我需要将一个包含浮点数的numpy数组转换为字符串(以便存储在SQL数据库中),然后再将同一字符串转换回numpy浮点数数组。
以下是我根据这篇文章的方法将其转换为字符串:
VIstring = ''.join(['%.5f,' % num for num in VI])
VIstring= VIstring[:-1] #Get rid of the last comma
首先,这种方法确实有效,但是有更好的方法来消除最后的逗号吗?或者我可以让 join
方法为我插入逗号吗?
其次,更重要的是,有没有聪明的方法从字符串恢复到浮点数数组?
下面是数组和字符串的示例:
VI
array([ 17.95024446, 17.51670904, 17.08894626, 16.66695611,
16.25073861, 15.84029374, 15.4356215 , 15.0367219 ,
14.64359494, 14.25624062, 13.87465893, 13.49884988,
13.12881346, 12.76454968, 12.40605854, 12.00293814,
11.96379322, 11.96272486, 11.96142533, 11.96010489,
11.95881595, 12.26924591, 12.67548634, 13.08158864,
13.4877041 , 13.87701221, 14.40238245, 14.94943786,
15.49364166, 16.03681428, 16.5498035 , 16.78362298,
16.90331119, 17.02299387, 17.12193689, 17.09448654,
17.00066063, 16.9300633 , 16.97229868, 17.2169709 , 17.75368411])
VIstring
'17.95024,17.51671,17.08895,16.66696,16.25074,15.84029,15.43562,15.03672,14.64359,14.25624,13.87466,13.49885,13.12881,12.76455,12.40606,12.00294,11.96379,11.96272,11.96143,11.96010,11.95882,12.26925,12.67549,13.08159,13.48770,13.87701,14.40238,14.94944,15.49364,16.03681,16.54980,16.78362,16.90331,17.02299,17.12194,17.09449,17.00066,16.93006,16.97230,17.21697,17.75368'
没错,%.5f
的精度损失完全没关系,因为这些值只是由原始点进行插值得到的,而原始点只有4位小数精度,所以我不需要超过这个精度。因此,在恢复 numpy 数组时,我很高兴只获得 5 位小数精度(显然我认为如此)。