diff.awk


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BEGIN {
    sign = "[+-]?"
    decimal = "[0-9]+[.]?[0-9]*"
    fraction = "[.][0-9]*"
    exponent = "([Ee]" sign "[0-9]+)?"
    number = "^" sign "(" decimal "|" fraction ")" exponent "$"
}

NR == 1 {
    header_nf = NF
    for (n=1; n<=NF; n++) {
        if ($n !~ number)
            header[n] = $n
        else
            header[n] = n
    }
}

NF != 0 {
    printf("\n%s: %s\n", NR, $0)
    if (NF > max_nf)
        max_nf = NF

    ### iterate over columns
    for (y=1; y<=max_nf; y++) {
        if ($y ~ number) {
            count[y] += 1
            data[y] = $y
            sum[y] += $y
            mean[y] = data[y]
            diff[y] = data[y] - data_prev[y]
            print header[y], data[y], sum[y], diff[y]
            data_prev[y] = data[y]
        }
    }
}