各位大虾，

本人是新手，以前接触过MATLAB，向大家求助一段程序的理解，标注红色的部分怎么理解？training_data的格式：{0 or 1, [x1 x2
x3 ......] }

for后面跟两项是什么意思？


def makeBalls(training_data, distance_function, epsilon = 1):

    balls = []

    # loop through center points
    for (is_positive, center_datapoint ) in training_data:

        # loop through edge points
        for (edge_is_positive, edge_datapoint) in training_data:

            if (not edge_is_positive):

                continue

            radius = distance_function(center_datapoint, edge_datapoint)

            #if (radius==0):
            #    continue # skip over 0-radius balls (TODO: this could be
optimized)

            if (is_positive):
                new_ball = ddBall(is_positive, center_datapoint,
radius+epsilon, distance_function)
            else:
                new_ball = ddBall(is_positive, center_datapoint,
radius-epsilon, distance_function)
            balls.append ( new_ball )

    return balls

-- 
XunKai Wei
IEEE Member
Air Force Engineering University
Xi'an, China
Email:xunkai.wei at gmail.com
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training_dataÀïÃæÊǶþÔª×éÁÐ±í¡£Äã¿ÉÒÔÏëÏó³É((x1,y1),(x2,y2)....)ÕâÑùµÄ£¬Ã¿´Îfor¶¼°Ñx1ºÍx2Ò»ÆðÈ¡³öÀ´¡£




gaohawk
2007-10-31



·¢¼þÈË£º xunkai wei
·¢ËÍʱ¼ä£º 2007-10-31 21:35:54
ÊÕ¼þÈË£º python-chinese在lists.python.cn
³­ËÍ£º 
Ö÷Ì⣺ [python-chinese] Help

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±¾ÈËÊÇÐÂÊÖ£¬ÒÔÇ°½Ó´¥¹ýMATLAB£¬Ïò´ó¼ÒÇóÖúÒ»¶Î³ÌÐòµÄÀí½â£¬±ê×¢ºìÉ«µÄ²¿·ÖÔõôÀí½â£¿training_dataµÄ¸ñʽ£º{0 or 1, [x1 x2 x3 ......] }

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def makeBalls(training_data, distance_function, epsilon = 1): 

    balls = []
    
    # loop through center points 
    for (is_positive, center_datapoint ) in training_data:
            
        # loop through edge points
        for (edge_is_positive, edge_datapoint) in training_data:
        
            if (not edge_is_positive):

                continue 
                
            radius = distance_function(center_datapoint, edge_datapoint)
                            
            #if (radius==0):
            #    continue # skip over 0-radius balls (TODO: this could be optimized) 
                
            if (is_positive):    
                new_ball = ddBall(is_positive, center_datapoint, radius+epsilon, distance_function)
            else: 
                new_ball = ddBall(is_positive, center_datapoint, radius-epsilon, distance_function)
            balls.append ( new_ball )
            
    return balls

-- 
XunKai Wei
IEEE Member
Air Force Engineering University
Xi'an, China
Email:xunkai.wei在gmail.com 
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 哈哈，茅塞顿开啊，谢谢您的热心帮助！
相当于每次一个元组，而这个元组包含两项是吗？我查半天没有见过这种格式，非常感谢！

询楷

On 10/31/07, gaohawk <gaohawk at gmail.com> wrote:
>
>  training_data里面是二元组列表。你可以想象成((x1,y1),(x2,y2)....)这样的，每次for都把x1和x2一起取出来。
>
>  ------------------------------
>  gaohawk
> 2007-10-31
>  ------------------------------
>  *发件人：* xunkai wei
> *发送时间：* 2007-10-31 21:35:54
> *收件人：* python-chinese at lists.python.cn
> *抄送：*
> *主题：* [python-chinese] Help
>
> 各位大虾，
>
> 本人是新手，以前接触过MATLAB，向大家求助一段程序的理解，标注红色的部分怎么理解？training_data的格式：{0 or 1, [x1
> x2 x3 ......] }
>
> for后面跟两项是什么意思？
>
>
> def makeBalls(training_data, distance_function, epsilon = 1):
>
>     balls = []
>
>     # loop through center points
>     for (is_positive, center_datapoint ) in training_data:
>
>         # loop through edge points
>         for (edge_is_positive, edge_datapoint) in training_data:
>
>             if (not edge_is_positive):
>
>                 continue
>
>             radius = distance_function(center_datapoint, edge_datapoint)
>
>             #if (radius==0):
>             #    continue # skip over 0-radius balls (TODO: this could be
> optimized)
>
>             if (is_positive):
>                 new_ball = ddBall(is_positive, center_datapoint,
> radius+epsilon, distance_function)
>             else:
>                 new_ball = ddBall(is_positive, center_datapoint,
> radius-epsilon, distance_function)
>             balls.append ( new_ball )
>
>     return balls
>
> --
> XunKai Wei
> IEEE Member
> Air Force Engineering University
> Xi'an, China
> Email:xunkai.wei at gmail.com
>
> _______________________________________________
> python-chinese
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>



-- 
XunKai Wei
IEEE Member
Air Force Engineering University
Xi'an, China
Email:xunkai.wei at gmail.com
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