here's some example Go code for basic matrix operations:

package main

import (
    "fmt"
)

type Matrix [][]int

func main() {
    // create two matrices
    matrix1 := Matrix{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}
    matrix2 := Matrix{{9, 8, 7}, {6, 5, 4}, {3, 2, 1}}

    // print the matrices
    fmt.Println("Matrix 1:")
    printMatrix(matrix1)
    fmt.Println("Matrix 2:")
    printMatrix(matrix2)

    // perform matrix addition
    matrix3 := addMatrices(matrix1, matrix2)
    fmt.Println("Matrix 3 (matrix1 + matrix2):")
    printMatrix(matrix3)

    // perform matrix multiplication
    matrix4 := multiplyMatrices(matrix1, matrix2)
    fmt.Println("Matrix 4 (matrix1 * matrix2):")
    printMatrix(matrix4)
}

func addMatrices(matrix1 Matrix, matrix2 Matrix) Matrix {
    rows := len(matrix1)
    cols := len(matrix1[0])
    result := make(Matrix, rows)

    for i := 0; i < rows; i++ {
        result[i] = make([]int, cols)
        for j := 0; j < cols; j++ {
            result[i][j] = matrix1[i][j] + matrix2[i][j]
        }
    }

    return result
}

func multiplyMatrices(matrix1 Matrix, matrix2 Matrix) Matrix {
    rows1 := len(matrix1)
    cols1 := len(matrix1[0])
    rows2 := len(matrix2)
    cols2 := len(matrix2[0])

    if cols1 != rows2 {
        panic("Invalid matrix dimensions for multiplication")
    }

    result := make(Matrix, rows1)
    for i := 0; i < rows1; i++ {
        result[i] = make([]int, cols2)
        for j := 0; j < cols2; j++ {
            sum := 0
            for k := 0; k < cols1; k++ {
                sum += matrix1[i][k] * matrix2[k][j]
            }
            result[i][j] = sum
        }
    }

    return result
}

func printMatrix(matrix Matrix) {
    for i := 0; i < len(matrix); i++ {
        fmt.Println(matrix[i])
    }
    fmt.Println()
}

This code defines a `Matrix` type as a slice of slices of integers. It then defines functions for adding and multiplying matrices, as well as a function for printing matrices. The `main` function creates two matrices, performs matrix addition and multiplication, and prints the results.