douaipi3965 2018-09-21 22:35
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在golang中将矩阵打印为字符串

I have a matrix of integers, represented by a multivariate array. I'm trying to concatenate the numbers into a string representation, rows-by-columns. My naive approach is to walk over all entries in the matrix and append them to a nullstring.

However, I'm getting an error that my append function is saying:

./main.go:xx:yy: first argument to append must be slice; have string

My code is:

type MatString string 
type IntMat [3][3]Int // external constraints require fixed size, symmetric.

func Matrix2String(t IntMat) MatString {
    // s var string
    s := ""
    for i := range t {
        for j := range t[i] {
            s = append(s[:], fmt.Sprintf("%s", j))
            // fmt.Sprintf(s)
        }
    }
    return MatString(s)
}

What am I misunderstanding about arrays, slices, and joins, and how can I iteratively build up this string correctly?

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  • douwuying4709 2018-09-21 22:39
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    Collect the elements in a slice of strings. Join the slice to produce the result.

    func Matrix2String(t IntMat) MatString {
        var s []string
        for i := range t {
            for _, n := range t[i] {
                s = append(s, fmt.Sprintf("%d", n))
            }
        }
        return MatString(strings.Join(s, ""))
    }
    

    Another approach is to build the string in a []byte and convert at the end:

    func Matrix2String(t IntMat) MatString {
        var s []byte
        for i := range t {
            for _, n := range t[i] {
                s = strconv.AppendInt(s, int64(n), 10)
            }
        }
        return MatString(s)
    }
    

    I didn't include any delimiters because the question didn't include them.

    本回答被题主选为最佳回答 , 对您是否有帮助呢?
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