douxiong1994 2016-05-06 18:21
浏览 144
已采纳

如何将接口数组转换为float

bound :=  []interface{}{1.00, 1.00, 1.00, 1.00}
new_bound := bound.([]float32)
log.Println(new_bound)

How convert array of interface to array of float?

invalid type assertion: bound.([]float32) (non-interface type []interface {} on left)

And in real project

panic: interface conversion: interface is []interface {}, not []float32

  • 写回答

2条回答 默认 最新

  • dsbiw2911188 2016-05-06 18:27
    关注

    In your example you have a slice where each item it contains is an interface{} rather than say, a single interface{} representing a []float32, for this reason you can't convert the whole collection so simply like that. Instead you have to iterate it and do a type assertion on each item in the collection. Here's an example; https://play.golang.org/p/dD4161xgaV

    bound :=  []interface{}{1.00, 1.00, 1.00, 1.00}
    new_bound := []float64{}
    for _, v := range bound {
         new_bound = append(new_bound, v.(float64))
    }
    

    One other thing to note, those literals have their type implied and it's float64 so you actually need that here.

    EDIT: Including this more optimized solution posted by OneOfOne;

    func main() {
        bound := []interface{}{1.00, 1.10, 1.11, 1.111}
        new_bound := make([]float64, len(bound))
        for i := range bound {
            new_bound[i] = bound[i].(float64)
        }
        fmt.Println(new_bound)
    
    }
    
    本回答被题主选为最佳回答 , 对您是否有帮助呢?
    评论
查看更多回答(1条)

报告相同问题?

悬赏问题

  • ¥15 求差集那个函数有问题,有无佬可以解决
  • ¥15 【提问】基于Invest的水源涵养
  • ¥20 微信网友居然可以通过vx号找到我绑的手机号
  • ¥15 寻一个支付宝扫码远程授权登录的软件助手app
  • ¥15 解riccati方程组
  • ¥15 display:none;样式在嵌套结构中的已设置了display样式的元素上不起作用?
  • ¥15 使用rabbitMQ 消息队列作为url源进行多线程爬取时,总有几个url没有处理的问题。
  • ¥15 Ubuntu在安装序列比对软件STAR时出现报错如何解决
  • ¥50 树莓派安卓APK系统签名
  • ¥65 汇编语言除法溢出问题